Parking Brake Adjustment

Special Tools 

CH-230-A  Gauge

For equivalent regional tools, refer to Special Tools .

1. Adjustments to the parking brake shoes are not necessary after replacing the electronic parking brake control module or parking brake cable.
2. Disable the parking brake cable adjuster. Refer to Parking Brake Cable Adjuster Disabling .
3. Verify that the parking brake releases completely.
4. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
5. Remove the rear tire and wheel assemblies. Refer to Tire and Wheel Removal and Installation .
Fig 1: Disc Brake Rotor
Courtesy of GENERAL MOTORS COMPANY
NOTE:

Do not operate the electronic parking brake with the rear disc brake rotor(s) removed.

6. Remove the rear brake rotors (1). Refer to Rear Brake Rotor Replacement .
7. Set the outside diameter measurement of the CH-230-A  gauge to 189.6 mm (7.46 in).
8. Tighten the set screw.
Fig 2: View Of Park Brake Shoe Assembly & Actuator Assembly
Courtesy of GENERAL MOTORS COMPANY
9. Position the CH-230-A  gauge over the parking brake shoe (1) at the widest point.
10. Rotate the parking brake shoe adjuster (2) until the parking brake shoe diameter measures 189.6-189.8 mm (7.46-7.47 in).
11. Repeat steps 9 through 10 for the opposite side.
Fig 3: Disc Brake Rotor
Courtesy of GENERAL MOTORS COMPANY
12. Install the rear brake rotors (1). Refer to Rear Brake Rotor Replacement .
13. Install the rear tire and wheel assemblies. Refer to Tire and Wheel Removal and Installation .
14. Lower the vehicle to curb height.
15. Enable the parking brake cable adjuster. Refer to Parking Brake Cable Adjuster Enabling .
NOTE:

If the rear wheels rotate during the following test, readjust the parking brake shoes.

16. Apply the parking brake and inspect the rotation of the rear wheels:
    • The wheels should not rotate forward.
    • The wheels should not rotate rearward.
17. Release the parking brake. Verify that the wheels rotate freely.
18. Lower the vehicle.