Park Brake Adjustment (Disc)
Park Brake Adjustment (Disc)^ Tools Required
- J 21177-A Drum-to-Brake Shoe Clearance Gage
1. Apply and fully release the parking brake six times.
2. Verify that the parking brake pedal releases completely.
^ Turn ON the ignition. Verify that the BRAKE indicator lamp is off.
^ If the BRAKE indicator lamp is on, ensure that the parking brake pedal is in release mode and fully returned to stop. Remove the slack in the front parking brake cable by pulling downward on the cable.
3. Raise and suitably support the vehicle. Refer to Vehicle Lifting.
4. Remove the rear wheels and tires.
5. Relieve tension on the park brake system at the park brake equalizer.
6. Remove both rear caliper bracket bolts.
Notice: Support the brake caliper with heavy mechanic's wire, or equivalent, whenever it is separated from it's 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.
7. Remove brake caliper and bracket as one assembly. Do not disconnect the brake hose from the caliper. support the assembly with mechanic's wire, or equivalent.
8. Remove rear brake rotor.
9. Set the J 21177-A inside of the park brake drum (1) at the widest point.
^ Place the contacts on the tool to the widest point of the drum (1).
^ Tighten the set screw on the tool to ensure the proper measurement when removing the tool from the drum (1).
10. Position the J21177-A over the park brake shoe (1) at the widest point.
11. Turn the adjuster on the actuator until the park brake shoe (1) just contacts the J 21177-A.
12. Repeat steps eight through eleven for the opposite side.
13. Install both rear brake rotors.
14. Install both rear brake calipers and brackets.
Important: To ensure that the proper clamp load will be present when installed. It is imperative that the threads on the caliper bracket bolts, as well as the mounting holes in the knuckle, be cleaned of all debris and inspected before proceeding with installation.
15. Clean and visually inspect threads of the caliper bracket bolts (2) and mounting holes in the knuckle.
16. Apply Threadlocker, GM P/N 12345493 (Canadian P/N 10953488), or equivalent to the threads of the brake caliper bracket bolts (2).
Notice: Refer to Fastener Notice in Service Precautions.
17. Install the caliper bracket bolts.
^ Tighten the brake caliper bracket bolts to 130 Nm (96 ft. lbs.).
18. Install the rear wheels and tires.
19. Adjust the parking brake cable by turning the nut at the equalizer (2) while spinning both rear wheels. When either rear wheel starts to drag, back off the nut one full turn.
20. Lower the vehicle to curb height.
21. Apply the parking brake, then inspect for rotation of the rear wheels. If the rear wheels rotate during this inspection, readjust the parking brake cable.
22. Release the parking brake. Verify that the wheels rotate freely.
23. Lower the vehicle.