- DO not operate the park brake lever with the rear disc brake rotor(s) removed.
- Apply and fully release the parking brake three times.
- Verify that the parking brake pedal releases completely.
- Raise and suitably support the vehicle.
- Remove the rear tire and wheel assembly.
- Remove the rear brake caliper brackets.
- Remove the rear brake rotors.
- Set the Drum To Brake Shoe Clearance Gage J-21177-A inside of the park brake drum at the widest point.
- Place the contacts on the tool to the widest point of the drum.
- Tighten the set screw on the tool to ensure the proper measurement when removing the tool from the drum.
- Position the tool over the park brake shoe at the widest point.
- Turn the adjuster on the actuator until the park brake shoe just contacts the tool.
- Repeat for the opposite side.
- Install the rear brake rotors.
- Install the rear caliper brackets.
- Install the rear tire and wheel.
- Lower the vehicle to curb height.
Set and release the park brake lever three times.
NOTEIf the rear wheels rotate during the following test, readjust the parking brake shoes.
- Apply the parking brake. Inspect the rotation of the rear wheels: The wheels should not rotate forward nor drag or rotate backward.
- Release the parking brake. Verify that the wheels rotate freely.
- Lower the vehicle.
- Remove the caliper, caliper bracket and rear disc brake rotor using the procedures found in this section. Slowly turn the rotor while pulling away from the hub.
- Loosen the parking brake cable adjusting nut until the lever is at its "rest" position.
Using a Drum To Brake Shoe Clearance Gauge such as GM's J 41713, or equivalent:
- Set the tool so that it contacts the inside diameter of the rotor.
- Position the Clearance Gauge over the parking brake shoes at its widest point.
- Turn the adjuster nut until the brake shoe lining just touches the Clearance Gauge.
- Repeat the procedure for the opposite side.
- Tighten the parking brake cable adjusting nut.
- Slowly turn the rotor while installing onto the bearing assembly.
- Assemble the remaining components using the procedures found in this section.
Removal & Installation
- Remove the wheel bearing and hub assembly.
- Rotate the parking brake adjusting nut until all park brake shoe adjustment has been removed.
- Remove the parking brake shoe retaining spring.
- Remove the park brake shoe assembly by grasping the shoe and spreading slightly while pulling the shoe from the actuator assembly.
- Install the park brake shoe assembly by grasping the shoe and spreading slightly while pulling the shoe over the actuator assembly.
- Install the parking brake shoe retaining spring.
- Install the wheel bearing and hub assembly.
- Adjust the parking brake shoe-to-drum clearance.
- Lower the vehicle.
On vehicles equipped with rear disc brake calipers without built-in parking brake adjusters, the parking brake assembly is contained inside the rear disc brake rotor. Two small brake shoes press against the inside diameter of the rear brake rotor.
- Raise and safely support the vehicle with safety stands.
- Remove the rear caliper using the procedure found in this section. It is not necessary to disconnect the brake line. Use wire to hang the caliper out of the way. Do not allow the caliper to hang by the brake hose.
- Remove the caliper bracket bolts and remove the caliper. It may take considerable force to remove the bolts. They were factory installed with a thread-locking compound.
- Remove the rear rotor using the procedures found in this section.
- Disconnect the parking brake actuator.
- Remove the rear wheel hub using the procedures found in Section 8.
- Remove the shoes from the parking brake support plate.
- Installation is the reverse of the removal process. Note that when the caliper bracket is installed, use thread-locking compound on the bolts. Torque the caliper bracket bolts to 92 ft. lbs. (125 Nm).The parking brake brakes should be adjusted before the rotor is installed. Use the procedure in this section.