Parking Brake System: Adjustments

Parking Brake Adjustment

Special Tools

CH-21177-A - Drum To Brake Shoe Clearance Gauge

For equivalent regional tools, refer to Special Tools Tools and Equipment.

1. Adjustments to the park brake shoe are not necessary after replacing the park brake lever or park brake cables. The park brake is adjusted automatically by cycling the park brake lever 3 times.

2. DO not operate the park brake lever with the rear disc brake rotor(s) removed.

3. Apply and fully release the parking brake 3 times.

4. Verify that the parking brake pedal releases completely.

5. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle Service and Repair.

6. Remove the rear tire and wheel assemblies. Refer to Tire and Wheel Removal and Installation (w RT2) Tire and Wheel Removal and Installation (w RT2)Tire and Wheel Removal and Installation (w/o RT2) Tire and Wheel Removal and Installation (w/o RT2).

7. Remove the rear brake rotors. Refer to Rear Brake Rotor Replacement (LFX) Rear Brake Rotor ReplacementRear Brake Rotor Replacement (L99, LS3, LSA) Rear Brake Rotor Replacement.




8. Set the CH-21177-A - Drum To Brake Shoe Clearance Gauge inside of the park brake drum at the widest point.

* Place the contacts of the tool at 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.




9. Position the CH-21177-A - Drum To Brake Shoe Clearance Gauge over the park brake shoe (1) at the widest point.

10. Turn the adjuster on the actuator until the park brake shoe just contacts the CH-21177-A - Drum To Brake Shoe Clearance Gauge.

11. Repeat steps 8 through 10 for the opposite side.

12. Install the rear brake rotors. Refer to Rear Brake Rotor Replacement (LFX) Rear Brake Rotor ReplacementRear Brake Rotor Replacement (L99, LS3, LSA) Rear Brake Rotor Replacement.

13. Install the rear tire and wheel. Refer to Tire and Wheel Removal and Installation (w RT2) Tire and Wheel Removal and Installation (w RT2)Tire and Wheel Removal and Installation (w/o RT2) Tire and Wheel Removal and Installation (w/o RT2).

14. Lower the vehicle to curb height.

15. Set and release the park brake lever 3 times.

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

16. Apply the parking brake. 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.