Parking Brake Actuator: Service and Repair

Park Brake Actuator Replacement (1500 Series w/Rear Disc)

Caution: Refer to Brake Dust Caution in Service Precautions.

Removal Procedure





1. Release the park brake.
2. Raise and support the vehicle.
3. Remove the tire and wheel assembly.
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.
9. Remove the axle shaft.
10. Remove the park brake shoe.





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

Installation Procedure





1. Install the park brake actuator lever housing to the backing plate.
2. Perform the following procedure before installing the backing plate bolts.
1. Remove all traces of the original adhesive patch.
2. Clean the threads of the bolt with brake parts cleaner or the equivalent and allow to dry.
3. Apply Threadlocker GM P/N 12345493 (Canadian P/N 10953488) to the threads of the bolt.

3. Install the backing plate bolts. Tighten the bolts to the following:
^ 15 Series, 25 Series w/6.0L, tighten the bolts to 135 Nm (100 ft. lbs.).
^ 25 Series w/8.1L or 6.6L, 35 Series, tighten the bolts a first pass to 160 Nm (118 ft. lbs.).
^ 25 Series w/8.1L or 6.6L, 35 Series, tighten the bolts a final pass an additional 30 degrees.

Notice: Refer to Fastener Notice in Service Precautions.


4. Install the park brake shoe.
5. Install the axle shaft.
6. Adjust the park brake shoe.
7. Install the rotor.
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 the bolt to 61 Nm (45 ft. lbs.).
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.
13. Remove the safety stands.
14. Lower vehicle.
15. Adjust park brake cable.