Disc Brake System Cadillac DTS I

Fastener Tightening Specifications

Disc Brake Component Specifications (JL9)

Disc Brake Component Specifications (J55)

Diagnostic Starting Point - Disc Brakes

Begin the disc brake system diagnosis with Diagnostic Starting Point - Hydraulic Brakes . The use of the Diagnostic Starting Point will lead to the identification of the correct procedure for diagnosing the system and where the procedure is located.

Brake Rotor Thickness Measurement (JL9)

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 (JL9)»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system) or «Front Disc Brake Pads Replacement (J55)»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system__front-disc-brake-pads-replacement-j55) and/or «Rear Disc Brake Pads Replacement (JL9)»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system) or «Rear Disc Brake Pads Replacement (J55)»(/cadillac/dts/i-2005-2011/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 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 to the following specifications. Refer to «Disc Brake Component Specifications (JL9)»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system__disc-brake-component-specifications-jl9) or «Disc Brake Component Specifications (J55)»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system__disc-brake-component-specifications-j55) .
5. If the lowest thickness measurement of the brake rotor is above the minimum thickness 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 below the minimum thickness specification, the rotor may not be refinished.
7. If the lowest thickness measurement of the brake rotor is below the minimum thickness specification, the rotor requires replacement.

Brake Rotor Thickness Measurement (J55)

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 (JL9)»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system) or «Front Disc Brake Pads Replacement (J55)»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system__front-disc-brake-pads-replacement-j55) and/or «Rear Disc Brake Pads Replacement (JL9)»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system) or «Rear Disc Brake Pads Replacement (J55)»(/cadillac/dts/i-2005-2011/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 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 to the following specifications. Refer to «Disc Brake Component Specifications (JL9)»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system__disc-brake-component-specifications-jl9) or «Disc Brake Component Specifications (J55)»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system__disc-brake-component-specifications-j55) .
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

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 (JL9)»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system) or «Front Disc Brake Pads Replacement (J55)»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system__front-disc-brake-pads-replacement-j55) and/or «Rear Disc Brake Pads Replacement (JL9)»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system) or «Rear Disc Brake Pads Replacement (J55)»(/cadillac/dts/i-2005-2011/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 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. 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: 0.02 mm (0.001 in)
6. If the brake rotor thickness variation measurement exceeds the specification, the rotor requires refinishing or replacement.

Brake Rotor Surface & 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 (JL9)»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system) or «Front Disc Brake Pads Replacement (J55)»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system__front-disc-brake-pads-replacement-j55) and/or «Rear Disc Brake Pads Replacement (JL9)»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system) or «Rear Disc Brake Pads Replacement (J55)»(/cadillac/dts/i-2005-2011/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 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

Tools Required

1. J 39544-KIT Torque-Limiting Socket Set, or equivalent. See «Special Tools»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system__special-tools) .
2. J 41013 Rotor Resurfacing Kit. See «Special Tools»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system__special-tools) .
3. J 42450-A Wheel Hub Resurfacing Kit. See «Special Tools»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system__special-tools) .
4. J 45101 Hub and Wheel Runout Gage. See «Special Tools»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system__special-tools) .
5. J 45101-100 Conical Brake Rotor Washers. See «Special Tools»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system__special-tools) .

