Removal & Installation
Dust and dirt accumulating on brake parts during normal use may contain asbestos fibers from production or aftermarket brake linings. Breathing excessive concentrations of asbestos fibers can cause serious bodily harm. Exercise care when servicing brake parts. Do not sand or grind brake lining unless equipment used is designed to contain the dust residue. Do not clean brake parts with compressed air or by dry brushing. Cleaning should be done by dampening the brake components with a fine mist of water, then wiping the brake components clean with a dampened cloth. Dispose of cloth and all residue containing asbestos fibers in an impermeable container with the appropriate label. Follow practices prescribed by the Occupational Safety and Health Administration (OSHA) and the Environmental Protection Agency (EPA) for the handling, processing, and disposing of dust or debris that may contain asbestos fibers.
- Before servicing the vehicle, refer to the Precautions Section.
- Raise and safely support the vehicle.
- Remove the wheel mounting nuts, then the tire and wheel assembly.
Slide the brake drum (4) off the wheel mounting studs of the hub and bearing (5) and remove it from the vehicle.
If the drum does not come off, further brake clearance can be obtained by backing off the brake adjuster screw. To do so, perform the following procedure:
- Remove the plug from the rear of the support plate below the wheel cylinder.
- Insert a small screwdriver through the access hole (2) in the support plate, under the adjuster, against the lever pawl. The pawl is attached to and pivots from the rear brake shoe.
- While pushing on the pawl with the screwdriver to disengage it from the adjuster wheel teeth, rotate the wheel (1) upward to back off the adjustment using another screwdriver or a brake adjuster tool.
Once the adjuster screw is backed off a sufficient amount, slide the drum off the wheel mounting studs.
Before installing the drum, inspect the brake shoe linings for wear, alignment, and contamination. Repair or replace, as necessary.
If rust or any foreign material is present on the hub, drum, or wheel mating surfaces, wet wire brush these areas to remove debris prior to the assembly of the brake parts.
- Properly remove any buildup formed along the outer edge of the brake drum machined braking surface.
- Adjust the brake shoes-to-drum diameter using a brake shoe gauge.
- Slide the brake drum (4) onto the wheel mounting studs on the hub and bearing (5).
- Install the tire and wheel assembly. Install and tighten the wheel mounting nuts to 100 ft. lbs. (135 Nm).
- Lower the vehicle.
- 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.