Brake Caliper Overhaul - Rear (J55)
Brake Caliper Overhaul - Rear (J55)Caution: Refer to Brake Dust Caution.
Caution: Refer to Brake Fluid irritant Caution.
Notice: Refer to Brake Fluid Effects on Paint and Electrical Components Notice.
Disassembly Procedure
1. Remove the rear brake caliper from the vehicle.
2. Drain all the brake fluid from the brake caliper.
3. Pad the interior of the caliper with clean shop towels.
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.
Notice: Use clean cloths to pad interior of caliper housing during piston removal. Use just enough air to ease the pistons out of the bores. If the pistons are blown out, even with the padding provided, it may be damaged.
4. Remove the brake caliper piston from the caliper bore by directing low pressure compressed air into the caliper bore through the fluid inlet hole.
Remove the piston from the brake caliper bore.
5. Using a small wooden or plastic tool, remove the piston dust boot seal from the seal counterbore in the caliper and discard the boot seal.
6. Using a small wooden or plastic tool, remove the piston seal from the caliper bore and discard the piston seal.
7. Remove the bleeder valve and bleeder valve cap from the caliper body.
8. Clean the following components with denatured alcohol or equivalent.
^ The bleeder valve
^ The caliper bore
^ The caliper passages
^ The piston
^ The lining contact area on the brake caliper bracket.
9. Dry the parts with non-lubricated, filtered air
10. Replace the piston or the caliper if any of the following conditions exist:
^ Scoring on the piston surface or in the caliper bore
^ Corrosion on the piston
^ Chrome plating damage on the piston
^ Corrosion in the caliper bore. Use crocus cloth in order to polish light corrosion from the caliper bore. Replace the caliper if the corrosion cannot be removed.
^ Pitting in the caliper bore
Notice: Refer to Fastener Notice.
11. Install the bleeder valve.
^ Tighten the bleeder valve to 13 Nm (115 lb in).
Assembly Procedure
1. 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.
2. Install the lubricated piston seal. Make sure the piston seal is not twisted in the caliper bore groove.
3. Install the boot into the caliper housing bore by hand.
4. Install the piston in the caliper bore. Push the piston to the bottom of the bore by hand.
5. Install the boot and retaining ring to the piston.
6. Install the caliper to the vehicle.