Disc Brake System Cadillac ELR I

Fastener Tightening Specifications

Fastener Tightening Specifications

Disc Brake Component Specifications

Disc Brake Component Specifications

Adhesives, Fluids, Lubricants, and Sealers

Adhesives, Fluids, Lubricants, and Sealers

Brake Rotor Thickness Measurement

1. If the inboard friction surface of the brake rotor is not accessible, reposition and support the caliper with the brake pads. Refer to «Front Disc Brake Pads Replacement»(/cadillac/elr/i-2013-2015/remont/mechanical-hydraulic/#disc-brake-system) , and/or «Rear Disc Brake Pads Replacement»(/cadillac/elr/i-2013-2015/remont/mechanical-hydraulic/#disc-brake-system) .
2. Clean the friction surfaces of the brake rotor with denatured alcohol, or an equivalent approved brake cleaner.
3. Using a micrometer (1) calibrated in thousanths-of-a-millimeter, or ten-thousanths-of-an-inch, measure and record the thickness of the brake rotor at four or more points, evenly spaced around the rotor. Ensure that the measurements are only taken within the friction surfaces and that the micrometer is positioned the same distance from the outer edge of the rotor, about 13 mm ( 1/2 in), for each measurement.
4. Compare the lowest thickness measurement recorded specifications. Refer to «Disc Brake Component Specifications»(/cadillac/elr/i-2013-2015/remont/mechanical-hydraulic/#disc-brake-system__disc-brake-component-specifications) .
5. If the lowest thickness measurement of the brake rotor is above the minimum allowable thickness after refinishing specification, the rotor may be able to be refinished, depending upon surface and wear conditions which may be present.
6. If the lowest thickness measurement of the brake rotor is at or below the minimum allowable thickness after refinishing specification, the rotor may not be refinished.
7. If the lowest thickness measurement of the brake rotor is at or below the discard thickness specification, the rotor requires replacement.

Brake Rotor Thickness Variation Measurement

Note. Any disc brake rotor that exhibits thickness variation exceeding the maximum acceptable level must be refinished or replaced. Thickness variation exceeding the maximum acceptable level can cause brake pulsation.

1. If the inboard friction surface of the brake rotor is not accessible, reposition and support the caliper with the brake pads. Refer to «Front Disc Brake Pads Replacement»(/cadillac/elr/i-2013-2015/remont/mechanical-hydraulic/#disc-brake-system) , and/or «Rear Disc Brake Pads Replacement»(/cadillac/elr/i-2013-2015/remont/mechanical-hydraulic/#disc-brake-system) .
2. Clean the friction surfaces of the brake rotor with denatured alcohol, or an equivalent approved brake cleaner.
3. Using a micrometer (1) calibrated in thousandths-of-a-millimeter, or ten-thousandths-of-an-inch, measure and record the thickness of the brake rotor at 4 or more points, evenly spaced around the rotor. Ensure that the measurements are only taken within the friction surfaces and that the micrometer is positioned the same distance from the outer edge of the rotor, about 13 mm ( 1/2 in), for each measurement.
4. Calculate the difference between the highest and lowest thickness measurements recorded to obtain the amount of thickness variation.
5. Compare the thickness variation measurement to the following specification: Specification Brake rotor maximum allowable thickness variation: 0.025 mm (0.001 in)
6. If the brake rotor thickness variation measurement exceeds the specification, the rotor requires refinishing or replacement.

Brake Rotor Surface and Wear Inspection

1. If the inboard friction surface of the brake rotor is not accessible, reposition and support the caliper with the brake pads. Refer to «Front Disc Brake Pads Replacement»(/cadillac/elr/i-2013-2015/remont/mechanical-hydraulic/#disc-brake-system) , and/or «Rear Disc Brake Pads Replacement»(/cadillac/elr/i-2013-2015/remont/mechanical-hydraulic/#disc-brake-system) .
2. Clean the friction surfaces of the brake rotor with denatured alcohol, or an equivalent approved brake cleaner.
3. Inspect the friction surfaces of the brake rotor for the following Braking Surface Conditions: Heavy rust and/or pitting Light surface rust can be removed with an abrasive disc. Heavy surface rust and/or pitting must be removed by refinishing the rotor. Cracks and/or heat spots Excessive blueing discoloration
4. If the friction surfaces of the brake rotor exhibit one or more of the Braking Surface Conditions, the rotor requires refinishing or replacement.
5. Using a micrometer (1) calibrated in thousandths-of-a-millimeter, or ten-thousandths-of-an-inch, measure and record the scoring depth of any grooves present on the rotor friction surfaces.
6. Compare the groove scoring depth recorded to the following specification: Specification Brake rotor maximum allowable scoring: 1.50 mm (0.059 in)
7. If the brake rotor scoring depth exceeds the specification, or if an excessive amount of scoring is present, the rotor requires refinishing or replacement.

Brake Rotor Assembled Lateral Runout Measurement

Special Tools

1. CH-41013 Rotor Resurfacing Kit
2. CH-42450-A Wheel Hub Resurfacing Kit
3. CH-45101 Hub and Wheel Runout Gauge
4. CH-45101-100 Conical Brake Rotor Washers

For equivalent regional tools, refer to Special Tools .

Note. Brake rotor assembled lateral runout (LRO) exceeding the maximum allowable specification can cause thickness variation to develop in the brake rotor over time, usually between 4,800-11,300 km (3,000-7,000 mi). Brake rotor thickness variation MUST be checked BEFORE checking for assembled lateral runout (LRO). Thickness variation exceeding the maximum acceptable level can cause brake pulsation. Refer to Brake Rotor Thickness Variation Measurement .

1. Matchmark the position of the brake rotor to the wheel studs if this has not been done already.
2. Inspect the mating surface of the hub/axle flange and the brake rotor to ensure that there are no foreign particles, corrosion, rust, or debris remaining. If the wheel hub/axle flange and/or if the brake rotor mating surfaces exhibit these conditions, perform the following steps: Remove the brake rotor from the vehicle. Refer to «Front Brake Rotor Replacement»(/cadillac/elr/i-2013-2015/remont/mechanical-hydraulic/#disc-brake-system__front-brake-rotor-replacement) , and/or «Rear Brake Rotor Replacement»(/cadillac/elr/i-2013-2015/remont/mechanical-hydraulic/#disc-brake-system__rear-brake-rotor-replacement) . Using the CH-42450-A wheel hub resurfacing kit , thoroughly clean any rust or corrosion from the mating surface of the hub/axle flange. Using the CH-41013 rotor resurfacing kit , thoroughly clean any rust or corrosion from the mating surface of the brake rotor. Clean the friction surfaces of the brake rotor with denatured alcohol, or an equivalent approved brake cleaner.
3. Install the rotor to the hub/axle flange using the matchmark made prior to removal.
4. Hold the rotor firmly in place against the hub/axle flange and install one of th CH-45101-100 conical brake rotor washers (1), and one lug nut (2) onto the upper-most wheel stud.
5. Continue to hold the rotor secure and tighten the lug nut firmly by hand.
6. Install the remaining CH-45101-100 conical brake rotor washers and lug nuts onto the wheel studs and tighten the nuts firmly by hand in a star-pattern.
7. Tighten the lug nuts in a star-pattern to specification. Refer to «Tire and Wheel Removal and Installation»(/cadillac/elr/i-2013-2015/remont/wheel-tire-system/#tires-and-wheels__tire-and-wheel-removal-and-installation) .
8. If the brake rotor has been REFINISHED or REPLACED with a new rotor, proceed to step 14.
9. If the brake rotor meets the following criteria, proceed to step 10. The rotor is within specifications and is being REUSED. The rotor has NOT been refinished. The rotor does NOT exhibit thickness variation exceeding the maximum allowable level.
10. Mount a dial indicator, CH-45101 hub and wheel runout gauge , or equivalent, to the steering knuckle and position the indicator button so it contacts the brake rotor friction surface at a 90 degree angle, approximately 13 mm (0.5 in) from the outer edge of the rotor.
11. Measure and record the assembled LRO of the brake rotor. Rotate the rotor until the lowest reading is displayed on the indicator dial, then set the dial to zero. Rotate the rotor until the highest reading is displayed on the dial. Mark the location of the high spot relative to the nearest wheel stud, or studs. Measure and record the amount of LRO.
12. Compare the brake rotor assembled LRO to the following specification: Specification Front brake rotor maximum allowable assembled lateral runout: 0.05 mm (0.002 in) Rear brake rotor maximum allowable assembled lateral runout: 0.05 mm (0.002 in)
13. If the brake rotor assembled LRO is within specifications, proceed to step 18. If the brake rotor assembled LRO exceeds the specification, refinish the rotor to ensure true parallelism. Refer to «Brake Rotor Refinishing»(/cadillac/elr/i-2013-2015/remont/mechanical-hydraulic/#disc-brake-system__brake-rotor-refinishing) . After refinishing the rotor, proceed to step 14.
14. Mount a dial indicator, CH-45101 hub and wheel runout gauge , or equivalent, to the steering knuckle and position the indicator button so it contacts the brake rotor friction surface at a 90 degree angle, approximately 13 mm (0.5 in) from the outer edge of the rotor.
15. Measure and record the assembled LRO of the brake rotor. Rotate the rotor until the lowest reading is displayed on the indicator dial, then set the dial to zero. Rotate the rotor until the highest reading is displayed on the dial. Mark the location of the high spot relative to the nearest wheel stud, or studs. Measure and record the amount of LRO.
16. Compare the brake rotor assembled LRO to the following specification: Specification Front brake rotor maximum allowable assembled lateral runout: 0.05 mm (0.002 in) Rear brake rotor maximum allowable assembled lateral runout: 0.05 mm (0.002 in)
17. If the brake rotor assembled LRO measurement exceeds the specification, bring the LRO to within specifications. Refer to «Brake Rotor Assembled Lateral Runout Correction»(/cadillac/elr/i-2013-2015/remont/mechanical-hydraulic/#disc-brake-system__brake-rotor-assembled-lateral-runout-correction) .
18. If the brake rotor assembled LRO measurement is within specification, install the brake caliper and depress the brake pedal several times to secure the rotor in place before removing the CH-45101-100 conical brake rotor washers and the lug nuts.

