LEMON Manuals: Even more car manuals for everyone
Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1334 (Drum Brake System) >> Repair Instructions >> Drum Brake Adjustment >> Adjustment Procedure

Adjustment Procedure

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Rotating Brake Adjuster
    GM1357504Courtesy of GENERAL MOTORS CORP.
  1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
  2. Remove the rear tire and wheel. Refer to Tire and Wheel Removal and Installation .
  3. Disable the park brake cable automatic adjuster. Refer to Parking Brake Cable Adjuster Disabling .
  4. Remove the brake shoe adjuster access plug from the backing plate.
  5. Insert a thin bladed tool (2) through the adjuster access hole in the backing plate until it contacts the adjuster lever (4).
  6. Push the adjuster lever away from the adjuster screw (1).
  7. Using a suitable tool (3), rotate the adjuster screw upward.
  8. Remove the brake drum. Refer to Brake Drum Replacement .
    9. Fig 2: Cleaning Mating Surface Between Rear Axle Flange And Brake Drum
    GM1505822Courtesy of GENERAL MOTORS CORP.
  9. Using the J 42450-A  (1), clean the mating surface of the rear axle flange.
    10. Fig 3: Measuring Rear Brake Drum
    GM1241711Courtesy of GENERAL MOTORS CORP.
  10. Using the J 21177-A  (1), measure the inside diameter of the brake drum. See Special Tools .
    11. Fig 4: Checking Clearance Between Rear Brake Shoes & Rear Brake Drum
    GM1505825Courtesy of GENERAL MOTORS CORP.
  11. With the set screw (1) locked, place the opposite side of the J 21177-A  over the brake shoes. See Special Tools .
  12. Rotate the brake shoe adjuster screw until the brake shoes just contact the J 21177-A  . See Special Tools .
  13. Inspect the clearance between the brake shoes and the brake drum.

    Specification:  Approximately 0.76 mm (0.030 in)

  14. Install the brake drum. Refer to Brake Drum Replacement .
  15. Enable the park brake cable automatic adjuster. Refer to Parking Brake Cable Adjuster Enabling .
  16. If necessary, adjust the park brake cable tension. Refer to Parking Brake Adjustment (Drum Brake) or Parking Brake Adjustment (Disc Brake) .
  17. Install the tire and wheel. Refer to Tire and Wheel Removal and Installation .
  18. Lower the vehicle.
scientia non olet · About LEMON Manuals