Drum Brake Shoe Adjustment
NOTE:
Before proceeding. See Brakes - Warning or Brakes - Caution .
- Verify the parking brake lever is in the fully released position.
- Raise and support the vehicle. Refer to Vehicle Quick Reference/Hoisting - Standard ProcedureNOTE: Perform the following steps on each rear drum brake assembly as necessary.
- Remove the wheel mounting nuts (3), then the rear tire and wheel assembly.
- Remove any brake drum retaining clips (5), then the drum (6). See Brakes/Hydraulic/Mechanical/DRUM, Brake - Removal
1 - BRAKE SHOE GAUGE - Using a Brake Shoe Gauge (1), Special Tool C-3919 or equivalent, measure the inside diameter of the brake drum at the center of the shoe contact area. Tighten the Gauge set-screw at this measurement.
1 - BRAKE SHOE GAUGE - Place the other side of the brake shoe gauge (1) over the brake shoes as shown in Fig 4 .
- Adjust the shoe diameter to the setting on the gauge. To adjust the shoe diameter, turn the adjuster-screw star-wheel using a screwdriver inserted through the adjusting hole in the rear of the shoe support plate. Once the tip of the screwdriver contacts the star-wheel teeth, move the handle of tool downward using the support plate as a pivot to adjust the shoes outward.
- Once the shoe diameter is set, remove the tool and install the brake drum (6). See Brakes/Hydraulic/Mechanical/DRUM, Brake - Installation
- Turn the brake drum. A slight drag should be felt while rotating the drum. If not, repeat the above procedure.
- Install the tire and wheel assembly (1). Refer to Tires and Wheels - Installation . Install and tighten wheel mounting nuts (3) to 135 N.m (100 ft. lbs.).
- After adjusting both rear drum brakes as necessary, lower the vehicle.
- Apply and release the parking brake lever one time after the adjustment process is completed so the parking brake can readjust itself to the new brake shoe adjustment.
- Road test the vehicle stopping in both forward and reverse directions. The automatic-adjuster will continue to adjust the brakes as necessary during the road test.