Brake Pad Inspection

1. Inspect the disc brake pads at regular intervals, or whenever the tire and wheel assemblies are removed from the vehicle.
2. If replacement is necessary, always replace disc brake pads in axle sets.
3. Inspect both edges of the disc brake pad friction surfaces (3). The highest rate of wear normally occurs at the trailing edge of the disc brake pads.
4. Inspect the thickness of the disc brake pads (3) in order to ensure that they have not worn prematurely. The disc brake pad wear should be approximately even per axle set.
5. Both front and rear disc brake pads have integral, audible wear sensors (1). When the disc brake pad wear reaches the minimum allowable thickness, the wear sensor contacts the disc brake rotor (2). The wear indicator will then produce an audible, high-pitched warning noise during wheel rotation.
6. Replace the disc brake pads when the friction surface (3) is worn to within 0.76 mm (0.030 in) of the mounting plates.
7. Remove the brake calipers and inspect the friction surfaces of the inner and outer disc brake pads to ensure that they are level. Place the disc brake pad friction surfaces together and measure the gap between the surfaces. If more than 0.13 mm (0.005 in) gap exists midway between the length of the disc brake pads, replace the disc brake pads.
8. Verify that any disc brake pad shims that may be required are in place and not damaged or excessively corroded. Replace any missing or damaged shims in order to preserve proper disc brake performance.
9. Replace the disc brake pads if any have separated from the mounting plates.
10. Inspect the disc brake pads friction surfaces for cracks, fractures, or damage which may cause noise or otherwise impair disc brake performance.

Brake Caliper Inspection

1. Inspect the brake caliper housing (1) for cracks, excess wear, and/or damage. If any of these conditions are present, the brake caliper requires replacement.
2. Inspect the caliper piston dust boot seal (2) for cracks, tears, cuts, deterioration and/or improper seating in the caliper body. If any of these conditions are present, the brake caliper requires overhaul or replacement.
3. Inspect for brake fluid leakage around the caliper piston dust boot seal (2) and on the disc brake pads. If there is any evidence of brake fluid leakage, the brake caliper requires overhaul or replacement.
4. Inspect for smooth and complete travel of the caliper pistons into the caliper bores: The movement of the caliper pistons into the caliper bores should be smooth and even. If the caliper piston is frozen or difficult to bottom, the caliper requires overhaul or replacement. For single piston caliper applications, insert a discarded inner brake pad (2) or block of wood in front of the piston. Using a large C-clamp (1) installed over the body of the caliper (3) and against the brake pad or block of wood, slowly bottom the piston in the bore. For dual piston caliper applications, insert a discarded inner brake pad (2) or block of wood in front of the pistons. Using 2 large C-clamps (1) installed over the body of the caliper (3) and against the brake pad or block of wood, slowly bottom the pistons evenly into the bores.

Front Disc Brake Mounting and Hardware Inspection

1. Inspect the fluid level in the brake master cylinder reservoir.
2. If the brake fluid level is midway between the maximum-full point and the minimum allowable level then no brake fluid needs to be removed from the reservoir before proceeding.
3. If the brake fluid level is higher than midway between the maximum-full point and the minimum allowable level then remove brake fluid to the midway point before proceeding.
4. Raise and support the vehicle. Refer «Lifting and Jacking the Vehicle»(/cadillac/elr/i-2013-2015/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) .
5. Remove the tire and wheel assembly. Refer to «Tire and Wheel Removal and Installation»(/cadillac/elr/i-2013-2015/remont/wheel-tire-system/#tires-and-wheels__tire-and-wheel-removal-and-installation) .
6. Grasp the brake caliper housing and try to move the brake caliper housing up/down and forward/reverse in relation to the brake caliper mounting bracket. If excessive looseness is observed the brake caliper bracket bushings and/or the brake caliper mounting bolts may need to be replaced.
7. Compress the front caliper pistons. Install a large C-clamp over the top of the caliper housing and against the back of the outboard pad. Slowly tighten the C-clamp until the pistons are pushed completely into the caliper bores. Remove the C-clamp from the caliper.
8. With the pistons compressed into the caliper bores, grasp the brake caliper housing and slide it back and forth on the brake caliper mounting bolts. Check for smooth operation. If the brake caliper housing slide force is high or the brake caliper housing does not slide smoothly, inspect the brake caliper mounting bolts and/or the brake caliper mounting bracket bushings for wear or damage. If wear or damage conditions are found, replacement of the brake caliper mounting bolts and/or the brake caliper mounting bracket bushings is necessary.
9. Remove the brake caliper mounting bolts from the brake caliper mounting bracket and support the brake caliper using heavy mechanics wire. Do Not remove the hydraulic brake hose from the caliper. Refer to «Front Brake Caliper Replacement»(/cadillac/elr/i-2013-2015/remont/mechanical-hydraulic/#disc-brake-system) .
10. Remove the disc brake pads from the brake caliper mounting bracket.
11. Inspect the disc brake pad mounting hardware for the following: Missing mounting hardware Excessive corrosion Bent mounting tabs Looseness at the brake caliper mounting bracket Looseness at the disc brake pads Excessive contaminants in the brake caliper mounting bracket surface and threads.
12. If any of the conditions listed are found, the disc brake pad mounting hardware requires replacement.
13. Ensure the disc brake pads are held firmly in place on the brake caliper mounting bracket, yet slide easily on the mounting hardware without binding.
14. Inspect the caliper bolts (1) for the following: Binding Seizing Looseness in the brake caliper mounting bracket (3) Bent or damaged brake caliper mounting bolts Cracked or torn boots (4) Missing boots Bent or damaged brake caliper mounting bracket (3)
15. If any of the conditions listed are found then the brake caliper mounting hardware requires replacement.
16. Install the disc brake pads to the brake caliper mounting bracket.
17. Install the disc brake caliper to the brake caliper mounting bracket. Refer to «Front Brake Caliper Replacement»(/cadillac/elr/i-2013-2015/remont/mechanical-hydraulic/#disc-brake-system) .

