Disc Brake System Cadillac XLR I

Fastener Tightening Specifications

Fastener Tightening Specifications

Disc Brake Component Specifications

Disc Brake Component Specifications

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

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/xlr/i-2003-2009/remont/mechanical-hydraulic/#disc-brake-system) and/or «Rear Disc Brake Pads Replacement»(/cadillac/xlr/i-2003-2009/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: Specification: Front brake rotor minimum allowable thickness after refinishing: 30.6 mm (1.205 in) Front brake rotor discard thickness: 30.3 mm (1.19 in) Rear brake rotor minimum allowable thickness after refinishing: 24.9 mm (0.980 in) Rear brake rotor discard thickness: 24.5 mm (0.965 in)
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»(/cadillac/xlr/i-2003-2009/remont/mechanical-hydraulic/#disc-brake-system) and/or «Rear Disc Brake Pads Replacement»(/cadillac/xlr/i-2003-2009/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 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: 0.02 mm (0.001 in)
6. If the brake rotor thickness variation measurement exceeds the specification, the rotor requires refinishing or replacement.

Brake Rotor Surface 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/xlr/i-2003-2009/remont/mechanical-hydraulic/#disc-brake-system) and/or «Rear Disc Brake Pads Replacement»(/cadillac/xlr/i-2003-2009/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/xlr/i-2003-2009/remont/mechanical-hydraulic/#disc-brake-system__special-tools) .
2. J 41013 Rotor Resurfacing Kit. See «Special Tools»(/cadillac/xlr/i-2003-2009/remont/mechanical-hydraulic/#disc-brake-system__special-tools) .
3. J 42450-A Wheel Hub Resurfacing Kit. See «Special Tools»(/cadillac/xlr/i-2003-2009/remont/mechanical-hydraulic/#disc-brake-system__special-tools) .
4. J 45101 Hub and Wheel Runout Gage. See «Special Tools»(/cadillac/xlr/i-2003-2009/remont/mechanical-hydraulic/#disc-brake-system__special-tools) .
5. J 45101-100 Conical Brake Rotor Washers. See «Special Tools»(/cadillac/xlr/i-2003-2009/remont/mechanical-hydraulic/#disc-brake-system__special-tools) .

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/xlr/i-2003-2009/remont/mechanical-hydraulic/#disc-brake-system__front-brake-rotor-replacement) and/or «Rear Brake Rotor Replacement»(/cadillac/xlr/i-2003-2009/remont/mechanical-hydraulic/#disc-brake-system__rear-brake-rotor-replacement) . Using the J 42450-A , thoroughly clean any rust or corrosion from the mating surface of the hub/axle flange. See «Special Tools»(/cadillac/xlr/i-2003-2009/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/xlr/i-2003-2009/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 uppermost wheel stud. See «Special Tools»(/cadillac/xlr/i-2003-2009/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/xlr/i-2003-2009/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/xlr/i-2003-2009/remont/mechanical-hydraulic/#disc-brake-system__special-tools) . Refer to «Tire and Wheel Removal and Installation»(/cadillac/xlr/i-2003-2009/remont/wheel-tire-system/#tires-and-wheels) .
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/xlr/i-2003-2009/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: 0.05 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/xlr/i-2003-2009/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/xlr/i-2003-2009/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: 0.05 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/xlr/i-2003-2009/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/xlr/i-2003-2009/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 and Hardware Inspection

1. Inspect the disc brake pad mounting hardware for the following: Missing mounting hardware Excessive corrosion Bent mounting tabs Looseness at the caliper mounting bracket Looseness at the disc brake pads
2. If any of the conditions listed are found, the disc brake pad mounting hardware requires replacement.
3. Ensure the disc brake pads are held firmly in place on the caliper mounting bracket, yet slide easily on the mounting hardware without binding.
4. Inspect the caliper slide pins (3) by gently pulling outward, without disengaging the slides from the boots, then pushing inward, and observe for the following: Binding Seizing Looseness Bent or damaged slide pins Cracked or torn slide pin boots (2) Missing slide pin boots Bent or damaged caliper mounting bracket
5. If any of the conditions listed are found, the caliper mounting hardware requires replacement.