Measurement Procedure

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 (J55)»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system__front-brake-rotor-replacement-j55) «Front Brake Rotor Replacement (JL9)»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system) and/or «Rear Brake Rotor Replacement (JL9)»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system) «Rear Brake Rotor Replacement (J55)»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system) . Using the J 42450-A , thoroughly clean any rust or corrosion from the mating surface of the hub/axle flange. See «Special Tools»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system__special-tools) . Using the J 41013 , thoroughly clean any rust or corrosion from the mating surface of the brake rotor. See «Special Tools»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system__special-tools) . 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 the J 45101-100 (1), and one lug nut (2) onto the upper-most wheel stud. See «Special Tools»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system__special-tools) .
5. Continue to hold the rotor secure and tighten the lug nut firmly by hand.
6. Install the remaining J 45101-100 and lug nuts onto the wheel studs and tighten the nuts firmly by hand in a star-pattern. See «Special Tools»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system__special-tools) .
7. Using the J 39544-KIT , or equivalent, tighten the lug nuts in a star-pattern to specification, in order to properly secure the rotor. See «Special Tools»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system__special-tools) . Refer to «Tire and Wheel Removal and Installation»(/cadillac/dts/i-2005-2011/remont/wheel-tire-system/#tires-and-wheels__tire-wheel-removal-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, J 45101 , 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. See «Special Tools»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system__special-tools) .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: 0.06 mm (0.002 in) Front brake rotor (J55) maximum allowable assembled lateral runout: 0.127 mm (0.005 in) Rear brake rotor maximum allowable assembled lateral runout: 0.06 mm (0.002 in) Rear brake rotor (J55) maximum allowable assembled lateral runout: 0.127 mm (0.005 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/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system__brake-rotor-refinishing) . After refinishing the rotor, proceed to step 14.
14. Mount a dial indicator, J 45101 , 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. See «Special Tools»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system__special-tools) .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: 0.06 mm (0.002 in) Front brake rotor (J55) maximum allowable assembled lateral runout: 0.127 mm (0.005 in) Rear brake rotor maximum allowable assembled lateral runout: 0.06 mm (0.002 in) Rear brake rotor (J55) maximum allowable assembled lateral runout: 0.127 mm (0.005 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/dts/i-2005-2011/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 J 45101-100 and the lug nuts. See «Special Tools»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system__special-tools) .

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 piston, or pistons, into the caliper bore, or bores: The movement of a caliper piston into a caliper bore should be smooth and even. If a 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 & Hardware Inspection

1. Install a large C-clamp, over the body of the brake caliper with the C-clamp ends against the rear of the caliper body and against the outer brake pad.
2. Tighten the C-clamp until the caliper piston is compressed into the caliper bore enough to allow the caliper to slide past the brake rotor.
3. Remove the C-clamp from the caliper.
4. Grasp the brake caliper and try to move the brake caliper up or down. The brake caliper should not have excessive looseness.
5. Grasp the brake caliper and try to move the brake caliper in and out. The brake caliper should slide smoothly with minimal force.
6. Inspect the brake caliper retainers.
7. Inspect the disc brake pad mounting hardware for the following: Bent mounting tabs Excessive corrosion Looseness at the brake caliper mounting bracket Looseness at the disc brake pads Missing mounting hardware
8. If any of the conditions listed are found, the disc brake pad mounting hardware requires replacement.
9. 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.
10. Inspect the brake caliper bolts for the following: Bent or damaged brake caliper bolts Bent or damaged brake caliper mounting bracket Binding Corrosion Cracked or torn boots Looseness in the brake caliper mounting bracket Missing boots Seizing
11. If any of the conditions listed are found, the brake caliper mounting hardware requires replacement.

Rear Disc Brake Mounting & Hardware Inspection

1. Compress the piston until resistance is felt, but no more than 1 mm of piston travel.
2. Grasp the brake caliper and try to move the brake caliper up or down. The brake caliper should not have excessive looseness.
3. Grasp the brake caliper and try to move the brake caliper in and out. The brake caliper should slide smoothly with minimal force.
4. Inspect the brake caliper retainers.
5. Inspect the disc brake pad mounting hardware for the following: Bent mounting tabs Excessive corrosion Looseness at the brake caliper mounting bracket Looseness at the disc brake pads Missing mounting hardware
6. If any of the conditions listed are found, the disc brake pad mounting hardware requires replacement.
7. 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.
8. Inspect the brake caliper bolts for the following: Bent or damaged brake caliper bolts Bent or damaged brake caliper mounting bracket Binding Corrosion Cracked or torn boots Looseness in the brake caliper mounting bracket Missing boots Seizing
9. If any of the conditions listed are found, the brake caliper mounting hardware requires replacement.

Scheme 1

Front Disc Brake Pads Replacement (J55)

Note. Refer to Brake Fluid Effects on Paint and Electrical Components Notice .