Rear Disc Brake Mounting and Hardware Inspection

1. Inspect the fluid level in the brake master cylinder reservoir.
2. If the brake fluid level is midway between the maximum-full point and the minimum allowable level then no brake fluid needs to be removed from the reservoir before proceeding.
3. If the brake fluid level is higher than midway between the maximum-full point and the minimum allowable level then remove brake fluid to the midway point before proceeding.
4. Raise and support the vehicle. Refer «Lifting and Jacking the Vehicle»(/cadillac/elr/i-2013-2015/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) .
5. Remove the tire and wheel assembly. Refer to «Tire and Wheel Removal and Installation»(/cadillac/elr/i-2013-2015/remont/wheel-tire-system/#tires-and-wheels__tire-and-wheel-removal-and-installation) .
6. Grasp the brake caliper housing and try to move the brake caliper housing up/down and forward/reverse in relation to the brake caliper mounting bracket. If excessive looseness is observed the brake caliper bracket bushings and/or the brake caliper mounting bolts may need to be replaced.
7. Compress the rear caliper piston. Install a large C-clamp over the top of the caliper housing and against the back of the outboard pad. Slowly tighten the C-clamp until the piston is pushed completely into the caliper bores. Remove the C-clamp from the caliper.
8. With the piston compressed into the caliper bore, grasp the brake caliper housing and slide it back and forth on the brake caliper mounting bolts. Check for smooth operation. If the brake caliper housing slide force is high or the brake caliper housing does not slide smoothly, inspect the brake caliper mounting bolts and/or the brake caliper mounting bracket bushings for wear or damage. If wear or damage conditions are found, replacement of the brake caliper mounting bolts and/or the brake caliper mounting bracket bushings is necessary.
9. Remove the brake caliper mounting bolts from the brake caliper mounting bracket and support the brake caliper using heavy mechanics wire. Do not disconnect the hydraulic brake hose from the caliper. Refer to «Rear Brake Caliper Replacement»(/cadillac/elr/i-2013-2015/remont/mechanical-hydraulic/#disc-brake-system) .
10. Remove the disc brake pads from the brake caliper mounting bracket.
11. Inspect the disc brake pad mounting hardware for the following: Missing mounting hardware Excessive corrosion Bent mounting tabs Looseness at the brake caliper mounting bracket Looseness at the disc brake pads Excessive contaminants in the brake caliper mounting bracket surface and threads.
12. If any of the conditions listed are found, the disc brake pad mounting hardware requires replacement.
13. Ensure the disc brake pads are held firmly in place on the brake caliper mounting bracket, yet slide easily on the mounting hardware without binding.
14. Inspect the caliper bolts (1) for the following: Binding Seizing Looseness in the brake caliper mounting bracket (3) Bent or damaged brake caliper mounting bolts Cracked or torn boots (4) Missing boots Bent or damaged brake caliper mounting bracket (3)
15. If any of the conditions listed are found then the brake caliper mounting hardware requires replacement.
16. Install the disc brake pads to the brake caliper mounting bracket.
17. Install the disc brake caliper to the brake caliper mounting bracket. Refer to «Rear Brake Caliper Replacement»(/cadillac/elr/i-2013-2015/remont/mechanical-hydraulic/#disc-brake-system) .

Removal Procedure

Note. Always replace disc brake pads in axle sets.

1. Inspect the fluid level in the brake master cylinder reservoir.
2. If the brake fluid level is midway between the maximum-full point and the minimum allowable level, no brake fluid needs to be removed before proceeding.
3. If the brake fluid level is higher than midway between the maximum-full point and the minimum allowable level, remove brake fluid to the midway point before proceeding.
4. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/elr/i-2013-2015/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) .
5. Remove the tire and wheel assembly. Refer to «Tire and Wheel Removal and Installation»(/cadillac/elr/i-2013-2015/remont/wheel-tire-system/#tires-and-wheels__tire-and-wheel-removal-and-installation) .
6. Place a large C-clamp over the brake caliper body and against the outer brake pad.
7. Using the C-clamp, compress the brake caliper piston fully into the brake caliper bore.
8. Using a backup wrench to hold the brake caliper guide pin stationary, remove the lower brake caliper guide pin bolt (1).
9. Rotate the brake caliper upward and support with heavy mechanics wire or equivalent.
10. Remove the inner brake pad (1).
11. Remove the outer brake pad (2).
12. Remove the upper and lower brake pad springs (1).
13. If installing new brake pads, discard the brake pad springs.

Installation Procedure

1. Thoroughly clean the contact surfaces of the brake caliper bracket of any corrosion or debris.
2. Install the upper and lower brake pad springs (1).
3. Install the inner brake pad (1).
4. Install the outer brake pad (2).
5. Position the brake caliper over the brake pads and to the caliper bracket.
6. Using a backup wrench to hold the brake caliper guide pin stationary, install the lower brake caliper guide pin bolt (1) and tighten to 28 N.m (21 lb ft).
7. Install the tire and wheel assembly. Refer to «Tire and Wheel Removal and Installation»(/cadillac/elr/i-2013-2015/remont/wheel-tire-system/#tires-and-wheels__tire-and-wheel-removal-and-installation) .
8. With the engine OFF, gradually apply the brake pedal to approximately 2/3 of its travel distance.
9. Slowly release the brake pedal.
10. Wait 15 seconds, then repeat steps 8-9 until a firm brake pedal is obtained. This will properly seat the brake caliper piston and brake pads.
11. Fill the master cylinder reservoir. Refer to «Master Cylinder Reservoir Filling»(/cadillac/elr/i-2013-2015/remont/mechanical-hydraulic/#hydraulic-brake-system__master-cylinder-reservoir-filling) .
12. Burnish the brake pads and rotors. Refer to «Brake Pad and Rotor Burnishing»(/cadillac/elr/i-2013-2015/remont/mechanical-hydraulic/#disc-brake-system__brake-pad-and-rotor-burnishing) .

Note. Always replace disc brake pads in axle sets.

1. Inspect the fluid level in the brake master cylinder reservoir.
2. If the brake fluid level is midway between the maximum-full point and the minimum allowable level, no brake fluid needs to be removed before proceeding.
3. If the brake fluid level is higher than midway between the maximum-full point and the minimum allowable level, remove brake fluid to the midway point before proceeding.
4. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/elr/i-2013-2015/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) .
5. Remove the tire and wheel assembly. Refer to «Tire and Wheel Removal and Installation»(/cadillac/elr/i-2013-2015/remont/wheel-tire-system/#tires-and-wheels__tire-and-wheel-removal-and-installation) .
6. Using a backup wrench to hold the brake caliper guide pin stationary, remove the lower brake caliper guide pin bolt (1).
7. Unclip the parking brake cable from the body allowing the brake caliper to pivot unrestricted.
8. Rotate the brake caliper upward and support with heavy mechanics wire or equivalent.
9. Remove the outer brake pad (1).
10. Remove the inner brake pad (2).
11. Remove the upper and lower brake pad springs (1).
12. If installing new brake pads, discard the brake pad springs.

1. Using a brake caliper piston spanner tool, rotate the brake caliper piston clockwise while applying pressure to the face of the caliper piston to compress the piston into the caliper bore.
2. Thoroughly clean the contact surfaces of the brake caliper bracket of any corrosion or debris.
3. Install the upper and lower brake pad springs (1).
4. Install the outer brake pad (1).
5. Install the inner brake pad (2).
6. Position the brake caliper over the brake pads and to the caliper bracket.
7. Secure the parking brake cable to the body.
8. Using a backup wrench to hold the brake caliper guide pin stationary, Install the lower brake caliper guide pin bolt (1) and tighten to 28 (21 lb ft).
9. Install the tire and wheel assembly. Refer to «Tire and Wheel Removal and Installation»(/cadillac/elr/i-2013-2015/remont/wheel-tire-system/#tires-and-wheels__tire-and-wheel-removal-and-installation) .
10. With the engine OFF, gradually apply the brake pedal to approximately 2/3 of its travel distance.
11. Slowly release the brake pedal.
12. Wait 15 seconds, then repeat steps 10-11 until a firm brake pedal is obtained. This will properly seat the brake caliper piston and brake pads.
13. Fill the master cylinder reservoir. Refer to «Master Cylinder Reservoir Filling»(/cadillac/elr/i-2013-2015/remont/mechanical-hydraulic/#hydraulic-brake-system__master-cylinder-reservoir-filling) .
14. Burnish the brake pads and rotors. Refer to «Brake Pad and Rotor Burnishing»(/cadillac/elr/i-2013-2015/remont/mechanical-hydraulic/#disc-brake-system__brake-pad-and-rotor-burnishing) .

