Rear Disc Brake Pads Replacement (JH9)

Rear Disc Brake Pads Replacement (JH9)

Removal Procedure

Warning: Refer to Brake Dust Warning Brake Dust Warning.


Note: Always replace disc brake pads in axle sets.

1. Inspect the fluid level in the brake master cylinder reservoir.

2. If the brake fluid level is midway between the maximum-full point and the minimum allowable level, no brake fluid needs to be removed from the reservoir before proceeding.

3. If the brake fluid level is higher than midway between the maximum-full point and the minimum allowable level, remove brake fluid to the midway point before proceeding.

4. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle Service and Repair.

5. Remove the tire and wheel assembly. Refer to Tire and Wheel Removal and Installation Service and Repair.

6. Position a large C-clamp against the outboard disc brake pad backing plate and over the rear of the brake caliper body.

7. Using the C-clamp, slowly and evenly bottom the brake caliper pistons into the brake caliper bores.





Note: Do not remove the brake caliper guide pins unless replacement is required.

8. Remove the brake caliper bracket bolts (1).





Caution:
Support the brake caliper with heavy mechanic wire, or equivalent, whenever it is separated from its mount and the hydraulic flexible brake hose is still connected. Failure to support the caliper in this manner will cause the flexible brake hose to bear the weight of the caliper, which may cause damage to the brake hose and in turn may cause a brake fluid leak.

9. Remove the brake caliper and bracket assembly (1) and support with heavy mechanics wire or equivalent.




10. Remove the outer brake pad (1).

11. Remove the inner brake pad (2).




12. Remove the brake pad springs (1).

13. Clean the brake pad springs contact areas of the brake caliper bracket of any accumulated corrosion and debris.

Installation Procedure




1. Ensure the brake caliper guide pin caps (1) are in good condition and firmly seated on the brake caliper body.
Replace any missing or damaged brake caliper guide pin caps.

2. Without disengaging the brake caliper from the brake caliper guide pins, inspect the brake caliper hardware. Refer to Rear Disc Brake Mounting and Hardware Inspection (With Single Rear Wheel) Rear Disc Brake Mounting and Hardware Inspection (With Single Rear Wheel)Rear Disc Brake Mounting and Hardware Inspection (With Dual Rear Wheel) Rear Disc Brake Mounting and Hardware Inspection (With Dual Rear Wheel).




3. Install the brake pad springs (1).




4. Install the outer brake pad (1).

5. Install the inner brake pad (2).

6. Prepare the brake caliper bracket bolts and the rear axle threaded holes for assembly.

* Clean the brake caliper bracket bolts of any threadlocking residue

* Clean the rear axle threaded holes of any threadlocking residue with denatured alcohol and allow to dry

7. Apply threadlocker GM P/N 89021297 (Canadian P/N 10953488) to 2/3 of the threaded length of the brake caliper bracket bolt.

8. Allow the threadlocker to cure approximately 10 minutes before assembly.




9. Position the brake caliper and bracket assembly (1) to the rear axle.





Caution: Refer to Fastener Caution Fastener Caution.

10. Install the brake caliper bracket bolts (1) and tighten to 300 Nm (221 lb ft).

11. Install the tire and wheel assembly. Refer to Tire and Wheel Removal and Installation Service and Repair.

12. With the engine OFF, gradually apply the brake pedal to approximately 2/3 of its travel distance.

13. Slowly release the brake pedal.

14. Wait 15 seconds, then repeat steps 14-15 until a firm pedal is obtained. This will properly seat the brake caliper pistons and brake pads.

15. Fill the brake master cylinder. Refer to Master Cylinder Reservoir Filling Master Cylinder Reservoir Filling.

16. Burnish the brake pads and rotors. Refer to Brake Pad and Rotor Burnishing Procedures.