Removal Procedure

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 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, remove brake fluid to the midway point before proceeding.
4. Raise the vehicle and suitably support. Refer to «Lifting and Jacking the Vehicle»(/cadillac/dts/i-2005-2011/remont/hoistjack/#general-information__lifting-jacking-the-vehicle) .
5. Mark the relationship of the wheel to the axle flange.
6. Remove the tire and wheel assembly. Refer to «Tire and Wheel Removal and Installation»(/cadillac/dts/i-2005-2011/remont/wheel-tire-system/#tires-and-wheels__tire-wheel-removal-installation) .
7. Install a large C-clamp over the body of the brake caliper with the C-clamp ends against the rear of the caliper body and against the outer brake pads.
8. Tighten the C-clamp until the caliper pistons are compressed into the caliper bore enough to allow the caliper to slide past the brake rotor.
9. Remove the C-clamp from the brake caliper.
10. Remove the brake caliper pin bolts (1).
11. Pivot the brake caliper body upward and secure out of the way with heavy mechanic's wire or equivalent. Do NOT disconnect the hydraulic brake flexible hose from the caliper.
12. Install a large C-clamp (1) over the body of the brake caliper (3) with the C-clamp ends against the rear of the caliper body and against an old inner brake pad or a wood block (2) installed against the caliper pistons.
13. Tighten the C-clamp until the caliper pistons are compressed completely into the caliper bore.
14. Remove the C-clamp and the old brake pad or wood block from the caliper.
15. Remove the inboard and outboard brake pads from the brake caliper mounting bracket.
16. Remove and inspect the brake pad retainers.

Installation Procedure

1. Inspect the brake caliper bolt suspension boots for cuts, tears, or deterioration. If damaged, replace the pin boots. Refer to «Front Disc Brake Hardware Replacement (JL9)»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system) or «Front Disc Brake Hardware Replacement (J55)»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system__front-disc-brake-hardware-replacement-j55) .
2. Inspect the brake caliper pin bolts for damage or corrosion. Replace if damaged or corroded. Do not attempt to clean away corrosion. Corrosion is typically caused by damaged pin boots. Refer to «Front Disc Brake Hardware Replacement (JL9)»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system) or «Front Disc Brake Hardware Replacement (J55)»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system__front-disc-brake-hardware-replacement-j55) .
3. Inspect the piston boot for deterioration, replace if damaged. Refer to «Front Brake Caliper Overhaul»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system__front-brake-caliper-overhaul) .
4. Install the brake pad retainers into the brake caliper bracket.
5. Pivot the brake caliper down over the brake pads and into the brake caliper bracket.
6. Apply a thin coat of high temperature silicone lube to the front brake caliper pin bolts.
7. Insert the lower brake caliper pin bolt (1). Tighten: Tighten the brake caliper pin bolts to 113 N.m (83 lb ft).
8. Install the tire and wheel assembly. Refer to «Tire and Wheel Removal and Installation»(/cadillac/dts/i-2005-2011/remont/wheel-tire-system/#tires-and-wheels__tire-wheel-removal-installation) .
9. Lower the vehicle.
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 apply is obtained; this will properly seat the brake caliper pistons and brake pads.
13. Fill the brake master cylinder reservoir to the proper level. Refer to «Master Cylinder Reservoir Filling»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#hydraulic-brake-system__master-cylinder-reservoir-filling) .
14. Burnish the pads and rotors. Refer to «Brake Pad and Rotor Burnishing»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system__brake-pad-rotor-burnishing) .

Scheme 2

Scheme 3

Brake Pad & 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). IMPORTANT: 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.

Front Brake Caliper Replacement (J55)

Note. Refer to Brake Fluid Effects on Paint and Electrical Components Notice .

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 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, remove brake fluid to the midway point before proceeding.
4. Raise the vehicle and suitably support. Refer to «Lifting and Jacking the Vehicle»(/cadillac/dts/i-2005-2011/remont/hoistjack/#general-information__lifting-jacking-the-vehicle) .
5. Mark the relationship of the wheel to the axle flange.
6. Remove the tire and wheel assembly. Refer to «Tire and Wheel Removal and Installation»(/cadillac/dts/i-2005-2011/remont/wheel-tire-system/#tires-and-wheels__tire-wheel-removal-installation) .
7. Install a large C-clamp over the body of the brake caliper with the C-clamp ends against the rear of the caliper body and against the outer brake pads.
8. Tighten the C-clamp until the caliper pistons are compressed into the caliper bores enough to allow the caliper to slide past the brake rotor.
9. Remove the C-clamp from the brake caliper.
10. Remove the brake hose to caliper bolt attaching the brake hose to the brake caliper.
11. Remove and discard the 2 copper brake hose gaskets. These gaskets may be stuck to the brake caliper and/or the brake hose end.
12. Plug the opening in the brake caliper and pipe to prevent fluid loss and contamination.
13. Remove the brake caliper pin bolts (1).
14. Remove the brake caliper.

