Park Brake Adjustment

Tools Required 

J 21177-A  Drum-to-Brake Shoe Clearance Gage

Fig 1: Measuring Inside Of Rotor
Courtesy of GENERAL MOTORS CORP.
1. Adjust the J 21177-A  until it contacts the inside diameter of the rotor (1).
Fig 2: Adjusting Parking Brake Shoes Using Special Tool
Courtesy of GENERAL MOTORS CORP.
2. Position the J 21177-A  over the park shoe lining, left side shown, at the widest point (1).
3. Turn the adjuster nut until the lining just contacts the J 21177-A  .
4. Repeat steps 1 through 3 to adjust the right rear park brake.
5. The clearance between the rear park brake shoe lining and the rotor should be 0.25 mm (0.010 in) or 0.50 mm (.020 in) total.