Brake Pad and Rotor Burnishing

Burnishing the brake pads and brake rotors is necessary in order to ensure that the braking surfaces are properly prepared after service has been performed on the disc brake system.

This procedure should be performed whenever the disc brake rotors have been refinished or replaced, and/or whenever the disc brake pads have been replaced.

1. Select a smooth road with little or no traffic.
2. Accelerate the vehicle to 48 km/h (30 mph). NOTE: Use care to avoid overheating the brakes while performing this step.
3. Using moderate to firm pressure, apply the brakes to bring the vehicle to a stop. Do not allow the brakes to lock.
4. Repeat steps 2 and 3 until approximately 20 stops have been completed. Allow sufficient cooling periods between stops in order to properly burnish the brake pads and rotors.

1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/elr/i-2013-2015/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) .
2. Remove the tire and wheel assembly. Refer to «Tire and Wheel Removal and Installation»(/cadillac/elr/i-2013-2015/remont/wheel-tire-system/#tires-and-wheels__tire-and-wheel-removal-and-installation) .
3. Remove the brake hose fitting bolt (1).
4. Remove and discard the brake hose fitting gaskets (2) from the brake hose fitting (3).
5. Cap the brake hose fitting to prevent brake fluid loss and contamination.
6. Using a backup wrench to hold the brake caliper guide pin stationary, remove the brake caliper guide pin bolts (1).
7. Remove the brake caliper.

1. Position the brake caliper over the brake pads and to the caliper bracket.
2. Using a backup wrench to hold the brake caliper guide pin stationary, install the brake caliper guide pin bolts (1) and tighten to 28 (21 lb ft).
3. Assemble the brake hose fitting bolt (1) and the 2 new brake hose fitting gaskets (2) to the brake hose fitting (3).
4. Install the brake hose assembly and tighten the brake hose fitting bolt to 40 (30 lb ft).
5. Bleed the hydraulic brake system. Refer to «Hydraulic Brake System Bleeding (Manual)»(/cadillac/elr/i-2013-2015/remont/mechanical-hydraulic/#hydraulic-brake-system) , «Hydraulic Brake System Bleeding (Pressure)»(/cadillac/elr/i-2013-2015/remont/mechanical-hydraulic/#hydraulic-brake-system) .
6. Install the tire and wheel assembly. Refer to «Tire and Wheel Removal and Installation»(/cadillac/elr/i-2013-2015/remont/wheel-tire-system/#tires-and-wheels__tire-and-wheel-removal-and-installation) .

1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/elr/i-2013-2015/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) .
2. Remove the tire and wheel assembly. Refer to «Tire and Wheel Removal and Installation»(/cadillac/elr/i-2013-2015/remont/wheel-tire-system/#tires-and-wheels__tire-and-wheel-removal-and-installation) .
3. Disable the parking brake cable adjuster. Refer to «Parking Brake Cable Adjuster Disabling»(/cadillac/elr/i-2013-2015/remont/parking-brake-system/#parking-brake-system__parking-brake-cable-adjuster-disabling) .
4. Disconnect the parking brake cable (1) from the actuator lever.
5. Compress the parking brake cable conduit retainers (2).
6. Remove the parking brake cable from the cable bracket and position the parking brake cable aside.
7. Remove the brake hose fitting bolt (1).
8. Remove and discard the brake hose fitting gaskets (2) from the brake hose (3).
9. Plug the brake hose fitting to prevent brake fluid loss and contamination.
10. Using a backup wrench to hold the brake caliper guide pin (1) stationary, remove the brake caliper guide pin bolts (2).
11. Remove the brake caliper.

1. Position the brake caliper over the brake pads and to the caliper bracket.
2. Using a backup wrench to hold the brake caliper guide pin (1) stationary, install the brake caliper guide pin bolts (2) and tighten to 28 N.m (21 lb ft).
3. Assemble the brake hose fitting bolt (1) and the 2 new brake hose fitting gaskets (2) to the brake hose (3).
4. Install the brake hose assembly to the brake caliper and tighten the fitting bolt to 40 N.m (30 lb ft).
5. Insert the parking brake cable through the parking brake cable bracket on the brake caliper.
6. Connect the parking brake cable (1) to the actuator lever and engage the parking brake cable conduit retainers (2) to the cable bracket.
7. Enable the parking brake cable adjuster. Refer to «Parking Brake Cable Adjuster Enabling»(/cadillac/elr/i-2013-2015/remont/parking-brake-system/#parking-brake-system__parking-brake-cable-adjuster-enabling) .
8. Bleed the hydraulic brake system. Refer to «Hydraulic Brake System Bleeding (Manual)»(/cadillac/elr/i-2013-2015/remont/mechanical-hydraulic/#hydraulic-brake-system) , «Hydraulic Brake System Bleeding (Pressure)»(/cadillac/elr/i-2013-2015/remont/mechanical-hydraulic/#hydraulic-brake-system) .
9. Install the tire and wheel assembly. Refer to «Tire and Wheel Removal and Installation»(/cadillac/elr/i-2013-2015/remont/wheel-tire-system/#tires-and-wheels__tire-and-wheel-removal-and-installation) .

Disassembly Procedure

1. Remove the brake caliper from the vehicle. Refer to «Front Brake Caliper Replacement»(/cadillac/elr/i-2013-2015/remont/mechanical-hydraulic/#disc-brake-system) .
2. Remove the brake caliper piston from the caliper bore by directing low pressure compressed air into the caliper (1) through the fluid inlet hole.
3. Remove the piston dust boot seal (1) from the seal counterbore in the caliper (4). Discard the boot seal.
4. Using a small wooden or plastic tool, remove the piston seal (3) from the caliper bore. Discard the piston seal.
5. Remove the bleeder valve cap (6).
6. Remove the bleeder valve (5).
7. If cracks, scoring, pitting, excessive rust, and/or excessive corrosion are present in the caliper bore, replace the caliper assembly.
8. If light rust or light corrosion are present in the caliper bore, attempt to remove the imperfection with a fine emery paper. If the imperfection cannot be removed, replace the caliper assembly.
9. Clean the brake caliper piston bore and seal counterbore, and the caliper piston with denatured alcohol, or equivalent.
10. Dry the caliper piston bore and counterbore, and the piston with non-lubricated, filtered, compressed air.
11. Inspect the caliper piston for cracks, scoring, and/or damage to the plating. Replace the caliper piston if any of these conditions exist.
12. Inspect the caliper mounting holes for cracks, scoring, pitting, rust and/or excessive corrosion. Replace the caliper assembly if any of these conditions exist.

Assembly Procedure

1. Lubricate the new piston seal (3) with brake fluid from a clean, sealed brake fluid container. Refer to «Adhesives, Fluids, Lubricants, and Sealers»(/cadillac/elr/i-2013-2015/remont/mechanical-hydraulic/#disc-brake-system__adhesives-fluids-lubricants-and-sealers) for the recommended brake fluid.
2. Install the lubricated, new piston seal into the caliper bore.
3. Install the bleeder valve (5) to the caliper and tighten the valve to 17 N.m (13 lb ft).
4. Install the bleeder valve cap (6).
5. Apply a thin coat of brake fluid from a clean, sealed brake fluid container to the brake caliper (4) bore. Refer to «Adhesives, Fluids, Lubricants, and Sealers»(/cadillac/elr/i-2013-2015/remont/mechanical-hydraulic/#disc-brake-system__adhesives-fluids-lubricants-and-sealers) for the recommended brake fluid.
6. Install the new piston dust boot seal (1) over the caliper piston.
7. Install the bottom half of the caliper piston (2) into the caliper bore.
8. Compress the caliper piston to the bottom of the caliper bore.
9. Fully seat the piston dust boot seal into caliper counterbore.
10. Install the brake caliper to the vehicle. Refer to «Front Brake Caliper Replacement»(/cadillac/elr/i-2013-2015/remont/mechanical-hydraulic/#disc-brake-system) .