1. If reusing the brake caliper pin bolts and retainers, clean the brake caliper pin bolts and retainers using denatured alcohol, or equivalent.
2. Dry the brake caliper pin bolts and retainers, using non-lubricated, filtered air.
3. Install the brake caliper over the brake pads and into the brake caliper bracket.
4. Apply a thin coat of high temperature silicone brake lubricant to the brake caliper pin bolts: do NOT apply lubricant to the brake pad hardware.
5. Install the brake caliper pin bolts. Tighten: Tighten the brake caliper pin bolts to 113 N.m (83 lb ft).
6. Assemble the brake hose bolt and the NEW copper brake hose gaskets to the brake hose.
7. Install the brake hose to caliper bolt to the brake caliper. Tighten: Tighten the brake hose to caliper bolt to 45 N.m (33 lb ft).
8. Bleed the brake system. Refer to «Hydraulic Brake System Bleeding (Manual)»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#hydraulic-brake-system) or «Hydraulic Brake System Bleeding (Pressure)»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#hydraulic-brake-system) .
9. With the engine OFF, gradually apply the brake pedal to approximately 2/3 of its travel distance.
10. Slowly release the brake pedal.
11. Wait 15 seconds, then repeat steps 9-10 until a firm brake pedal apply is obtained; this will properly seat the brake caliper pistons and brake pads.
12. Install the tire and wheel assembly. Refer to «Tire and Wheel Removal and Installation»(/cadillac/dts/i-2005-2011/remont/wheel-tire-system/#tires-and-wheels__tire-wheel-removal-installation) .
13. Lower vehicle.

Scheme 4

Scheme 5

Scheme 6

Front Brake Caliper Overhaul

Tools Required

1. J 8092 Driver Handle. See «Special Tools»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system__special-tools) .
2. J 45863 Boot Seal Installer. See «Special Tools»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system__special-tools) .

Disassembly Procedure

1. Drain all the brake fluid from the caliper.
2. Install the brake caliper in a suitable holding devise.
3. Insert a piece of wood in the brake caliper.
4. Cover the brake caliper with a shop towel.
5. Using compressed filtered, non-lubricated air, apply the air to the remove the pistons from the brake caliper.
6. If one of the pistons fails to be removed from the brake caliper, perform the following steps. Reposition the piston that has been removed back in the brake caliper. Using a small block of wood and a C-clamp, slowly tighten the C-clamp until the piston it is half way in the brake caliper. It does not have to be fully seated. Position a second block of wood in front of the piston that remains in the brake caliper. Cover the brake caliper with a shop towel. Using compress filtered, non lubricated air, apply the air to the remove the pistons from the brake caliper.
7. Remove the pistons (3) from the caliper bores.
8. Remove the piston seals (2) from the caliper bores. Do not use a metal tool.
9. Remove the bleeder valve cap (5).
10. Remove the bleeder valve (6) from the caliper housing (1).
11. Clean the bleeder valve, the caliper bores, the caliper passages and the pistons with denatured alcohol. Dry the parts and blow out the brake fluid passages. Use dry and filtered compressed air.
12. Remove the boots from the caliper bores. Do not scratch the caliper bores.
13. Replace the pistons or the caliper if any of the following conditions exist: Scoring in the caliper bores Corrosion in the caliper bores Pitting in the caliper bores Damage to the pistons (phenolic)
14. Clean the brake caliper assembly with denatured alcohol.
15. Dry with filtered, lubricated compressed air.

