Caliper Overhaul
1. Remove caliper completely from vehicle
2. Clean outside of caliper, then drain brake fluid from caliper.
WARNING: Do not place fingers in front of piston for any reason when applying compressed air. This could result in serious personal injury.
Fig. 6 Applying Compressed Air To Caliper Line Port:
Disc Brake Caliper Assembly:
3. Use clean shop towels to pad interior of caliper assembly, then remove piston by directing compressed air into caliper brake hose inlet hole. Use just enough air pressure to ease piston out of bore.
4. Remove piston (9) from the caliper.
INSPECT
^ Piston for scoring, nicks, corrosion and worn or damaged chrome plating. Replace piston if any of these conditions are found.
Removing Boot:
5. Remove boot (6) from caliper housing bore. Be careful not to scratch housing bore.
CAUTION: Do not use a metal tool to remove piston seal. This may damage caliper bore or seal groove.
Caliper Assembly:
6. Remove piston seal (10) from seal groove in caliper housing (12) bore with a small wood or plastic tool.
INSPECT
^ Caliper housing bore and seal groove for scoring, nicks, corrosion and wear.
7. Use crocus cloth to polish out light corrosion. Replace caliper housing if corrosion in and around seal groove will not clean up with crocus cloth.
8. Remove bleeder valve (11) from caliper.
9. Clean all parts in clean, denatured alcohol. Dry with unlubricated compressed air.
10. Blow out all passages in caliper housing and bleeder valve.
ASSEMBLY
1. Install bleeder valve into caliper.
2. Tighten bleeder valve to 13 Nm (10 lbs. ft.)
3. Lubricate all rubber parts with clean brake fluid prior to installation.
4. Install piston seal (10) into caliper seal groove. Be sure seal is not twisted.
Installing Boot Onto Piston:
5. Install boot onto piston.
6. Install piston and boot into bore of caliper and push to bottom of bore.
Seating Boot Into Caliper Housing:
7. Seat boot in caliper housing counterbore using J 29077-A or equivalent.
8. Install caliper. Refer to Caliper Installation.
1. Remove caliper completely from vehicle
2. Clean outside of caliper, then drain brake fluid from caliper.
WARNING: Do not place fingers in front of piston for any reason when applying compressed air. This could result in serious personal injury.
3. Remove piston (5) from the caliper.
4. Use clean shop towels to pad interior of caliper assembly (10,) then remove piston by directing compressed air into caliper brake hose inlet hole. Use just enough air pressure to ease piston out of bore.
INSPECT
^ Piston (5) for scoring, nicks, corrosion and worn or damaged chrome plating. Replace piston (5) if any of these conditions are found.
5. Remove boot (6) from caliper housing bore. Be careful not to scratch housing bore.
CAUTION: Do not use a metal tool to remove piston seal in step 6. This may damage caliper bore or seal groove.
6. Remove piston seal (4) from seal groove (16) in caliper housing (10) bore with a small wood or plastic tool.
INSPECT
^ Caliper housing (10) bore and seal groove (16) for scoring, nicks, corrosion and wear.
7. Use crocus cloth to polish out light corrosion. Replace caliper housing if corrosion in and around seal groove will not clean up with crocus cloth.
8. Remove bleeder valve (3) from caliper (1).
9. Clean all parts in clean, denatured alcohol. Dry with unlubricated compressed air.
10. Blow out all passages in caliper housing (10) and bleeder valve (3).
Seating Boot Into Caliper Housing:
Caliper Assembly:
ASSEMBLY
1. Install bleeder valve (3) into caliper (10).
2. Tighten bleeder valve (3) to 13 Nm (115 lbs. in.)
3. Lubricate all rubber parts with clean brake fluid prior to installation.
4. Install piston seal (4) into caliper seal groove (16). Be sure seal is not twisted.
5. Install boot (6) onto piston (5).
6. Install piston (5) and boot (6) into bore of caliper and push to bottom of bore.
7. Seat boot (6) in caliper housing (10) counterbore using J 29077-A or equivalent.
8. Install bushings (2).
9. Lubricate beveled end of bushing with silicone grease, GM Part Number 1052863 or equivalent.
10. Pinch bushing and install bevel end first through housing mounting bore.
11. Install caliper.