Disassembly

1. Remove the rear brake caliper from vehicle. Refer to «Rear Brake Caliper Replacement»(/cadillac/elr/i-2013-2015/remont/mechanical-hydraulic/#disc-brake-system) .
2. Drain the brake fluid from the caliper assembly.
3. Firmly clamp the caliper assembly (1) in a soft-jawed vice.
4. Using a small wooden or plastic tool, carefully remove the brake caliper piston dust boot seal retaining ring from the groove in the caliper seal counterbore.
5. Carefully rotate the caliper piston (2) counter-clockwise and remove the caliper piston from the brake caliper housing.
6. Remove the brake caliper piston dust boot seal (3) from the brake caliper housing.
7. Using a small wooden or plastic tool, remove the piston seal from the caliper bore and discard the piston seal.
8. Inspect the operation of the integral park brake mechanism: Rotate the park brake lever back and forth while observing the movement of the park brake mechanism actuator assembly in the caliper bore.
9. If the integral park brake mechanism was not operating properly, binding or seized, replace the brake caliper assembly.
10. If cracks, scoring, pitting, and/or excessive corrosion are present in the caliper bore, replace the caliper assembly.
11. If light corrosion is present in the caliper bore, attempt to remove the imperfection with a fine emery paper. If the imperfection cannot be removed, replace the caliper assembly.
12. Clean the brake caliper piston bore and seal counterbore, the caliper piston, and the caliper sleeves with denatured alcohol, or equivalent.
13. Dry the caliper piston bore and counterbore, the piston, and the sleeves with non-lubricated, filtered compressed air.
14. Inspect the caliper piston for cracks, scoring, damage to the plating, and/or damage to the integral adjusting mechanism. Replace the caliper piston if any of these conditions exist.
15. Inspect the caliper mounting holes for cracks, scoring, pitting, and/or excessive corrosion. Replace the caliper assembly if any of these conditions exist.

Assembly

1. Lubricate the new piston seal with GM approved brake fluid from a clean, sealed brake fluid container. Refer to «Adhesives, Fluids, Lubricants, and Sealers»(/cadillac/elr/i-2013-2015/remont/mechanical-hydraulic/#disc-brake-system__adhesives-fluids-lubricants-and-sealers) .
2. Install the new piston seal into the caliper bore.
3. Ensure the piston seal is seated squarely into the groove in the caliper bore and is not twisted.
4. Install the new dust boot seal (1) onto the caliper piston (2).
5. With the caliper housing (1) firmly secured in a soft-jawed vise, insert the caliper piston (2) into the caliper housing.
6. Using a spanner type wrench, rotate the piston clockwise while pushing the piston into the caliper housing bore.
7. When the caliper piston is fully seated into the caliper housing, align the notches in the caliper piston face to the pins on the inboard brake pad.
8. Fully seat the piston dust boot seal (3) in the caliper counterbore.
9. Install the piston dust boot seal retaining ring to the groove in the caliper counterbore.
10. Install the brake caliper to the vehicle. Refer to «Rear Brake Caliper Replacement»(/cadillac/elr/i-2013-2015/remont/mechanical-hydraulic/#disc-brake-system) . Inspect the brake caliper for brake fluid leaks while performing the hydraulic brake system bleeding procedure after the caliper has been installed to the vehicle. If the brake caliper leaks brake fluid from the FRONT of the caliper past the piston dust boot seal, replace the caliper piston assembly. The piston integral adjustment mechanism contains a non-serviceable seal which may be allowing brake fluid to leak past it through a bleed hole near the end of the caliper piston.

1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/elr/i-2013-2015/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) .
2. Remove the rear tire and wheel assembly. Refer to «Tire and Wheel Removal and Installation»(/cadillac/elr/i-2013-2015/remont/wheel-tire-system/#tires-and-wheels__tire-and-wheel-removal-and-installation) .
3. Remove the rear brake hose bracket nut (1).
4. Remove the rear brake shield. Refer to «Rear Brake Shield Replacement»(/cadillac/elr/i-2013-2015/remont/mechanical-hydraulic/#disc-brake-system) .
5. Remove the rear brake caliper mount plate (1).

1. Install the rear brake caliper mount plate (1).
2. Install the rear brake shield. Refer to «Rear Brake Shield Replacement»(/cadillac/elr/i-2013-2015/remont/mechanical-hydraulic/#disc-brake-system) .
3. Install the rear brake hose bracket nut (1) and tighten to 7 (62 lb in).
4. Install the tire and wheel assembly. Refer to «Tire and Wheel Removal and Installation»(/cadillac/elr/i-2013-2015/remont/wheel-tire-system/#tires-and-wheels__tire-and-wheel-removal-and-installation) .

1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/elr/i-2013-2015/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) .
2. Remove the tire and wheel assembly. Refer to «Tire and Wheel Removal and Installation»(/cadillac/elr/i-2013-2015/remont/wheel-tire-system/#tires-and-wheels__tire-and-wheel-removal-and-installation) .
3. Hold the brake caliper guide pin stationary and remove the brake caliper guide pin bolts (1).
4. Remove the brake caliper and support with heavy mechanics wire or equivalent.
5. Remove the upper brake caliper guide pin (1).
6. Remove the lower brake caliper guide pin (2).
7. Remove the 2 brake caliper guide pin seals.

1. Apply a light coat of high temperature silicone brake lubricant to the brake caliper guide pins.
2. Install the 2 brake caliper guide pin seals.
3. Ensure the brake caliper guide pin seal is fully seated in the groove of the brake caliper bracket.
4. Install the upper brake caliper guide pin (1).
5. Install the lower brake caliper guide pin (2).
6. Ensure the brake caliper guide pin seal is fully seated in the groove of the brake caliper guide pins.
7. Position the brake caliper over the brake pads and to the caliper bracket.
8. Using a backup wrench to hold the brake caliper guide pin stationary, install the brake caliper guide pin bolts (1) and tighten to 28 N.m (21 lb ft).
9. Install the tire and wheel assembly. Refer to «Tire and Wheel Removal and Installation»(/cadillac/elr/i-2013-2015/remont/wheel-tire-system/#tires-and-wheels__tire-and-wheel-removal-and-installation) .

1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/elr/i-2013-2015/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) .
2. Remove the tire and wheel assembly. Refer to «Tire and Wheel Removal and Installation»(/cadillac/elr/i-2013-2015/remont/wheel-tire-system/#tires-and-wheels__tire-and-wheel-removal-and-installation) .
3. Using a backup wrench to hold the brake caliper guide pin (1) stationary, remove the brake caliper guide pin bolts (2).
4. Remove the brake caliper and support with heavy mechanics wire or equivalent.
5. Remove the upper brake caliper guide pin (1).
6. Remove the lower brake caliper guide pin (2).
7. Remove the brake caliper guide pin seals (1).

1. Install the brake caliper guide pin seals (1).
2. Ensure the brake caliper guide pin seals are fully seated in the groove of the brake caliper bracket.
3. Install the upper brake caliper guide pin (1).
4. Install the lower brake caliper guide pin (2).
5. Ensure the brake caliper guide pin seals are fully seated in the groove of the brake caliper guide pins.
6. Position the brake caliper over the brake pads and to the caliper bracket.
7. Using a backup wrench to hold the brake caliper guide pin (1) stationary, install the brake caliper guide pin bolts (2) and tighten to 28 N.m (21 lb ft).
8. Install the tire and wheel assembly. Refer to «Tire and Wheel Removal and Installation»(/cadillac/elr/i-2013-2015/remont/wheel-tire-system/#tires-and-wheels__tire-and-wheel-removal-and-installation) .

1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/elr/i-2013-2015/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) .
2. Remove the tire and wheel assembly. Refer to «Tire and Wheel Removal and Installation»(/cadillac/elr/i-2013-2015/remont/wheel-tire-system/#tires-and-wheels__tire-and-wheel-removal-and-installation) .
3. Hold the brake caliper guide pin stationary and remove the brake caliper guide pin bolts (1).
4. Remove the brake caliper and support with heavy mechanics wire or equivalent.
5. Remove the inner brake pad (1).
6. Remove the outer brake pad (2).
7. Remove the brake pad springs (1).
8. Remove the upper brake caliper guide pin (1).
9. Remove the lower brake caliper guide pin (2).
10. Remove the 2 brake caliper guide pin seals.
11. Remove the brake caliper bracket bolts (1).
12. Remove the brake caliper bracket (1).

