Brake Caliper Overhaul

Disassembly Procedure





1. Remove the caliper completely from the vehicle. Refer to Brake Caliper Replacement.
2. Disassemble the bushings (6).
3. Inspect the bushings (6) for cuts and nicks. Replace the bushings (6) if damaged.





Caution: Do not place your fingers in front of the piston in order to catch or protect the piston while applying compressed air. This could result in serious Injury.

Important: Use clean shop towels in order to pad the interior of the caliper housing during the removal.

4. Remove the piston using compressed air into the caliper inlet hole.
5. Inspect the piston for the following conditions:
^ Scoring
^ Nicks
^ Corrosion
6. Replace the piston if any of these conditions are found.





7. Remove the boot (2) from the caliper housing bore. Be careful not to scratch the housing bore.

Notice: Do not use a metal tool for seal removal. Damage to the caliper bore or the seal grooves can result.

8. Remove the piston seal grove in the caliper housing bore with a small wood or plastic tool.
9. Inspect the caliper housing bore and seal groove for:
^ Scoring
^ Nicks
^ Corrosion and wear
10. Use a crocus cloth to polish out light corrosion.
11. Replace the caliper (1) if corrosion in and around the seal groove does not clean up with a crocus cloth.





12. Remove the bleeder valve (5) and bleeder valve cap from the caliper.
13. Clean all parts in clean, denatured alcohol.
14. Dry the parts with unlubricated compressed air.
15. Blow out all passages in the caliper housing and bleeder valve.

Assembly Procedure

^ Tools Required
- J 29077-A Front Disc Brake Caliper Dust Boot Installer





Notice: Refer to Fastener Notice in Service Precautions.

1. Assemble the bleeder valve (5) and bleeder valve cap into caliper.

^ Tighten the bleeder valve to 13 Nm (115 lb in).

2. Lubricate the new piston seal (2) and install the new piston seal into the caliper bore groove.
3. Ensure the seal (2) is not twisted.





4. Install the lubricated boot (2) onto the piston (1).
5. Install the piston and boot onto the bore of the caliper and push to the bottom of the bore.





6. Seat boot in the caliper housing counter bore (1) using J29077-A.
7. Perform the following steps in order to install the bushings:
7.1. Lubricate the beveled end of the bushing with silicone grease, GM P/N 1052863 or the equivalent.
7.2. Pinch the bushing and install the bevel end first.
7.3. Push the bushing through the housing mounting bore.
8. Install the caliper. Refer to Brake Caliper Replacement.