Rear Disc Brake Mounting and Hardware Inspection

1. Remove the disc brake caliper from the caliper mounting bracket.
2. Remove the disc brake pads from the caliper mounting bracket.
3. Inspect the disc brake pad mounting hardware for the following: Missing mounting hardware Excessive corrosion Bent mounting tabs Looseness at the caliper mounting bracket Looseness at the disc brake pads
4. If any of the conditions listed are found, the disc brake pad mounting hardware requires replacement.
5. Ensure the disc brake pads are held firmly in place on the caliper mounting bracket, yet slide easily on the mounting hardware without binding.
6. Inspect the caliper slide pins (3) by gently pulling outward (without disengaging the slides from the boots), then pushing inward, and observe for the following: Binding Seizing Looseness Bent or damaged slide pins Cracked or torn slide pin boots (2) Missing slide pin boots Bent or damaged caliper mounting bracket
7. If any of the conditions listed are found, the caliper mounting hardware requires replacement.
8. Install the disc brake pads to the caliper mounting bracket.
9. Install the disc brake caliper to the mounting bracket.

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 and suitably support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/xlr/i-2003-2009/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) . CAUTION: Refer to «Brake Dust Caution»(/cadillac/xlr/i-2003-2009/remont/oem-general-information/#cautions-and-notices__brake-dust-caution) .
5. Remove the tire and wheel assembly. Refer to «Tire and Wheel Removal and Installation»(/cadillac/xlr/i-2003-2009/remont/wheel-tire-system/#tires-and-wheels) .
6. Hand tighten a wheel lug nut to a wheel stud to secure the rotor to the hub.
7. Install 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 outboard brake pad.
8. Tighten the C-clamp evenly 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 caliper.
10. Remove the upper brake caliper guide pin bolt.
11. Pivot the brake caliper body downward and secure the caliper out of the way with heavy mechanic's wire or equivalent; ensure that there is no tension on the hydraulic brake flexible hose. Do NOT disconnect the hydraulic brake flexible hose from the caliper.
12. Remove the brake pads from the caliper bracket.
13. Remove and inspect the brake pad retainers from the caliper bracket.

Installation Procedure

1. Inspect the caliper slide boots for cuts, tears, or deterioration. If damaged, replace the slides and the boots. Refer to «Front Disc Brake Hardware Replacement»(/cadillac/xlr/i-2003-2009/remont/mechanical-hydraulic/#disc-brake-system) .
2. Install 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 inboard brake pad (2) or a wood block installed against the caliper pistons.
3. Tighten the C-clamp (1) evenly until the caliper pistons are compressed completely into the caliper bores.
4. Remove the C-clamp and the old brake pad or wood block from the caliper.
5. Install the brake pad retainers to the caliper bracket.
6. Install the brake pads to the caliper bracket. The brake pad wear sensor, mounted on the inboard brake pad, must be positioned so that it is in the leading bottom position during forward rotation of the brake rotor.
7. Pivot the brake caliper upward, over the brake pads and into the caliper bracket.
8. Install the upper brake caliper guide pin bolt. Tighten: Tighten the brake caliper guide pin bolt to 31 N.m (23 lb ft).
9. Install the tire and wheel assembly. Refer to «Tire and Wheel Removal and Installation»(/cadillac/xlr/i-2003-2009/remont/wheel-tire-system/#tires-and-wheels) .
10. Lower the vehicle.
11. With the engine OFF, gradually apply the brake pedal to approximately 2/3 of its travel distance.
12. Slowly release the brake pedal.
13. Wait 15 seconds, then repeat steps 11-12 until a firm brake pedal apply is obtained; this will properly seat the brake caliper pistons and brake pads.
14. Fill the brake master cylinder reservoir to the proper level. Refer to «Master Cylinder Reservoir Filling»(/cadillac/xlr/i-2003-2009/remont/mechanical-hydraulic/#hydraulic-brake-system__master-cylinder-reservoir-filling) .
15. Burnish the pads and rotors. Refer to «Brake Pad and Rotor Burnishing»(/cadillac/xlr/i-2003-2009/remont/mechanical-hydraulic/#disc-brake-system__brake-pad-and-rotor-burnishing) .

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. Raise and suitably support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/xlr/i-2003-2009/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) .
4. Remove the tire and wheel assembly. Refer to «Tire and Wheel Removal and Installation»(/cadillac/xlr/i-2003-2009/remont/wheel-tire-system/#tires-and-wheels) . CAUTION: Refer to «Brake Dust Caution»(/cadillac/xlr/i-2003-2009/remont/oem-general-information/#cautions-and-notices__brake-dust-caution) .
5. Hand tighten a wheel lug nut to a wheel stud to secure the rotor to the hub.
6. 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 outboard brake pad.
7. 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.
8. Remove the C-clamp from the caliper.
9. Remove the brake caliper guide pin bolts.
10. Remove the brake caliper from the caliper bracket and support the caliper out of the way with heavy mechanic's wire or equivalent; ensure that there is no tension on the hydraulic brake flexible hose. Do NOT disconnect the hydraulic brake flexible hose from the caliper.
11. Remove the brake pads from the caliper bracket.
12. Remove and inspect the brake pad retainers from the caliper bracket.