Assembly Procedure

1. Apply a small amount of clean DOT-3 brake fluid to the piston, piston seal, and piston bore.
2. Install the piston seal in the brake caliper.
3. Install the dust seal on the piston.
4. Install the piston in the brake caliper.
5. Position a piece of wood across the piston to be installed.
6. Applying equal pressure by hand while pushing down, install the piston in the bore.
7. Remove the piece of wood.
8. Using the J 8092 (1) and the J 45863 (2), install the piston dust seal in the brake caliper. See «Special Tools»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system__special-tools) .
9. Install the bleeder valve in the brake caliper housing. Tighten: Tighten the bleeder valve to 13 N.m (115 lb in).
10. Install bleeder valve cap.

1. Remove the rear brake caliper from vehicle. Refer to «Rear Brake Caliper Replacement (J55)»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system) or «Rear Brake Caliper Replacement (JL9)»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system) .
2. Drain the brake fluid from the caliper assembly.
3. 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.
4. Place a block of wood against the inside of the caliper body, opposite of the caliper piston.
5. Direct low pressure compressed air through the caliper inlet hose to remove the caliper piston.
6. Remove the piston dust boot seal (2) from the seal counterbore in the caliper and discard the dust boot seal.
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, excessive rust, and/or excessive corrosion are present in the caliper bore, replace the caliper assembly.
11. 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.
12. Clean the brake caliper piston bore and seal counterbore, the caliper piston, and the caliper sleeves with denatured alcohol, or equivalent.
13. Clean the brake caliper piston bore and seal counterbore, the caliper piston, and the caliper sleeves with denatured alcohol, or equivalent.
14. Dry the caliper piston bore and counterbore, the piston, and the sleeves with non-lubricated, filtered air.
15. Inspect the caliper piston for cracks, scoring, damage to the chrome plating, and/or damage to the integral adjusting mechanism. Replace the caliper piston if any of these conditions exist.
16. Inspect the caliper mounting holes for cracks, scoring, pitting, rust, and/or excessive corrosion. Replace the caliper assembly if any of these conditions exist.

1. Lubricate the new piston seal with GM approved, or equivalent DOT-3 brake fluid from a clean, sealed brake fluid container.
2. Install the lubricated, new piston seal into the caliper bore.
3. Install the new dust boot seal onto the caliper piston (2).
4. Insert the caliper piston into the caliper bore. Using a spanner type wrench, rotate the piston (2) clockwise to fully seat the piston into the caliper body (1).
5. Fully seat the piston dust boot seal in the seal counterbore.
6. Install the piston dust boot seal retaining ring to the groove in the caliper seal counterbore.
7. Install the brake caliper to the vehicle. Refer to «Rear Brake Caliper Replacement (J55)»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system) or «Rear Brake Caliper Replacement (JL9)»(/cadillac/dts/i-2005-2011/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.

Scheme 7

Front Disc Brake Hardware Replacement (J55)

1. Remove the front brake caliper from the mounting bracket and support the brake caliper (2) with heavy mechanic's wire (1), or equivalent; do NOT disconnect the hydraulic brake flexible hose from the caliper. Refer to «Front Brake Caliper Replacement (J55)»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system__front-brake-caliper-replacement-j55) or «Front Brake Caliper Replacement (JL9)»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system) .
2. Remove the brake pads from the brake caliper bracket.
3. Remove the brake pad retainers from the brake caliper bracket.
4. Remove the front brake caliper bracket. Refer to «Front Brake Caliper Bracket Replacement (J55)»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system__front-brake-caliper-bracket-replacement-j55) or «Front Brake Caliper Bracket Replacement (JL9)»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system) .
5. Mount the brake caliper bracket in a vise.
6. Using a flat bladed tool or punch carefully tap the pin bolt boots (1) from the brake caliper bracket (3).
7. Use a screwdriver or a small hook and carefully pull the bushings inward and remove the bushings from the brake caliper.
8. Remove the bushings (2) from the brake caliper bracket mounting bores.
9. Apply a thin coat of high temperature silicone lube to the new bushings (2).
10. Install new bushings (2) into bracket mounting bores.
11. Apply a thin coat of high temperature silicone lube to the new caliper pin bolt boots (3).
12. Install the front brake caliper bracket. Refer to «Front Brake Caliper Bracket Replacement (J55)»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system__front-brake-caliper-bracket-replacement-j55) or «Front Brake Caliper Bracket Replacement (JL9)»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system) .
13. Install the brake pad retainer to the caliper bracket.
14. Install the brake pads to the caliper bracket.
15. Install the front brake caliper. Refer to «Front Brake Caliper Replacement (J55)»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system__front-brake-caliper-replacement-j55) or «Front Brake Caliper Replacement (JL9)»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system) .