1. Install the brake caliper bracket (1).
2. Install the brake caliper bracket bolts (1) and tighten to 150 (111 lb ft) + 15-30 degrees.
3. Install the brake pad springs (1).
4. Install the 2 brake caliper guide pin seals.
5. Ensure the brake caliper guide pin seals are fully seated in the groove of the brake caliper bracket.
6. Install the upper brake caliper guide pin (1).
7. Install the lower brake caliper guide pin (2).
8. Ensure the brake caliper guide pin seals are fully seated in the groove of the brake caliper guide pins.
9. Install the inner brake pad (1).
10. Install the outer brake pad (2).
11. Position the brake caliper over the brake pads and to the caliper bracket.
12. Using a backup wrench to hold the brake caliper guide pin stationary, install the brake caliper guide pin bolts (1) and tighten to 28 (21 lb ft).
13. Install the tire and wheel assembly. Refer to «Tire and Wheel Removal and Installation»(/cadillac/elr/i-2013-2015/remont/wheel-tire-system/#tires-and-wheels__tire-and-wheel-removal-and-installation) .

1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/elr/i-2013-2015/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) .
2. Remove the tire and wheel assembly. Refer to «Tire and Wheel Removal and Installation»(/cadillac/elr/i-2013-2015/remont/wheel-tire-system/#tires-and-wheels__tire-and-wheel-removal-and-installation) .
3. Using a backup wrench to hold the brake caliper guide pin (1) stationary, remove the brake caliper guide pin bolts (2).
4. Remove the brake caliper and support with heavy mechanics wire or equivalent.
5. Remove the outer brake pad (1).
6. Remove the inner brake pad (2).
7. Remove the brake pad springs (1).
8. Remove the upper brake caliper guide pin (1).
9. Remove the lower brake caliper guide pin (2).
10. Remove the brake caliper guide pin seals (1).
11. Remove the brake caliper bracket bolts (1).
12. Remove the brake caliper bracket (1).

1. Install the brake caliper bracket (1).
2. Install the brake caliper bracket bolts (1) and tighten to 100 (74 lb ft) + 15-30 degrees.
3. Install the brake caliper guide pin seals (1).
4. Ensure the brake caliper guide pin seals are fully seated in the groove of the brake caliper bracket.
5. Install the upper brake caliper guide pin (1).
6. Install the lower brake caliper guide pin (2).
7. Ensure the brake caliper guide pin seals are fully seated in the groove of the brake caliper guide pins.
8. Install the brake pad springs (1).
9. Install the outer brake pad (1).
10. Install the inner brake pad (2).
11. Position the brake caliper over the brake pads and to the caliper bracket.
12. Using a backup wrench to hold the brake caliper guide pin (1) stationary, install the brake caliper guide pin bolts (2) and tighten to 28 (21 lb ft).
13. Install the tire and wheel assembly. Refer to «Tire and Wheel Removal and Installation»(/cadillac/elr/i-2013-2015/remont/wheel-tire-system/#tires-and-wheels__tire-and-wheel-removal-and-installation) .

Front Brake Rotor Replacement

Special Tools

1. CH-41013 Rotor Resurfacing Kit
2. CH-42450-A Wheel Hub Resurfacing Kit

For equivalent regional tools, refer to Special Tools .

1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/elr/i-2013-2015/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) .
2. Remove the tire and wheel assembly. Refer to «Tire and Wheel Removal and Installation»(/cadillac/elr/i-2013-2015/remont/wheel-tire-system/#tires-and-wheels__tire-and-wheel-removal-and-installation) .
3. Remove the brake caliper bracket bolts (1).
4. Remove the brake caliper and bracket as an assembly and support with heavy mechanics wire or equivalent.
5. Remove the brake rotor bolt (1).
6. Remove the brake rotor (1).

1. If installing a new brake rotor, clean the friction surfaces of the brake rotor with denatured alcohol or equivalent.
2. Using the CH-42450-A Wheel Hub Resurfacing Kit , thoroughly clean any rust or corrosion from the mating surface of the hub/axle flange.
3. Using the CH-41013 Rotor Resurfacing Kit , thoroughly clean any rust or corrosion from the mating surface of the rotor to the hub/axle flange.
4. Install the brake rotor (1).
5. Install the brake rotor bolt (1) and tighten to 9 (80 lb in).
6. Position the brake caliper and bracket assembly over the brake rotor and to the steering knuckle.
7. Install the brake caliper bracket bolts (1) and tighten to 150 (111 lb ft) + 15-30 degrees.
8. Install the tire and wheel assembly. Refer to «Tire and Wheel Removal and Installation»(/cadillac/elr/i-2013-2015/remont/wheel-tire-system/#tires-and-wheels__tire-and-wheel-removal-and-installation) .
9. Burnish the brake pads and rotors. Refer to «Brake Pad and Rotor Burnishing»(/cadillac/elr/i-2013-2015/remont/mechanical-hydraulic/#disc-brake-system__brake-pad-and-rotor-burnishing) .

Rear Brake Rotor Replacement

Special Tools

1. CH-41013 Rotor Resurfacing Kit
2. CH-42450-A Wheel Hub Resurfacing Kit

For equivalent regional tools, refer to Special Tools .

1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/elr/i-2013-2015/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) .
2. Remove the tire and wheel assembly. Refer to «Tire and Wheel Removal and Installation»(/cadillac/elr/i-2013-2015/remont/wheel-tire-system/#tires-and-wheels__tire-and-wheel-removal-and-installation) .
3. Remove the brake caliper bracket bolts (1).
4. Remove the brake caliper and bracket as an assembly and support with heavy mechanics wire or equivalent.
5. Remove the brake rotor bolt (1).
6. Remove the brake rotor (1).

1. If installing a new brake rotor, clean the friction surfaces of the brake rotor with denatured alcohol or equivalent.
2. Using the CH-42450-A Wheel Hub Resurfacing Kit , thoroughly clean any rust or corrosion from the mating surface of the hub/axle flange.
3. Using the CH-41013 Rotor Resurfacing Kit , thoroughly clean any rust or corrosion from the mating surface of the rotor to the hub/axle flange.
4. Install the brake rotor (1).
5. Install the brake rotor bolt (1) and tighten to 9 (80 lb in).
6. Position the brake caliper and bracket assembly over the brake rotor and to the suspension knuckle.
7. Install the brake caliper bracket bolts (1) and tighten to 100 (74 lb ft) + 15-30 degrees.
8. Install the tire and wheel assembly. Refer to «Tire and Wheel Removal and Installation»(/cadillac/elr/i-2013-2015/remont/wheel-tire-system/#tires-and-wheels__tire-and-wheel-removal-and-installation) .
9. Burnish the brake pads and rotors. Refer to «Brake Pad and Rotor Burnishing»(/cadillac/elr/i-2013-2015/remont/mechanical-hydraulic/#disc-brake-system__brake-pad-and-rotor-burnishing) .

1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/elr/i-2013-2015/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) .
2. Remove the front tire and wheel assembly. Refer to «Tire and Wheel Removal and Installation»(/cadillac/elr/i-2013-2015/remont/wheel-tire-system/#tires-and-wheels__tire-and-wheel-removal-and-installation) .
3. Remove the front wheel bearing and hub assembly. Refer to «Front Wheel Bearing and Hub Replacement»(/cadillac/elr/i-2013-2015/remont/suspension-front/#front-suspension-system) .
4. Remove the front brake shield (1).

1. Install the front brake shield (1).
2. Install the front wheel bearing and hub assembly. Refer to «Front Wheel Bearing and Hub Replacement»(/cadillac/elr/i-2013-2015/remont/suspension-front/#front-suspension-system) .
3. Install the tire and wheel assembly. Refer to «Tire and Wheel Removal and Installation»(/cadillac/elr/i-2013-2015/remont/wheel-tire-system/#tires-and-wheels__tire-and-wheel-removal-and-installation) .

1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/elr/i-2013-2015/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) .
2. Remove the tire and wheel assembly. Refer to «Tire and Wheel Removal and Installation»(/cadillac/elr/i-2013-2015/remont/wheel-tire-system/#tires-and-wheels__tire-and-wheel-removal-and-installation) .
3. Remove the rear wheel bearing and hub assembly (1). Refer to «Rear Wheel Bearing and Hub Replacement»(/cadillac/elr/i-2013-2015/remont/suspension-rear/#rear-suspension-system) .
4. Remove the rear brake shield (1).

1. Install the rear brake shield (1).
2. Install the rear wheel bearing and hub assembly (1). Refer to «Rear Wheel Bearing and Hub Replacement»(/cadillac/elr/i-2013-2015/remont/suspension-rear/#rear-suspension-system) .
3. Install the tire and wheel assembly. Refer to «Tire and Wheel Removal and Installation»(/cadillac/elr/i-2013-2015/remont/wheel-tire-system/#tires-and-wheels__tire-and-wheel-removal-and-installation) .

