Rear Brake Caliper Overhaul

Single Use Fasteners and Components Rear Brake Caliper Piston Boot Rear Brake Cylinder Piston Seal Rear Brake Washer [2x] Rear Parking Brake Actuator Lever Seal

Warning

The battery must be disconnected to prevent the brake master cylinder from pressurizing the hydraulic system during its automated self diagnostic tests that can possibly occur when a door is opened or the key transmitter is activated. Failure to follow this precaution may cause personal injury.

Warning

Brake Dust Warning

Warning

Brake Fluid Irritant Warning Removal Procedure Remove the rear brake caliper. Rear Brake Caliper Replacement Disassembly Procedure

Warning

Do not place fingers in front of the caliper piston(s) in an attempt to catch or protect it when applying compressed air. The piston(s) can fly out with force and could result in serious bodily injury.

Rear Brake Caliper Overhaul — figure 1

Caution

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.

1. Remove the rear brake caliper piston (1) from the caliper bore by directing low pressure compressed air into the caliper bore through the brake hose inlet port.
2. Using a plastic tool, remove and DISCARD the rear brake caliper piston boot (2).
3. Using a plastic tool, remove and DISCARD the rear brake cylinder piston seal (3).
4. Rear Brake Bleeder Valve Cap » Remove

Rear Brake Caliper Overhaul — figure 2

5. Rear Brake Bleeder Valve (1) » Remove

Note

Do not remove park brake piston apply spindle, washer or washer bearing.

6. Clean the brake caliper piston bore with denatured alcohol, or equivalent.

7. Inspect the caliper bore for cracks, scoring, pitting and corrosion.

8. If cracks, scoring, pitting or corrosion exists, replace the brake caliper. Assembly Procedure

9. Lubricate the rear brake cylinder piston seal (3) with GM approved brake fluid from a clean, sealed brake fluid container. Adhesives, Fluids, Lubricants, and Sealers

10. Install the NEW rear brake cylinder piston seal (3) into the brake caliper housing groove. Ensure the rear brake cylinder piston seal is properly seated in the caliper housing groove and is not distorted.

11. Install the NEW rear brake caliper piston boot (2) into the brake caliper housing dust boot groove on the piston.

12. Install the rear brake caliper piston (1) in the brake caliper housing body aligning the park brake spindle nut flat features with corresponding flat features inside piston hollow so when the rear brake cylinder piston (1) is pressed into the bore the spindle nut and piston mate.

13. Install the rear brake caliper piston boot into the rear brake caliper housing.

14. Fully seat the rear brake caliper piston (1) into the brake caliper bore.

Rear Brake Caliper Overhaul — figure 3

7. Rotate the rear brake caliper piston (1) in bore to align piston face slots so they are perpendicular to a line between the caliper housing mounting holes.

8. Rear Brake Bleeder Valve (1) » Install and hand tighten

9. Rear Brake Bleeder Valve Cap » Install Installation Procedure Install the rear brake caliper. Rear Brake Caliper Replacement