1. Inspect the caliper slide boots for cuts, tears, or deterioration. If damaged, replace the slides and the boots. Refer to «Rear Disc Brake Hardware Replacement»(/cadillac/xlr/i-2003-2009/remont/mechanical-hydraulic/#disc-brake-system) .
2. 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 inboard brake pad (2) or a wood block installed against the caliper piston.
3. Tighten the C-clamp (1) until the caliper piston is compressed completely into the caliper bore.
4. Remove the C-clamp and the old brake pad or wood block from the caliper.
5. Install the brake pad retainers to the caliper bracket.
6. Install the brake pads to the caliper bracket. The brake pad wear sensor, mounted on the inboard brake pad, must be positioned so that it is in the leading bottom position during forward rotation of the brake rotor.
7. Install the brake caliper to the caliper bracket.
8. Install the brake caliper guide pin bolts. Tighten: Tighten the brake caliper guide pin bolts to 31 N.m (23 lb ft).
9. Install the tire and wheel assembly. Refer to «Tire and Wheel Removal and Installation»(/cadillac/xlr/i-2003-2009/remont/wheel-tire-system/#tires-and-wheels) .
10. Lower the vehicle.
11. With the engine OFF, gradually apply the brake pedal to approximately 2/3 of its travel distance.
12. Slowly release the brake pedal.
13. Wait 15 seconds, then repeat steps 11-12 until a firm brake pedal apply is obtained; this will properly seat the brake caliper pistons and brake pads.
14. Fill the brake master cylinder reservoir to the proper level. Refer to «Master Cylinder Reservoir Filling»(/cadillac/xlr/i-2003-2009/remont/mechanical-hydraulic/#hydraulic-brake-system__master-cylinder-reservoir-filling) .
15. Burnish the pads and rotors. Refer to «Brake Pad and Rotor Burnishing»(/cadillac/xlr/i-2003-2009/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). 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.

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 and suitably support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/xlr/i-2003-2009/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/xlr/i-2003-2009/remont/wheel-tire-system/#tires-and-wheels) .
6. Remove the brake caliper inlet fitting bolt from the caliper.
7. Remove the brake hose from the brake caliper.
8. Remove and discard the two copper brake hose gaskets. These gaskets may be stuck to the brake caliper and/or the brake hose end.
9. Plug the opening in the brake caliper and the brake hose to prevent fluid loss and contamination.
10. Remove the brake caliper guide pin bolts.
11. Remove the brake caliper from the caliper mounting bracket.

1. Inspect the caliper slide boots for cuts, tears, or deterioration. If damaged, replace the slides and the boots. Refer to «Front Disc Brake Hardware Replacement»(/cadillac/xlr/i-2003-2009/remont/mechanical-hydraulic/#disc-brake-system) .
2. Install the brake caliper to the caliper mounting bracket.
3. Install the brake caliper guide pin bolts. Tighten: Tighten the brake caliper guide pin bolts to 31 N.m (23 lb ft).
4. Remove the plug from the brake caliper opening and the brake hose.
5. Assemble the NEW copper brake hose gaskets, and the brake caliper inlet fitting bolt to the brake hose.
6. Install the brake hose and the brake caliper inlet fitting bolt to the brake caliper. Tighten: Tighten the brake caliper inlet fitting bolt to 45 N.m (33 lb ft).
7. Bleed the hydraulic brake system. Refer to «Hydraulic Brake System Bleeding (Manual)»(/cadillac/xlr/i-2003-2009/remont/mechanical-hydraulic/#hydraulic-brake-system) or «Hydraulic Brake System Bleeding (Pressure)»(/cadillac/xlr/i-2003-2009/remont/mechanical-hydraulic/#hydraulic-brake-system) .
8. Install the tire and wheel assembly. Refer to «Tire and Wheel Removal and Installation»(/cadillac/xlr/i-2003-2009/remont/wheel-tire-system/#tires-and-wheels) .
9. Lower the vehicle.

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 and suitably support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/xlr/i-2003-2009/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/xlr/i-2003-2009/remont/wheel-tire-system/#tires-and-wheels) .
6. Remove the brake caliper inlet fitting bolt from the caliper.
7. Remove the brake hose from the brake caliper.
8. Remove and discard the two copper brake hose gaskets. These gaskets may be stuck to the brake caliper and/or the brake hose end.
9. Plug the opening in the brake caliper and the brake hose to prevent fluid loss and contamination.
10. Remove the brake caliper guide pin bolts.
11. Remove the brake caliper from the caliper mounting bracket.