Brake Rotor Assembled Lateral Runout Correction

Note. Brake rotor thickness variation MUST be checked BEFORE checking for assembled lateral runout (LRO). Thickness variation exceeding the maximum acceptable level can cause brake pulsation. Refer to Brake Rotor Thickness Variation Measurement . Brake rotor assembled lateral runout (LRO) exceeding the maximum allowable specification can cause thickness variation to develop in the brake rotor over time, usually between 4 800-11 300 km (3,000-7,000 mi). Refer to Brake Rotor Assembled Lateral Runout Measurement .

Review the following acceptable methods for bringing the brake rotor assembled LRO to within specifications. Determine which method to use for the specific vehicle being repaired.

1. The indexing method of correcting assembled LRO is most effective when the LRO specification is only exceeded by a relatively small amount: 0.025-0.127 mm (0.001-0.005 in). Indexing is used to achieve the best possible match of high spots to low spots between related components. Refer to «Brake Rotor Assembled Lateral Runout Correction - Indexing»(/cadillac/elr/i-2013-2015/remont/mechanical-hydraulic/#disc-brake-system__brake-rotor-assembled-lateral-runout-correction) .
2. The correction plate method of correcting assembled LRO involves the addition of a tapered plate between the brake rotor and the hub/axle flange. The correction plate method can be used to correct LRO that exceeds the specification by up to 0.23 mm (0.009 in). Refer to «Brake Rotor Assembled Lateral Runout Correction - Correction Plates»(/cadillac/elr/i-2013-2015/remont/mechanical-hydraulic/#disc-brake-system__brake-rotor-assembled-lateral-runout-correction) .
3. The on-vehicle brake lathe method is used to bring the LRO to within specifications through compensating for LRO while refinishing the brake rotor. Refer to «Brake Rotor Assembled Lateral Runout Correction - On Vehicle Lathe»(/cadillac/elr/i-2013-2015/remont/mechanical-hydraulic/#disc-brake-system__brake-rotor-assembled-lateral-runout-correction) .

If the assembled LRO cannot be corrected using these methods, then other components must be suspected as causing and/or contributing to the LRO concern.

Brake Rotor Assembled Lateral Runout Correction - Indexing

Note. This Procedure is not used in Europe

Special Tools

CH-45101-100 Conical Brake Rotor Washers

For equivalent regional tools, refer to Special Tools .

1. Remove the CH-45101-100 Conical Brake Rotor Washers and the lug nuts that were installed during the assembled LRO measurement procedure.
2. Inspect the mating surface of the hub/axle flange and the brake rotor to ensure that there are no foreign particles or debris remaining.
3. Index the brake rotor in a different orientation to the hub/axle flange.
4. Hold the rotor firmly in place against the hub/axle flange and install one of the CH-45101-100 Conical Brake Rotor Washers (1) and one lug nut (2) onto the upper-most wheel stud.
5. Continue to hold the rotor secure and tighten the lug nut firmly by hand.
6. Install the remaining CH-45101-100 Conical Brake Rotor Washers and lug nuts onto the wheel studs and tighten the nuts firmly by hand in a star-pattern.
7. Tighten the lug nuts in a star-pattern to specification, in order to properly secure the rotor. Refer to «Tire and Wheel Removal and Installation»(/cadillac/elr/i-2013-2015/remont/wheel-tire-system/#tires-and-wheels__tire-and-wheel-removal-and-installation) .
8. Measure the assembled LRO of the brake rotor. Refer to «Brake Rotor Assembled Lateral Runout Measurement»(/cadillac/elr/i-2013-2015/remont/mechanical-hydraulic/#disc-brake-system__brake-rotor-assembled-lateral-runout-measurement) .
9. Compare the amount of change between this measurement and the original measurement.
10. If this measurement is within specifications, proceed to step 14.
11. If this measurement still exceeds specifications, repeat steps 1-9 until the best assembled LRO measurement is obtained.
12. Matchmark the final location of the rotor to the wheel studs if the orientation is different than it was originally.
13. If the brake rotor assembled LRO measurement still exceeds the maximum allowable specification, refer to «Brake Rotor Assembled Lateral Runout Correction»(/cadillac/elr/i-2013-2015/remont/mechanical-hydraulic/#disc-brake-system__brake-rotor-assembled-lateral-runout-correction) .
14. If the brake rotor assembled LRO is within specification, install the brake caliper and depress the brake pedal several times to secure the rotor in place before removing the CH-45101-100 Conical Brake Rotor Washers and the lug nuts.

Brake Rotor Assembled Lateral Runout Correction - Correction Plates

Note. This procedure not used in Europe

Special Tools

CH-45101-100 Conical Brake Rotor Washers

For equivalent regional tools, refer to Special Tools .

1. Rotate the brake rotor to position the high spot, identified and marked during the brake rotor assembled LRO measurement procedure, to face upward.
2. Remove the CH-45101-100 Conical Brake Rotor Washers and the lug nuts that were installed during the assembled LRO measurement procedure and/or the indexing correction procedure.
3. Inspect the mounting surface of the hub/axle flange and the brake rotor to ensure that there are no foreign particles or debris remaining.
4. Select the correction plate, following the manufacturer's instructions, which has a specification closest to the assembled LRO measurement. For example: If the assembled LRO measurement was 0.076 mm (0.003 in), the 0.076 mm (0.003 in) correction plate would be used. If the measurement was 0.127 mm (0.005 in), the 0.152 mm (0.006 in) correction plate would be used.
5. Determine the positioning for the correction plate (1) using the high spot mark (3) made during the brake rotor assembled LRO measurement procedure.
6. Install the correction plate (1) onto the hub/axle flange, with the V-shaped notch (2) orientated to align with the high spot mark (3), that was positioned to face upward.
7. Install the brake rotor to the hub/axle flange. Use the matchmark made prior to removal for proper orientation to the flange.
8. Hold the rotor firmly in place against the hub/axle flange and install one of the CH-45101-100 Conical Brake Rotor Washers (1) and one lug nut (2) onto the upper-most wheel stud.
9. Continue to hold the rotor secure and tighten the lug nut firmly by hand.
10. Install the remaining CH-45101-100 Conical Brake Rotor Washers and lug nuts onto the wheel studs and tighten the nuts firmly by hand in a star-pattern.
11. Tighten the lug nuts in a star-pattern to specification, in order to properly secure the rotor. Refer to «Tire and Wheel Removal and Installation»(/cadillac/elr/i-2013-2015/remont/wheel-tire-system/#tires-and-wheels__tire-and-wheel-removal-and-installation) .
12. Measure the assembled LRO of the brake rotor. Refer to «Brake Rotor Assembled Lateral Runout Measurement»(/cadillac/elr/i-2013-2015/remont/mechanical-hydraulic/#disc-brake-system__brake-rotor-assembled-lateral-runout-measurement) .
13. If the brake rotor assembled LRO measurement still exceeds the maximum allowable specification, refer to «Brake Rotor Assembled Lateral Runout Correction»(/cadillac/elr/i-2013-2015/remont/mechanical-hydraulic/#disc-brake-system__brake-rotor-assembled-lateral-runout-correction) .
14. If the brake rotor assembled LRO measurement is within specification, install the brake caliper and depress the brake pedal several times to secure the rotor in place before removing the CH-45101-100 Conical Brake Rotor Washers and the lug nuts.

Brake Rotor Assembled Lateral Runout Correction - On Vehicle Lathe

Note. This procedure is not used in Europe.

Special Tools

CH-45101-100 Conical Brake Rotor Washers

For equivalent regional tools, refer to Special Tools .

