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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1366 (Drum Brake System) >> Repair Instructions >> Drum Brake Adjustment >> Tools Required

Tools Required

WARNING: This page is about a different car, the 2004 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.

J 21177-A  Drum-to-Brake Shoe Clearance Gauge. See Special Tools and Equipment .

    Fig 1: Turning Park Brake Lever Strut Using Screwdriver
    GM239084Courtesy of GENERAL MOTORS CORP.
  1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  2. Remove the tire and wheel assembly from the vehicle. Refer to Tire and Wheel Removal and Installation in Tires and Wheels.
  3. Insert a screwdriver through the hole in the backing plate. Hold the automatic adjusting lever away from the adjusting bolt.
  4. Reduce the brake shoe adjustment by turning the adjusting bolt. Use another screwdriver.
  5. Remove the drum.
  6. Insert J 21177-A  . See Special Tools and Equipment . Ensure that the gauge contacts the inner diameter of the brake drum.
  7. Position J 21177-A  over the shoes and linings. See Special Tools and Equipment .
  8. Turn the adjuster until the primary and secondary shoes and linings contact J 21177-A  . See Special Tools and Equipment .

    The outside diameter of the shoes and linings should be approximately 0.6 mm (0.024 in) less than the diameter of the brake drum.

  9. Install the drum. Refer to Brake Drum Replacement .
  10. Install the tire and wheel assembly to the vehicle. Refer to Tire and Wheel Removal and Installation in Tires and Wheels.
  11. Lower the vehicle.