Scheme 8

Scheme 9

Front Brake Caliper Bracket Replacement (J55)

1. Remove the brake caliper from the mounting bracket and support the brake caliper (2) with heavy mechanic's wire (1), or equivalent. Do NOT disconnect the hydraulic brake flexible hose from the caliper. Refer to «Front Brake Caliper Replacement (J55)»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system__front-brake-caliper-replacement-j55) or «Front Brake Caliper Replacement (JL9)»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system) .
2. Remove the brake pads from the brake caliper bracket.
3. Remove the brake pad retainers from the brake caliper bracket.
4. Remove the brake caliper bracket bolt (1).
5. Remove the brake caliper bracket from the steering knuckle assembly.
6. Use a wire brush to clean any debris or rust from the brake caliper bracket.
7. Inspect the caliper mounting bracket for cracks or damage. Refer to «Brake Caliper Inspection»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system__brake-caliper-inspection) .
8. Replace the brake caliper bracket if cracked or damaged.

1. Prepare the bolts and the threaded holes for assembly: Thoroughly clean the residue from the bolt threads by using denatured alcohol or equivalent and allow to dry. Thoroughly clean the residue from the threaded holes by using denatured alcohol or equivalent and allow to dry.
2. Apply threadlocker GM P/N 12345493 (Canadian P/N 10953488) or equivalent to two-thirds of the threaded length of the lower caliper bracket bolts. Ensure that there are no gaps in the threadlocker along the length of the filled area of the bolts.
3. Allow the threadlocker to cure approximately ten minutes before installation.

1. Install the caliper bracket to the steering knuckle assembly.
2. Install the brake caliper bracket bolt. Tighten: Tighten the caliper bracket bolt to 246 N.m (181 lb ft).
3. Apply a thin coat of high temperature silicone lube to the brake caliper pin bolts.
4. Install the brake pad retainers to the brake caliper bracket.
5. Install the brake pads to the brake caliper bracket.
6. Install the caliper. Refer to «Front Brake Caliper Replacement (J55)»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system__front-brake-caliper-replacement-j55) or «Front Brake Caliper Replacement (JL9)»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system) .

Scheme 10

Scheme 11

Scheme 12

Front Brake Rotor Replacement (J55)

Tools Required

1. J 41013 Rotor Resurfacing Kit. See «Special Tools»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system__special-tools) .
2. J 42450-A Wheel Hub Resurfacing Kit. See «Special Tools»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system__special-tools) .

1. Remove the tire and wheel assembly. Refer to «Tire and Wheel Removal and Installation»(/cadillac/dts/i-2005-2011/remont/wheel-tire-system/#tires-and-wheels__tire-wheel-removal-installation) .
2. Install a C-clamp over the body of the brake caliper, with the C-clamp ends against the rear of the caliper body and the outboard disc brake pad.
3. Using the C-clamp, compress the piston into the caliper bore just enough to allow the caliper to slide away from the rotor.
4. Remove the C-clamp.
5. Remove the brake caliper and the caliper mounting bracket as an assembly from the suspension knuckle and support the assembly with heavy mechanic's wire, or equivalent. Ensure that there is no tension on the hydraulic brake flexible hose. Refer to «Front Brake Caliper Bracket Replacement (J55)»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system__front-brake-caliper-bracket-replacement-j55) or «Front Brake Caliper Bracket Replacement (JL9)»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system) .
6. Mark the relationship of the rotor to the hub.
7. Remove the brake rotor.

