GM Service Manual Online
For 1990-2009 cars only

Tools Required

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


    Object Number: 177186  Size: SH
  1. Remove the brake caliper bracket. Refer to Rear Brake Caliper Bracket Replacement in Disc Brakes.
  2. Remove the rotor.
  3. Turn the rotor slowly while pulling the rotor away from the hub.

  4. Loosen the adjusting nut on the parking brake cable until the lever is at the rest position.

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

  7. Object Number: 177201  Size: SH
  8. Position the J 21177-A over the shoe and lining at the widest point.
  9. Turn the adjuster nut until the shoe and lining (1) just contacts the J 21177-A .
  10. Repeat steps two through five for the rotor on the opposite side.
  11. Adjust the adjusting nut on the rear parking brake cable. Refer to Park Brake Cable Service/Adjustment .

    Object Number: 177186  Size: SH
  1. Tighten the parking brake cable adjusting nut. Refer to Park Brake Cable Service/Adjustment .
  2. Install the rotor.
  3. Turn the rotor slowly while sliding the rotor onto the bearing assembly.

  4. Install the brake caliper bracket. Refer to Rear Brake Caliper Bracket Replacement in Disc Brakes.