1. Inspect the caliper slide boots for cuts, tears, or deterioration. If damaged, replace the slides and the boots. Refer to «Rear Disc Brake Hardware Replacement»(/cadillac/xlr/i-2003-2009/remont/mechanical-hydraulic/#disc-brake-system) .
2. Install the brake caliper to the caliper mounting bracket.
3. Install the brake caliper guide pin bolts. Tighten: Tighten the brake caliper guide pin bolts to 31 N.m (23 lb ft).
4. Remove the plug from the brake caliper opening and the brake hose.
5. Assemble the NEW copper brake hose gaskets, and the brake caliper inlet fitting bolt to the brake hose.
6. Install the brake hose and the brake caliper inlet fitting bolt to the brake caliper. Tighten: Tighten the brake caliper inlet fitting bolt to 45 N.m (33 lb ft).
7. Bleed the hydraulic brake system. Refer to «Hydraulic Brake System Bleeding (Manual)»(/cadillac/xlr/i-2003-2009/remont/mechanical-hydraulic/#hydraulic-brake-system) or «Hydraulic Brake System Bleeding (Pressure)»(/cadillac/xlr/i-2003-2009/remont/mechanical-hydraulic/#hydraulic-brake-system) .
8. Install the tire and wheel assembly. Refer to «Tire and Wheel Removal and Installation»(/cadillac/xlr/i-2003-2009/remont/wheel-tire-system/#tires-and-wheels) .
9. Lower the vehicle.

Front Brake Caliper Overhaul (JL9-J55)

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

1. Remove the front brake caliper from the vehicle. Refer to «Front Brake Caliper Replacement»(/cadillac/xlr/i-2003-2009/remont/mechanical-hydraulic/#disc-brake-system) .
2. Remove the brake caliper pistons from the caliper bore by directing low pressure compressed air into the caliper bore through the fluid inlet hole.
3. Using a small wooden or plastic tool, remove the piston dust boot seals from the seal counterbores in the caliper and discard the boot seals.
4. Using a small wooden or plastic tool, remove the piston seals from the caliper bores and discard the piston seals.
5. Remove the bleeder valve and cap from the caliper.
6. Clean the brake caliper piston bores and seal counterbores, and the caliper pistons with denatured alcohol, or equivalent.
7. Dry the caliper piston bores and counterbores, and the pistons with non-lubricated, filtered compressed air.
8. Inspect the caliper bores for cracks, scoring, pitting, excessive rust, and/or excessive corrosion.
9. If light rust or light corrosion are present in the caliper bores, attempt to remove the imperfection with a fine emery paper. If the imperfection cannot be removed, replace the caliper assembly.
10. If cracks, scoring, pitting, excessive rust, and/or excessive corrosion are present in the caliper bores, replace the caliper assembly.
11. Inspect the caliper pistons for cracks, scoring, and/or damage to the chrome plating. Replace the caliper pistons if any of these conditions exist.
12. Lubricate the new piston seals with Delco Supreme 11® GM P/N 12377967 (Canadian P/N 992667), or equivalent DOT-3 brake fluid from a clean, sealed brake fluid container.
13. Install the lubricated, new piston seals into the caliper bores.
14. Install the new piston dust boot seal over the piston.
15. Install the caliper pistons into the caliper bores. Install the boots over the ends of the pistons so that the fold will face toward the brake caliper housing piston bore openings. Seat the boots into the brake caliper bore grooves and slide the pistons into the brake caliper bores. Push the pistons down to the bottom of the brake caliper bores. Make sure the boots are properly seated into the piston grooves and into the groove in the brake caliper bores.
16. Install the caliper bleed screw. Tighten: Tighten the caliper bleed screw to 12 N.m (106 lb in).
17. Install the caliper bleed screw cap.
18. Install the caliper to the vehicle. Refer to «Front Brake Caliper Replacement»(/cadillac/xlr/i-2003-2009/remont/mechanical-hydraulic/#disc-brake-system) .