1. Use the J 42450-A thoroughly clean any rust or corrosion from the mating surface of the hub/axle flange. See «Special Tools»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system__special-tools) .
2. Using the J 41013 thoroughly clean any rust or corrosion from the mating surface and mounting surface of the brake rotor. See «Special Tools»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system__special-tools) .
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. Install the brake rotor to the hub/axle flange. Use the matchmark made prior to removal for proper orientation to the flange.
5. If the brake rotor was removed and installed as part of a brake system repair, measure the assembled lateral runout (LRO) of the brake rotor to ensure optimum performance of the disc brakes. Refer to «Brake Rotor Assembled Lateral Runout Measurement»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system__brake-rotor-assembled-lateral-runout-measurement) .
6. 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/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system__brake-rotor-assembled-lateral-runout-correction) .
7. Install the brake caliper bracket assembly. Refer to «Front Brake Caliper Bracket Replacement (J55)»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system__front-brake-caliper-bracket-replacement-j55) or «Front Brake Caliper Bracket Replacement (JL9)»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system) .
8. Install the tire and wheel assembly. Refer to «Tire and Wheel Removal and Installation»(/cadillac/dts/i-2005-2011/remont/wheel-tire-system/#tires-and-wheels__tire-wheel-removal-installation) .
9. Lower the vehicle.
10. If the brake rotor was refinished or replaced, or if new brake pads were installed, burnish the pads and rotors. Refer to «Brake Pad and Rotor Burnishing»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system__brake-pad-rotor-burnishing) .

Scheme 13

Scheme 14

Scheme 15

Scheme 16

Scheme 17

Brake Rotor Assembled Lateral Runout Correction

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/dts/i-2005-2011/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/dts/i-2005-2011/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/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system) .

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

Tools Required

1. J 39544-KIT Torque-Limiting Socket Set, or equivalent. See «Special Tools»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system__special-tools) .
2. J 45101-100 Conical Brake Rotor Washers. See «Special Tools»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system__special-tools) .

Correction Procedure

1. Remove the J 45101-100 and the lug nuts that were installed during the assembled LRO measurement procedure. See «Special Tools»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system__special-tools) .
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 J 45101-100 (1) and one lug nut (2) onto the upper-most wheel stud. See «Special Tools»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system__special-tools) .
5. Continue to hold the rotor secure and tighten the lug nut firmly by hand.
6. Install the remaining J 45101-100 and lug nuts onto the wheel studs and tighten the nuts firmly by hand in a star-pattern. See «Special Tools»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system__special-tools) .
7. Using the J 39544-KIT , or equivalent, tighten the lug nuts in a star-pattern to specification, in order to properly secure the rotor. See «Special Tools»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system__special-tools) . Refer to «Tire and Wheel Removal and Installation»(/cadillac/dts/i-2005-2011/remont/wheel-tire-system/#tires-and-wheels__tire-wheel-removal-installation) .
8. Measure the assembled LRO of the brake rotor. Refer to «Brake Rotor Assembled Lateral Runout Measurement»(/cadillac/dts/i-2005-2011/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/dts/i-2005-2011/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 J 45101-100 and the lug nuts. See «Special Tools»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system__special-tools) .

Brake Rotor Assembled Lateral Runout Correction - Correction Plates

Tools Required

1. J 39544-KIT Complete Torque Socket Set-10 Pieces, or equivalent. See «Special Tools»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system__special-tools) .
2. J 45101-100 Conical Brake Rotor Washers. See «Special Tools»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system__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 J 45101-100 and the lug nuts that were installed during the assembled LRO measurement procedure and/or the indexing correction procedure. See «Special Tools»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system__special-tools) .
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 J 45101-100 (1) and one lug nut (2) onto the upper-most wheel stud. See «Special Tools»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system__special-tools) .
9. Continue to hold the rotor secure and tighten the lug nut firmly by hand.
10. Install the remaining J 45101-100 and lug nuts onto the wheel studs and tighten the nuts firmly by hand in a star-pattern. See «Special Tools»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system__special-tools) .
11. Using the J 39544-KIT , or equivalent, tighten the lug nuts in a star-pattern to specification, in order to properly secure the rotor. See «Special Tools»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system__special-tools) . Refer to «Tire and Wheel Removal and Installation»(/cadillac/dts/i-2005-2011/remont/wheel-tire-system/#tires-and-wheels__tire-wheel-removal-installation) .
12. Measure the assembled LRO of the brake rotor. Refer to «Brake Rotor Assembled Lateral Runout Measurement»(/cadillac/dts/i-2005-2011/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/dts/i-2005-2011/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 J 45101-100 and the lug nuts. See «Special Tools»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system__special-tools) .

