Overhaul

DISASSEMBLE





1. Remove caliper completely from vehicle.
2. Bushings. Inspect Bushings for cuts and nicks. Replace if damaged.

CAUTION: On the following procedure do not place fingers in front of the piston in an attempt to catch or protect it when applying compressed air. This could result in serious injury.

NOTE: Use clean shop towels to pad the interior of the caliper housing during removal.





3. Piston using compressed air into the caliper inlet hole. Inspect Piston for scoring, nicks, corrosion and worn or damaged chrome plating. Replace piston if any of these conditions are found.
4. Boot from caliper housing bore. Be careful not to scratch housing bore.





5. Piston seal from seal groove in caliper housing bore with a small wood or plastic tool.

NOTE: Do not use a metal tool since this may damage caliper bore or seal groove.

6. Inspect Caliper housing bore and seal groove for scoring, nicks, corrosion and wear. 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.
7. Bleeder valve and bleeder valve cap from caliper. Clean All parts in clean, denatured alcohol. Dry with unlubricated compressed air. Blow out all passages in caliper housing and bleeder valve.

ASSEMBLE
1. Bleeder valve and bleeder valve cap into caliper. Tighten Bleeder valve to 13 Nm (115 inch lbs.).





2. Lubricate new piston seal and install into caliper bore groove. Make sure seal is not twisted.
3. Lubricated boot onto piston.





4. Piston and boot into bore of caliper and push to bottom of bore.
5. Seat boot in caliper housing counter bore.
6. Bushings. Lubricate beveled end of bushing with silicone grease, GM P/N 1052863 or equivalent. Pinch bushing and install bevel end first. Push bushing through housing mounting bore.
7. Caliper.