Rear Brake Caliper Overhaul (JL9-J55)

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

1. Remove the rear brake caliper from the vehicle. Refer to «Rear Brake Caliper Replacement»(/cadillac/xlr/i-2003-2009/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 bore through the fluid inlet hole.
3. Using a small wooden or plastic tool, remove the piston dust boot seal (2) from the seal counterbore in the caliper (1) and discard the boot seal.
4. Using a small wooden or plastic tool, remove the piston seal (4) from the caliper bore and discard the piston seal.
5. Remove the bleeder valve (5) and cap (6) from the caliper (1).
6. Clean the brake caliper piston bore and seal counterbore, and the caliper piston with denatured alcohol, or equivalent.
7. Dry the caliper piston bore and counterbore, and the piston with non-lubricated, filtered compressed air.
8. Inspect the caliper bore for cracks, scoring, pitting, excessive rust, and/or excessive corrosion.
9. 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.
10. If cracks, scoring, pitting, excessive rust, and/or excessive corrosion are present in the caliper bore, replace the caliper assembly.
11. Inspect the caliper piston for cracks, scoring, and/or damage to the chrome plating. Replace the caliper piston if any of these conditions exist.
12. Lubricate the new piston seal with Delco Supreme 11® GM P/N 12377967 (Canadian P/N 992667), or equivalent DOT-3 brake fluid from a clean, sealed brake fluid container.
13. Install the lubricated, new piston seal into the caliper bore.
14. Install the new piston dust boot seal over the piston.
15. Install the caliper piston into the caliper bore. Install the boot over the end of the piston so that the fold will face toward the brake caliper housing piston bore opening. Seat the boot into the brake caliper bore groove and slide the piston into the brake caliper bore. Push the piston down to the bottom of the brake caliper bore. Make sure the boot are properly seated into the piston groove and into the groove in the brake caliper bore.
16. Install the caliper bleed screw. Tighten: Tighten the caliper bleed screw to 12 N.m (106 lb in).
17. Install the caliper bleed screw cap.
18. Install the caliper to the vehicle. Refer to «Rear Brake Caliper Replacement»(/cadillac/xlr/i-2003-2009/remont/mechanical-hydraulic/#disc-brake-system) .

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»(/cadillac/xlr/i-2003-2009/remont/mechanical-hydraulic/#disc-brake-system) .
2. Remove the brake pads (2) from the brake caliper bracket.
3. Remove the brake pad retainers (1) from the brake caliper bracket.
4. Remove the caliper pins (5) from the disc brake caliper mounting bracket (3).
5. Remove the caliper pin boots (4) from the disc brake caliper mounting bracket.
6. Lightly wire brush all brake pad contact areas in order to remove any corrosion.

1. Install the caliper pin boots (4) to the disc brake caliper mounting bracket.
2. Lubricate the caliper pins (5) with high temperature silicone lubricant.
3. Install the caliper pins to the disc brake caliper mounting bracket (3).
4. Install the brake pad retainers (1) to the caliper bracket.
5. Install the brake pads (2) to the caliper bracket.
6. Install the disc brake caliper to the mounting bracket. NOTE: Refer to «Fastener Notice»(/cadillac/xlr/i-2003-2009/remont/oem-general-information/#cautions-and-notices__fastener-notice) .
7. Install the disc brake caliper bolts. Tighten: Tighten the disc brake caliper bolts to 31 N.m (23 lb ft). Apply and release the brake pedal 3/4 stroke as many times as necessary in order to obtain a firm brake pedal.

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 «Rear Brake Caliper Replacement»(/cadillac/xlr/i-2003-2009/remont/mechanical-hydraulic/#disc-brake-system) .
2. Remove the brake pads (2) from the brake caliper bracket.
3. Remove the brake pad retainers (1) from the brake caliper bracket.
4. Remove the caliper pins (5) from the disc brake caliper mounting bracket (3).
5. Remove the caliper pin boots (4) from the disc brake caliper mounting bracket.
6. Lightly wire brush all brake pad contact areas in order to remove any corrosion.

1. Install the caliper pin boots (4) to the disc brake caliper mounting bracket.
2. Lubricate the caliper pins (5) with high temperature silicone lubricant.
3. Install the caliper pins to the disc brake caliper mounting bracket (3).
4. Install the brake pad retainers (1) to the caliper bracket.
5. Install the brake pads (2) to the caliper bracket.
6. Install the disc brake caliper to the mounting bracket. NOTE: Refer to «Fastener Notice»(/cadillac/xlr/i-2003-2009/remont/oem-general-information/#cautions-and-notices__fastener-notice) .
7. Install the disc brake caliper bolts. Tighten: Tighten the disc brake caliper bolts to 31 N.m (23 lb ft). Apply and release the brake pedal 3/4 stroke as many times as necessary in order to obtain a firm brake pedal.

