GM Service Manual Online
For 1990-2009 cars only

Tools Required

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

  1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  2. Remove the rear wheels and tires. Refer to Tire and Wheel Removal and Installation in Tires and Wheels.

  3. Object Number: 239094  Size: SH
  4. Remove the rear drums. Refer to Brake Drum Replacement .
  5. Set the J 21177-A so that the J 21177-A contacts the inside diameter of the drum at the widest point.

  6. Object Number: 239090  Size: SH
  7. Position the J 21177-A over the shoes at the widest point.
  8. Turn the adjuster nut until the shoes just contact the J 21177-A .
  9. Repeat steps 2 through 5 for the other rear brake assembly.
  10. Install the rear drums. Refer to Brake Drum Replacement .
  11. Install the rear wheels and tires. Refer to Tire and Wheel Removal and Installation in Tires and Wheels.
  12. Lower the vehicle.