Caution: Refer to Brake Dust Caution in the Preface section.

Caution: Refer to Brake Fluid Irritant Caution in the Preface section.

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. Refer to Rear Brake Caliper Replacement .
2. Place a thin piece of wood in front of the piston in order to prevent damage. Remove the piston by directing compressed air into the brake hose inlet fitting port of the brake caliper housing.



3. Remove the piston boot.
4. Remove the piston seal.
5. Remove the brake caliper bleed screw cap.
6. Remove the brake caliper bleed screw.
7. Inspect the brake caliper bore and the piston seal groove for scoring and corrosion. If you find excessive scoring or corrosion around the piston seal area, replace the brake caliper housing.



8. Inspect the brake caliper mounting bracket guide surfaces for corrosion and wear. Remove and replace the brake caliper mounting bracket if needed.
9. Clean all the residue from the brake pad guiding surfaces on the brake caliper housing and the brake caliper mounting bracket.
10. Clean all the parts not included in the repair kit with denatured alcohol.
11. Dry all the parts with filtered unlubricated compressed air.
12. Blow out all passages in the brake caliper housing and the brake caliper bleeder valve.

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

1. Install the brake caliper bleed screw.

Tighten
Tighten the brake caliper bleed screw to 12 N·m (106 lb in).

2. Install the brake caliper bleed screw cap.
3. Lubricate the new piston seal and the brake caliper bore seal groove with brake fluid, GM P/N 12388967 (Canadian P/N 992667).
4. Install new the seal into the brake caliper bore seal groove.
5. Ensure that the seal is not twisted.
6. Lubricate the brake caliper bore and the piston with brake fluid, GM P/N 12388967 (Canadian P/N 992667).
7. Install the boot and the piston.

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. Slide the piston into the brake caliper bore.

7.3.	Push down the piston to the bottom of the brake caliper bore.

7.4.	Ensure that the boot properly seats 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. Refer to Rear Brake Caliper Replacement .