Brake Caliper Overhaul
Brake Caliper Overhaul^ Tools Required
- J 24548 Piston Ring Compressor
- J 36474 75 mm Boot Seal Installer
- J 36475 80 mm Boot Seal Installer
- J 38453 86 mm Boot Seal Installer
Removal Procedure
1. Remove the front brake caliper from the vehicle.
2. Remove the brake caliper piston from the caliper bore by directing low pressure compressed air into the caliper bore through the fluid inlet hole.
3. Using a small wooden or plastic tool, remove the caliper piston seal (2) from the seal counterbore in the caliper (1) and discard the boot seal.
4. Using a small wooden or plastic tool, remove the piston seal (4) from the caliper bore and discard the piston seal.
5. Remove the bleeder valve (5) and cap (6) from the caliper (1).
Important: Do not use abrasives to clean the brake caliper piston.
6. Clean the brake caliper piston bore and seal counterbore, and the caliper piston with denatured alcohol, or equivalent.
7. Dry the caliper piston bore and counterbore, and the piston with non-lubricated, filtered air.
8. Inspect the caliper bore for cracks, scoring, pitting, excessive rust, and/or excessive corrosion.
9. If light rust or light corrosion are present in the caliper bore, attempt to remove the imperfection with a fine emery paper. If the imperfection cannot be removed, replace the caliper assembly.
10. If cracks, scoring, pitting, excessive rust, and/or excessive corrosion are present in the caliper bore, replace the caliper assembly.
11. Inspect the caliper piston for cracks, scoring, and/or damage to the finished surface area. Replace the caliper piston if any of these conditions exist.
Installation Procedure
1. Lubricate the new piston seal with Delco Supreme 11(R) (GM P/N 12377967) or equivalent DOT-3 brake fluid from a clean, sealed brake fluid container.
2. Install the lubricated, new piston seal into the caliper bore.
3. Install the piston and the boot into the caliper bore using J 24548.
4. Push the piston to the bottom of the bore.
5. Install the new piston dust boot seal over the piston.
6. Seat the boot housing using J 36474 or J 36475 or J 38453.
Notice: Refer to Fastener Notice in Service Precautions.
7. Install the front brake caliper bleeder valve.
Tighten the front brake caliper bleeder valve to 13 Nm (115 lb in).
8. Install the front brake caliper to the vehicle.