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»(/cadillac/xlr/i-2003-2009/remont/mechanical-hydraulic/#disc-brake-system) .
2. Remove the brake pads (2) from the brake caliper bracket (3).
3. Remove the brake pad retainers (1) from the brake caliper bracket (3).
4. Remove the brake caliper mounting bracket bolts and washers.
5. Discard the brake caliper mounting bracket bolts.
6. Remove the brake caliper mounting bracket from the knuckle.
7. Inspect the brake caliper bracket.
8. Replace the brake caliper bracket if cracked or damaged.
9. Clean all the bolt adhesive residue from the brake caliper mounting bracket and the knuckle mating surfaces.

1. Install the brake caliper mounting bracket to the knuckle.
2. Install the 2 NEW brake caliper mounting bracket bolts and washers. The new brake caliper mounting bracket bolts will come with an adhesive already applied to the threads. Tighten: Tighten the front brake caliper mounting bracket bolts to 175 N.m (125 lb ft).
3. Lubricate the brake caliper pin bolts with high temperature silicone lubricant.
4. Install the brake pad retainers (1) to the brake caliper bracket (3).
5. Install the brake pads (2) to the brake caliper bracket (3).
6. Install the brake caliper. Refer to «Front Brake Caliper Replacement»(/cadillac/xlr/i-2003-2009/remont/mechanical-hydraulic/#disc-brake-system) .

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 «Rear Brake Caliper Replacement»(/cadillac/xlr/i-2003-2009/remont/mechanical-hydraulic/#disc-brake-system) .
2. Remove the brake pads (1) from the brake caliper bracket (3).
3. Remove the brake pad retainers (2) from the brake caliper bracket (3).
4. Remove the brake caliper bracket bolts (1) and discard.
5. Remove the brake caliper bracket.
6. Inspect the brake mounting and hardware. Refer to «Rear Disc Brake Mounting and Hardware Inspection»(/cadillac/xlr/i-2003-2009/remont/mechanical-hydraulic/#disc-brake-system__rear-disc-brake-mounting-and-hardware) .
7. Inspect the brake caliper bracket for cracks or damage.
8. Replace the brake caliper bracket if cracked or damaged.
9. Clean all the bolt adhesive residue from the brake caliper mounting bracket and the knuckle mating surfaces.

1. Install the brake caliper bracket to the suspension knuckle.
2. Install the two NEW brake caliper mounting bracket bolts (1) and washers. The new brake caliper mounting bracket bolts will come with an adhesive already applied to the threads. Tighten: Tighten the brake caliper mounting bracket bolts to 175 N.m (125 lb ft).
3. Lubricate the brake caliper pin bolts with high temperature silicone lubricant.
4. Install the brake pad retainers (2) to the brake caliper bracket (3).
5. Install the brake pads (1) to the brake caliper bracket (3).
6. Install the brake caliper. Refer to «Rear Brake Caliper Replacement»(/cadillac/xlr/i-2003-2009/remont/mechanical-hydraulic/#disc-brake-system) .

Front Brake Rotor Replacement

Tools Required

1. J 41013 Rotor Resurfacing Kit. See «Special Tools»(/cadillac/xlr/i-2003-2009/remont/mechanical-hydraulic/#disc-brake-system__special-tools) .
2. J 42450-A Wheel Hub Resurfacing Kit. See «Special Tools»(/cadillac/xlr/i-2003-2009/remont/mechanical-hydraulic/#disc-brake-system__special-tools) .

1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/xlr/i-2003-2009/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) .
2. Remove the tire and wheel assembly. «Tire and Wheel Removal and Installation»(/cadillac/xlr/i-2003-2009/remont/wheel-tire-system/#tires-and-wheels) .
3. 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.
4. Using the C-clamp, compress the piston into the caliper bore just enough to allow the caliper to slide away from the rotor.
5. Remove the C-clamp.
6. Remove the caliper bracket bolts. Do not disconnect the brake flexible hose bolt. 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»(/cadillac/xlr/i-2003-2009/remont/mechanical-hydraulic/#disc-brake-system) .
7. Matchmark the position of the brake rotor to the wheel studs.
8. Remove the brake rotor.

