Front Brake Caliper Overhaul (with RPO BRM)

Preliminary Procedure

1. Raise the vehicle. Refer to Lifting and Jacking the Vehicle .
2. Remove the front disc brake caliper. Refer to Front Brake Caliper Replacement .

Tighten:  10 N.m (89 lb in)

Procedure

1. Place a block of wood against the inside of the caliper body, opposite of the caliper piston, then direct low pressure compressed air through the caliper inlet port to remove the caliper piston. Repeat for each of the pistons, until all the pistons are removed from the caliper bores.
2. During installation apply a thin coat of brake and clutch fluid DOT-4 GM P/N 88958860 (Canadian P/N 88901244), or equivalent DOT-4 brake fluid from a clean, sealed brake fluid container onto the outer surface area of the caliper pistons.

• Wear eye protection while performing these steps.
• Do not use abrasives to clean the brake caliper piston or the disc brake caliper bore.

Procedure

1. Use a small wooden or plastic tool, carefully remove the rear disc brake caliper piston seal from the groove in the caliper seal bore.
2. During installation lubricate the new piston seals with brake and clutch fluid DOT-4 GM P/N 88958860 (Canadian P/N 88901244), or equivalent DOT-4 brake fluid from a clean, sealed brake fluid container.

Procedure

1. Inspect the caliper bore and housing for cracks, scoring, pitting, excessive rust, and/or excessive corrosion. If any of these conditions are present in the caliper bore or housing, replace the caliper assembly.
2. 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.
3. Clean the brake caliper piston bore and seal counterbore, the caliper piston, and the caliper sleeves with denatured alcohol, or equivalent.
4. Bleed the brake system anytime the system is opened for repairs. Refer to Hydraulic Brake System Bleeding (Manual without RPO BRM) or Hydraulic Brake System Bleeding (Manual with RPO BRM) or Hydraulic Brake System Bleeding (Pressure without RPO BRM) or Hydraulic Brake System Bleeding (Pressure with RPO BRM) .