Parking Brake Actuator Replacement 15 Series

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

1. Release the park brake.
2. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
3. Remove the tire and wheel assembly. Refer to Tire and Wheel Removal and Installation in Tires and Wheels.
4. Relieve the tension from the park brake cables from the equalizer by pulling down on the intermediate cable and release the rear cables from the equalizer bar.
5. Remove the rear park brake cable from the park brake actuator lever.
6. For vehicles without RPO NYS, remove the park brake cable from the mounting bracket by depressing the locking tabs.
7. For vehicles with RPO NYS, remove the rear park brake bracket bolt.
8. Remove the rotor. Refer to Rear Brake Rotor Replacement in Disc Brakes.
9. Remove the axle shaft. Refer to Rear Axle Shaft Replacement in Rear Drive Axle.
10. Remove the park brake shoe. Refer to Parking Brake Shoe Replacement .



11. Remove the backing plate bolts.
12. Remove the park brake actuator lever housing from the backing plate.

1. Install the park brake actuator lever housing to the backing plate.
2. Perform the following procedure before installing the backing plate bolts.

2.1.	Remove all traces of the original adhesive patch.

2.2.	Clean the threads of the bolt with brake parts cleaner or the equivalent and allow to dry.

2.3.	Apply Threadlocker GM P/N 12345493 (Canadian P/N 10953488) to the threads of the bolt.

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.

3. Install the backing plate bolts.

Tighten
Tighten the backing plate bolts to 135 N·m (100 lb ft).

4. Install the park brake shoe. Refer to Parking Brake Shoe Replacement .
5. Install the axle shaft. Refer to Rear Axle Shaft Replacement in Rear Drive Axle.
6. Adjust the park brake shoe. Refer to Park Brake Adjustment .
7. Install the rotor. Refer to Rear Brake Rotor Replacement in Disc Brakes.
8. For vehicles without RPO NYS, install the park brake cable to the mounting bracket until the locking tabs snap into place.



9. For vehicles with RPO NYS, install the rear park brake bracket bolt.

Tighten
Tighten the bolt to 61 N·m(45 lb ft).

10. Install the rear park brake cable to the park brake actuator lever.
11. Install the rear cables to the equalizer by pulling down on the intermediate cable and install the rear cables to the equalizer bar.
12. Install the tire and wheel assembly. Refer to Tire and Wheel Removal and Installation in Tires and Wheels.
13. Remove the safety stands.
14. Lower vehicle.
15. Adjust park brake cable. Refer to Park Brake Adjustment .

Parking Brake Actuator Replacement 25/35 Series

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

1. Release the park brake.
2. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
3. Remove the tire and wheel assembly. Refer to Tire and Wheel Removal and Installation in Tires and Wheels.



4. Relieve the tension from the park brake cables by loosening the nut at the equalizer.
5. Remove the rear park brake cable from the park brake actuator lever.
6. Remove the rotor. Refer to Rear Brake Rotor Replacement in Disc Brakes.
7. Remove the park brake shoe. Refer to Parking Brake Shoe Replacement .
8. Remove the actuator lever from the backing plate.

1. Install the actuator lever to the backing plate.
2. Install the park brake shoe. Refer to Parking Brake Shoe Replacement .
3. Adjust the park brake shoe. Refer to Park Brake Adjustment .
4. Install the rotor. Refer to Rear Brake Rotor Replacement in Disc Brakes.



5. Install the rear park brake cable to the park brake actuator lever.

Notice: Refer to Fastener Notice in the Preface section.

6. Tighten the nut to the intermediate cable at the equalizer.

Tighten
Tighten the nut to 3.5 N·m (31 lb in).

7. Install the tire and wheel assembly. Refer to Tire and Wheel Removal and Installation in Tires and Wheels.
8. Remove the safety stands.
9. Lower vehicle.
10. Adjust park brake cable. Refer to Park Brake Adjustment .