1. Ensure that the caliper and caliper bracket that are already being supported, are clear from contacting any rotating components, such as the brake rotor.
2. Remove the CH-45101-100 Conical Brake Rotor Washers and the lug nuts that were installed during the assembled LRO measurement procedure and/or the indexing correction procedure.
3. Inspect the mounting surface of the hub/axle flange and the brake rotor to ensure that there are no foreign particles or debris remaining.
4. Set up the lathe, following the manufacturer's instructions.
5. Refinish the brake rotor, following the brake lathe manufacturer's instructions.
6. After each successive cut, inspect the brake rotor thickness. Refer to «Brake Rotor Thickness Measurement»(/cadillac/elr/i-2013-2015/remont/mechanical-hydraulic/#disc-brake-system__brake-rotor-thickness-measurement) .
7. If at any time the brake rotor exceeds the minimum allowable thickness after refinish specification, the brake rotor must be replaced. After replacing the rotor, proceed to step 10.
8. After refinishing the brake rotor, use the following procedure in order to obtain the desired non-directional finish: Follow the brake lathe manufacturer's recommended speed setting for applying a non-directional finish. Using moderate pressure, apply the non-directional finish: If the lathe is equipped with a non-directional finishing tool, apply the finish with 120-grit aluminum oxide sandpaper. If the lathe is not equipped with a non-directional finishing tool, apply the finish with a sanding block and 150-grit aluminum oxide sandpaper. After applying a non-directional finish, clean each friction surface of the brake rotor with denatured alcohol, or an equivalent approved brake cleaner.
9. Remove the lathe from the vehicle.
10. Measure the assembled LRO of the brake rotor. Refer to «Brake Rotor Assembled Lateral Runout Measurement»(/cadillac/elr/i-2013-2015/remont/mechanical-hydraulic/#disc-brake-system__brake-rotor-assembled-lateral-runout-measurement) .
11. If the brake rotor assembled LRO measurement still exceeds the maximum allowable specification, refer to «Brake Rotor Assembled Lateral Runout Correction»(/cadillac/elr/i-2013-2015/remont/mechanical-hydraulic/#disc-brake-system__brake-rotor-assembled-lateral-runout-correction) .
12. If the brake rotor assembled LRO is within specification, install the brake caliper and depress the brake pedal several times to secure the rotor in place before removing the CH-45101-100 Conical Brake Rotor Washers and the lug nuts.

Brake Rotor Refinishing

Special Tools

1. CH-41013 Rotor Resurfacing Kit
2. CH-42450-A Wheel Hub Resurfacing Kit

For equivalent regional tools, refer to Special Tools .

Note. The disc brake rotors do not require refinishing as part of routine brake system service. New disc brake rotors do not require refinishing. Do not refinish disc brake rotors in an attempt to correct the following conditions: Brake system noise - squeal, growl, groan Uneven and/or premature disc brake pad wear Superficial or cosmetic corrosion/rust of the disc brake rotor friction surface Scoring of the disc brake rotor friction surface less than the maximum allowable specification Before refinishing a brake rotor, the rotor MUST first be checked for adequate thickness to allow the rotor to be refinished and remain above the minimum allowable thickness after refinish specification. Refer to Brake Rotor Thickness Measurement . Disc brake rotors should only be refinished if they have adequate thickness to be refinished and if one or more of the following conditions exist: Thickness variation in excess of the maximum allowable specification Excessive corrosion/rust and/or pitting Cracks and/or heat spots Excessive blueing discoloration Scoring of the disc brake rotor surface in excess of the maximum allowable specification Disc brake rotors may need to be refinished as part of the process for correcting brake rotor assembled lateral runout (LRO) that exceeds the maximum allowable specification.

Note. If the vehicle is equipped with cross-drilled rotors, use a lathe with positive rake tooling. This setup requires less cutting pressure, which will result in less vibration, and a better surface finish. Also, use a vibration dampener when cutting. Otherwise, refinish according to the following instructions.

1. Using the CH-42450-A Wheel Hub Resurfacing Kit , thoroughly clean any rust or corrosion from the mating surface of the hub/axle flange.
2. Using the CH-41013 Rotor Resurfacing Kit , thoroughly clean any rust or corrosion from the mating surface and mounting surface of the brake rotor.
3. Inspect the mating surfaces of the hub/axle flange and the rotor to ensure that there are no foreign particles or debris remaining.
4. Mount the brake rotor to the brake lathe according to the lathe manufacturer's instructions, ensuring that all mounting attachments and adapters are clean and free of debris.
5. Ensure that any vibration dampening attachments are securely in place.
6. With the brake lathe running, slowly bring in the cutting tools until they just contact the brake rotor friction surfaces.
7. Observe the witness mark on the brake rotor. If the witness mark extends approximately three-quarters or more of the way around the brake rotor friction surface on each side, the brake rotor is properly mounted to the lathe.
8. If the witness mark does not extend three-quarters or more of the way around the brake rotor, re-mount the rotor to the lathe.
9. Following the brake lathe manufacturer's instructions, refinish the brake rotor.
10. After each successive cut, inspect the brake rotor thickness. Refer to «Brake Rotor Thickness Measurement»(/cadillac/elr/i-2013-2015/remont/mechanical-hydraulic/#disc-brake-system__brake-rotor-thickness-measurement) .
11. If at any time the brake rotor exceeds the minimum allowable thickness after refinish specification, the brake rotor must be replaced.
12. After refinishing the brake rotor, use the following procedure in order to obtain the desired non-directional finish: Follow the brake lathe manufacturer's recommended speed setting for applying a non-directional finish. Using moderate pressure, apply the non-directional finish: If the lathe is equipped with a non-directional finishing tool, apply the finish with 120-grit aluminum oxide sandpaper. If the lathe is not equipped with a non-directional finishing tool, apply the finish with a sanding block and 150-grit aluminum oxide sandpaper. NOTE: Thoroughly cleaning the brake rotor will prevent the possible transfer of finite metal dust left as a by-product of machining to the brake pad material during the burnishing process, thereby reducing the possibility for brake squeal or other brake noises to occur. After applying a non-directional finish, clean each friction surface of the brake rotor with a solution of mild dish washing detergent and water, or a GM approved brake cleaner and a clean shop towel to remove metal particles remaining from machining. Repeat the cleaning process if necessary to remove all metal particles.
13. Remove the brake rotor from the brake lathe.
14. Measure the assembled LRO of the brake rotor to ensure optimum performance of the disc brakes. Refer to «Brake Rotor Assembled Lateral Runout Measurement»(/cadillac/elr/i-2013-2015/remont/mechanical-hydraulic/#disc-brake-system__brake-rotor-assembled-lateral-runout-measurement) .
15. If the brake rotor assembled LRO measurement exceeds the specification, bring the LRO to within specifications. Refer to «Brake Rotor Assembled Lateral Runout Correction»(/cadillac/elr/i-2013-2015/remont/mechanical-hydraulic/#disc-brake-system__brake-rotor-assembled-lateral-runout-correction) .

System Component Description

The disc brake system consists of the following components

System Operation

Mechanical output force is applied from the hydraulic brake caliper pistons to the inner brake pads. As the pistons press the inner brake pads outward, the caliper housings draw the outer brake pads inward. This allows the output force to be equally distributed. The brake pads apply the output force to the friction surfaces on both sides of the brake rotors, which slows the rotation of the tire and wheel assemblies. The correct function of both the brake pad and brake caliper hardware is essential for even distribution of braking force.

Special Tools

Illustration Tool Number/ Description CH 41013 J 41013 Rotor Resurfacing Kit CH 42450-A J 42450-A Wheel Hub Resurfacing Kit CH 45101 J 45101 Hub and Wheel Runout Gauge CH 45101-100 J 45101-100 Conical Brake Rotor Washers

Scheme 8

Scheme 9

Scheme 10

Scheme 11

See also:
• Brake Dust Warning
• Tire and Wheel Removal and Installation
• Lifting and Jacking the Vehicle
• Fastener Caution
• Master Cylinder Reservoir Filling
• Brake Fluid Irritant Warning
• Hydraulic Brake System Bleeding (Manual)
• Parking Brake Cable Adjuster Disabling
• Parking Brake Cable Adjuster Enabling
• Front Wheel Bearing and Hub Replacement
• Rear Wheel Bearing and Hub Replacement
• Front Disc Brake Pads Replacement
• Disc Brake Component Specifications
• Special Tools
• Brake Rotor Thickness Variation Measurement
• Front Brake Rotor Replacement
• Rear Brake Rotor Replacement
• Brake Rotor Refinishing
• Brake Rotor Assembled Lateral Runout Correction
• Brake Pad and Rotor Burnishing
• Adhesives, Fluids, Lubricants, and Sealers
• Brake Rotor Assembled Lateral Runout Measurement
• Brake Rotor Thickness Measurement