REMOVAL & INSTALLATION
- Remove the hub cap (if used) and loosen the lug nuts. Release the parking brake.
- Block the front wheels, raise the rear of the truck, and support it with jackstands.
- Remove the rear wheels.
- Unfasten the brake drum retaining screws, if used. Not all models have them.
- Tap the drum lightly with a mallet in order to free it.
If the drum cannot be removed easily, try one or both of the following steps:
- Thread two 8 x 1.25mm bolts into the threaded holes two turns at a time to lift the drum off the hub.
- Insert a screwdriver into the hole in the backing plate and hold the automatic adjusting lever away from the adjusting bolt. Using another flat-bladed tool, relieve the brake shoe tension by turning the adjusting bolt clockwise. If the drum still will not come off, use a puller, but first make sure that the parking brake is fully released.
- Inspect the brake drum for any wear or deterioration. Check the inside diameter of the drum with the Brake Specifications chart. Replace if necessary.
- To install the drum, simply place the drum on the axle and tighten the retaining screw, if used. Adjust the brakes.
- Install the wheels and lower the truck. Road test the vehicle checking for correct function.
- Clean the drum.
- Inspect the drum for scoring, cracks, grooves and out-of-roundness. Replace the drum or have it "turned" at a machine or brake specialist shop, as required. Light scoring may be removed by dressing the drum with fine emery cloth.
- Measure the inside diameter of the drum. A tool called a H-gauge caliper is used. See the Brake Specifications chart for your vehicle.