GM Service Manual Online
For 1990-2009 cars only

Tools Required

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


    Object Number: 177200  Size: SH
  1. Adjust the J 21177-A until it contacts the inside diameter of the rotor (1).

  2. Object Number: 177201  Size: SH
  3. Position the J 21177-A over the park shoe lining, left side shown, at the widest point (1).
  4. Turn the adjuster nut until the lining just contacts the J 21177-A .
  5. Repeat steps 1 through 3 to adjust the right rear park brake.
  6. 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.