Brake Caliper Overhaul - Front
Brake Caliper Overhaul - FrontDisassembly Procedure
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.
1. Remove the brake caliper from the vehicle.
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 plastic or wooden tool, remove the piston boots (2).
4. Using a plastic or wooden tool, remove the piston seals (1).
5. Remove the brake caliper bleeder valve cap.
6. Remove the brake caliper bleeder valve (1).
7. Inspect the brake caliper bores and piston seal grooves for scoring and corrosion. If badly scored or corroded around the piston seal area, replace the brake caliper housing.
8. inspect the Brake Caliper mounting guide surfaces for corrosion and wear. Remove and replace the brake caliper mounting bracket it necessary.
9. Clean all the residue from the brake pad guiding surfaces on the brake caliper housing and the mounting bracket.
Important: Do not use abrasive to clean the brake Caliper piston.
10. Clean all the parts not included in the repair kit with denatured alcohol.
11. Dry all the parts with filtered non lubricated, filtered compressed air.
12. Blow out all passages in the brake caliper housing and the brake caliper bleeding valve.
13. Inspect the caliper bores for cracks, scoring, pitting, excessive rust, and/or excessive corrosion.
14. If light rust or 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.
Assembly Procedure
Notice: Refer to Fastener Notice in Service Precautions.
1. Install the brake caliper bleeder valve (1).
^ Tighten the brake caliper bleeder valve to 12 Nm (106 lb in)
2. Install the brake caliper bleeder valve cap.
3. Lubricate the new piston seals with Delco Supreme 111 GM P/N 12377967 Canada P/N 992667 or equivalent, DOT-3 brake fluid from a clean, sealed brake fluid container.
4. Install new seals (1) into the brake caliper bore seal grooves.
5. Make sure the seals are not twisted.
6. Lubricate the brake caliper bores and the pistons with brake fluid.
7. Install the boot (2) and piston (3).
7.1. Install the boot over the end of the piston so that the fold will face toward the brake caliper housing piston bore opening.
7.2. Seat the boot into the brake caliper bore groove and slide the piston into the brake caliper bore.
7.3. Push down the piston to the bottom of the brake caliper bore.
7.4. Make sure the boot is properly seated into the piston groove and into the groove in the brake caliper bore.
7.5. Repeat steps 5 and 6 for the remaining piston.
8. Install the brake caliper to the vehicle.