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/xlr/i-2003-2009/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/xlr/i-2003-2009/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/xlr/i-2003-2009/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/xlr/i-2003-2009/remont/mechanical-hydraulic/#disc-brake-system__brake-rotor-assembled-lateral-runout-correction) .
7. Install the brake caliper and the brake caliper bracket as an assembly to the suspension knuckle. Refer to «Front Brake Caliper Bracket Replacement»(/cadillac/xlr/i-2003-2009/remont/mechanical-hydraulic/#disc-brake-system) .
8. Install the tire and wheel assembly. Refer to «Tire and Wheel Removal and Installation»(/cadillac/xlr/i-2003-2009/remont/wheel-tire-system/#tires-and-wheels) .
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/xlr/i-2003-2009/remont/mechanical-hydraulic/#disc-brake-system__brake-pad-and-rotor-burnishing) .

Rear Brake Rotor Replacement

Tools Required

1. J 2619-01 Slide Hammer with Adapter. See «Special Tools»(/cadillac/xlr/i-2003-2009/remont/mechanical-hydraulic/#disc-brake-system__special-tools) .
2. J 41013 Rotor Resurfacing Kit. See «Special Tools»(/cadillac/xlr/i-2003-2009/remont/mechanical-hydraulic/#disc-brake-system__special-tools) .
3. J 42450-A Wheel Hub Resurfacing Kit. See «Special Tools»(/cadillac/xlr/i-2003-2009/remont/mechanical-hydraulic/#disc-brake-system__special-tools) .
4. J-46277 Rotor Removal Tool. See «Special Tools»(/cadillac/xlr/i-2003-2009/remont/mechanical-hydraulic/#disc-brake-system__special-tools) .

1. Check to be sure that the park brake is released.
2. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/xlr/i-2003-2009/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) .
3. Remove the tire and wheel assembly. Refer to «Tire and Wheel Removal and Installation»(/cadillac/xlr/i-2003-2009/remont/wheel-tire-system/#tires-and-wheels) .
4. Disconnect the park brake cable from the park brake apply lever.
5. 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.
6. Using the C-clamp, compress the piston into the caliper bore just enough to allow the caliper to slide away from the rotor.
7. Remove the C-clamp.
8. Remove the caliper bracket bolts. Do not disconnect the brake flexible hose bolt.
9. 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 «Rear Brake Caliper Bracket Replacement»(/cadillac/xlr/i-2003-2009/remont/mechanical-hydraulic/#disc-brake-system) .
10. Matchmark the position of the brake rotor to the wheel studs.
11. Remove the brake rotor. Do not force the rotor off. If the rotor is difficult to remove, ease it off by gently rotating it as you pull outward.
12. If the rear brake cannot be removed, perform the following: Assemble J-46277 to J 2619-01 . See «Special Tools»(/cadillac/xlr/i-2003-2009/remont/mechanical-hydraulic/#disc-brake-system__special-tools) . Insert J-46277 between the rotor friction surfaces in the vent section of the rotor. See «Special Tools»(/cadillac/xlr/i-2003-2009/remont/mechanical-hydraulic/#disc-brake-system__special-tools) . DO NOT place the J-46277 on the rotor friction surface. See «Special Tools»(/cadillac/xlr/i-2003-2009/remont/mechanical-hydraulic/#disc-brake-system__special-tools) . Using the J-46277 and J 2619-01 , remove the rotor from the hub assembly. See «Special Tools»(/cadillac/xlr/i-2003-2009/remont/mechanical-hydraulic/#disc-brake-system__special-tools) . Inspect the park brake components for the following conditions: Bent or broken hold down spring Broken, cracked or worn brake shoe lining Bent or damaged brake shoe Worn, bent or damaged backing plate Replace any defective parts found.

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/xlr/i-2003-2009/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/xlr/i-2003-2009/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. Connect the park brake cable to the park brake lever.
5. Adjust the clearance of the park brake shoe to the drum-in-hat portion of the brake rotor. Refer to «Park Brake Adjustment»(/cadillac/xlr/i-2003-2009/remont/parking-brake-system/#parking-brake__park-brake-adjustment) .
6. Install the brake rotor to the hub/axle flange. Use the matchmark made prior to removal for proper orientation to the flange.
7. 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/xlr/i-2003-2009/remont/mechanical-hydraulic/#disc-brake-system__brake-rotor-assembled-lateral-runout-measurement) .
8. 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/xlr/i-2003-2009/remont/mechanical-hydraulic/#disc-brake-system__brake-rotor-assembled-lateral-runout-correction) .
9. Install the brake caliper and the brake caliper bracket as an assembly to the suspension knuckle. Refer to «Rear Brake Caliper Bracket Replacement»(/cadillac/xlr/i-2003-2009/remont/mechanical-hydraulic/#disc-brake-system) .
10. Install the tire and wheel assembly. Refer to «Tire and Wheel Removal and Installation»(/cadillac/xlr/i-2003-2009/remont/wheel-tire-system/#tires-and-wheels) .
11. Lower the vehicle.
12. 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/xlr/i-2003-2009/remont/mechanical-hydraulic/#disc-brake-system__brake-pad-and-rotor-burnishing) .