Tools Required

J 45101-100 Conical Brake Rotor Washers. See 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 J 45101-100 and the lug nuts that were installed during the assembled LRO measurement procedure and/or the indexing correction procedure. See «Special Tools»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system__special-tools) .
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 (JL9)»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system__brake-rotor-thickness-measurement-jl9) or «Brake Rotor Thickness Measurement (J55)»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system__brake-rotor-thickness-measurement-j55) .
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/dts/i-2005-2011/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/dts/i-2005-2011/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 J 45101-100 and the lug nuts. See «Special Tools»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system__special-tools) .

Brake Rotor Refinishing

Tools Required

1. J 41013 Rotor Resurfacing Kit. See «Special Tools»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system__special-tools) .
2. J 42450-A Wheel Hub Resurfacing Kit. See «Special Tools»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system__special-tools) .

Refinishing Procedure

1. Using the J 42450-A , thoroughly clean any rust or corrosion from the mating surface of the hub/axle flange. See «Special Tools»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system__special-tools) .
2. Using the J 41013 , thoroughly clean any rust or corrosion from the mating surface and mounting surface of the brake rotor. See «Special Tools»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system__special-tools) .
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 (JL9)»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system__brake-rotor-thickness-measurement-jl9) or «Brake Rotor Thickness Measurement (J55)»(/cadillac/dts/i-2005-2011/remont/mechanical-hydraulic/#disc-brake-system__brake-rotor-thickness-measurement-j55) .
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. After applying a non-directional finish, clean each friction surface of the brake rotor with denatured alcohol, or an equivalent approved brake cleaner.
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/dts/i-2005-2011/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/dts/i-2005-2011/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 J 39544-KIT Complete Torque Socket Set - 10 Pieces J 41013 Rotor Resurfacing Kit J 42450-A Wheel Hub Resurfacing Kit J 45101 Hub and Wheel Runout Gage J 45101-100 Conical Brake Rotor Washers J 45515 Brake Caliper Piston Boot Seal Installer J 45863 Boot Seal Installer J 8092 Driver Handle

Scheme 18

Scheme 19

Scheme 20

Scheme 21

Scheme 22

Scheme 23

Scheme 24

See also:
• Diagnostic Starting Point - Hydraulic Brakes
• Brake Dust Caution
• Tire and Wheel Removal and Installation
• Brake Fluid Irritant Caution
• Brake Fluid Effects on Paint and Electrical Components Notice
• Fastener Notice
• Lifting and Jacking the Vehicle
• Master Cylinder Reservoir Filling
• Hydraulic Brake System Bleeding (Manual)
• Front Brake Hose Replacement
• Brake Caliper Supporting to Prevent Hose Damage Notice
• Rear Brake Hose Replacement
• Parking Brake Rear Cable Replacement - Left Side (JL9)
• Front Wheel Bearing and Hub Replacement (FE7)
• Rear Wheel Bearing and Hub Replacement (FE1, FE3)
• Front Disc Brake Pads Replacement (JL9)
• Front Disc Brake Pads Replacement (J55)
• Disc Brake Component Specifications (JL9)
• Disc Brake Component Specifications (J55)
• Special Tools
• Brake Rotor Thickness Variation Measurement
• Front Brake Rotor Replacement (J55)
• Brake Rotor Refinishing
• Brake Rotor Assembled Lateral Runout Correction
• Fastener Tightening Specifications
• Brake Pad and Rotor Burnishing
• Front Disc Brake Hardware Replacement (J55)
• Front Brake Caliper Overhaul
• Front Brake Caliper Replacement (J55)
• Front Brake Caliper Bracket Replacement (J55)
• Brake Caliper Inspection
• Brake Rotor Assembled Lateral Runout Measurement
• Brake Rotor Thickness Measurement (JL9)
• Brake Rotor Thickness Measurement (J55)