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Home >> GMC >> 2003 >> Jimmy 2D Utility, Part Time, Automatic >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Disc Brakes & Drum Brakes >> Adjustments & Inspection >> Drum Brake System >> Drum Brake Adjustment

Drum Brake Adjustment

  1. Raise and support the vehicle.
  2. Remove the brake drum. See BRAKE DRUM  under REMOVAL & INSTALLATION.
  3. Using the Drum Brake Shoe Clearance Gauge (J-21177-A), measure the inside diameter of the brake drum.
  4. Using the gauge, adjust the brakes shoes until there is approximately 0.020" (0.50 mm) clearance between the rear brake shoes and the rear brake drum.
  5. Using a punch and hammer, remove and discard the knockout plug in the backing plate which is directly behind the star wheel adjuster.
  6. Install the brake drum.
  7. Insert a flat bladed screw driver and move the adjuster lever away from the star wheel.
  8. Using a brake adjusting tool, rotate the brake adjuster until the amount of drag is equal on the left and right rear brake drums.
  9. Apply the brake pedal 2 times in order to center the brake shoes on the locating pins.
  10. Check the drums again for light drag. Adjust as necessary.
  11. Install an adjusting hole cover in the backing plate.
  12. Lower the vehicle.
  13. Check the park brake adjustment. See PARK BRAKE ADJUSTMENT  under ADJUSTMENTS & INSPECTION.
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