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/xlr/i-2003-2009/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/xlr/i-2003-2009/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/xlr/i-2003-2009/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

Tools Required

1. J 39544-KIT Torque-Limiting Socket Set, or equivalent. See «Special Tools»(/cadillac/xlr/i-2003-2009/remont/mechanical-hydraulic/#disc-brake-system__special-tools) .
2. J 45101-100 Conical Brake Rotor Washers. See «Special Tools»(/cadillac/xlr/i-2003-2009/remont/mechanical-hydraulic/#disc-brake-system__special-tools) .

1. Remove the J 45101-100 and the lug nuts that were installed during the assembled LRO measurement procedure. See «Special Tools»(/cadillac/xlr/i-2003-2009/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 uppermost wheel stud. See «Special Tools»(/cadillac/xlr/i-2003-2009/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/xlr/i-2003-2009/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/xlr/i-2003-2009/remont/mechanical-hydraulic/#disc-brake-system__special-tools) . Refer to «Tire and Wheel Removal and Installation»(/cadillac/xlr/i-2003-2009/remont/wheel-tire-system/#tires-and-wheels) .
8. Measure the assembled LRO of the brake rotor. Refer to «Brake Rotor Assembled Lateral Runout Measurement»(/cadillac/xlr/i-2003-2009/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/xlr/i-2003-2009/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/xlr/i-2003-2009/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/xlr/i-2003-2009/remont/mechanical-hydraulic/#disc-brake-system__special-tools) .
2. J 45101-100 Conical Brake Rotor Washers. See «Special Tools»(/cadillac/xlr/i-2003-2009/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/xlr/i-2003-2009/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 uppermost wheel stud. See «Special Tools»(/cadillac/xlr/i-2003-2009/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/xlr/i-2003-2009/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/xlr/i-2003-2009/remont/mechanical-hydraulic/#disc-brake-system__special-tools) . Refer to «Tire and Wheel Removal and Installation»(/cadillac/xlr/i-2003-2009/remont/wheel-tire-system/#tires-and-wheels) .
12. Measure the assembled LRO of the brake rotor. Refer to «Brake Rotor Assembled Lateral Runout Measurement»(/cadillac/xlr/i-2003-2009/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/xlr/i-2003-2009/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/xlr/i-2003-2009/remont/mechanical-hydraulic/#disc-brake-system__special-tools) .

Brake Rotor Assembled Lateral Runout Correction - On Vehicle Lathe

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/xlr/i-2003-2009/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»(/cadillac/xlr/i-2003-2009/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/xlr/i-2003-2009/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/xlr/i-2003-2009/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/xlr/i-2003-2009/remont/mechanical-hydraulic/#disc-brake-system__special-tools) .

Brake Rotor Refinishing

Tools Required

1. J 41013 Rotor Resurfacing Kit. See «Special Tools»(/cadillac/xlr/i-2003-2009/remont/mechanical-hydraulic/#disc-brake-system__special-tools) .
2. J 42450-A Wheel Hub Resurfacing Kit. See «Special Tools»(/cadillac/xlr/i-2003-2009/remont/mechanical-hydraulic/#disc-brake-system__special-tools) .

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/xlr/i-2003-2009/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/xlr/i-2003-2009/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, remount 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/xlr/i-2003-2009/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. 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/xlr/i-2003-2009/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/xlr/i-2003-2009/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

Special Tools Illustration Tool Number/Description J 2619-01 Slide Hammer J 39544-KIT Complete Torque Limiting Socket Set - 10 PCS 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 46277 Rotor Removal Tool

Scheme 8

Scheme 9

Scheme 10

Scheme 11

Scheme 12

Scheme 13

Scheme 14

See also:
• Diagnostic Starting Point - Hydraulic Brakes
• Brake Dust Caution
• Tire and Wheel Removal and Installation
• Brake Fluid Irritant Caution
• Lifting and Jacking the Vehicle
• Fastener Notice
• Master Cylinder Reservoir Filling
• Brake Fluid Effects on Paint and Electrical Components Notice
• Hydraulic Brake System Bleeding (Manual)
• Park Brake Adjustment
• Front Disc Brake Pads Replacement
• 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
• Rear Disc Brake Mounting and Hardware Inspection
• Brake Rotor Assembled Lateral Runout Measurement
• Brake Rotor Thickness Measurement