GM Service Manual Online
For 1990-2009 cars only

Tools Required

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


    Object Number: 177200  Size: SH
  1. Set the J 21177-A so that the J 21177-A contacts the inside diameter of the rotor.

  2. Object Number: 177201  Size: SH
  3. Position the J 21177-A over the shoe and the lining at the widest point.
  4. Turn the adjuster nut until the lining just contacts the J 21177-A .
  5. Repeat steps 1 through 3 for the opposite side.
  6. The clearance between the park brake shoe and the rotor is .026 inches.