REMOVAL & INSTALLATION
See Figures 1 through 25
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.
Support the truck securely.
Remove the wheels.
Unfasten the brake drum retaining screws.
Tap the drum lightly with a mallet in order to free it. If the drum cannot be removed easily, insert a screwdriver into the hole in the backing plate and hold the automatic adjusting lever away from the adjusting bolt. Using another screwdriver, 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 released. On models with dual rear wheels, the drum is removed along with the rear axle shaft.
Do not depress the brake pedal once the brake drum has been removed.
Inspect the brake drum as detailed in the following section.
To install the drum, simply replace the drum on the axle and tighten the retaining screw.
Don't forget to adjust the brake shoes.
Do not step on the brake pedal with the drum removed.
Install the wheels and lower the truck. Bleed the brakes and road test the vehicle.
Fig. Fig. 1: View of the rear brake drum --installed
Fig. Fig. 2: View of the rear brake drum with retaining screws
Fig. Fig. 3: Removing rear brake drum retaining screws
Fig. Fig. 4: Removing the rear brake drum
Fig. Fig. 5: Cleaning the rear brake shoes and related parts
Fig. Fig. 6: View of the rear brake shoes and related parts
Fig. Fig. 7: Removing the brake return spring
Fig. Fig. 8: Removing the brake hold-down spring--with special brake tool
Fig. Fig. 9: Removing the brake hold-down spring
Fig. Fig. 10: Removing the brake hold-down spring and washers
Fig. Fig. 11: Removing the back brake shoe (secondary)
Fig. Fig. 12: Removing the front brake shoe (primary)
Fig. Fig. 13: View of the parking brake cable to brake shoe
Fig. Fig. 14: Removing the E-clip from the brake shoe
Fig. Fig. 15: View of the E-clip on related brake parts
Fig. Fig. 16: Removing the spring on brake related parts
Fig. Fig. 17: View of the self-adjuster assembly
Fig. Fig. 18: Removing the self-adjuster assembly
Fig. Fig. 19: View of the brake springs in the installed position
Fig. Fig. 20: Removing the wheel cylinder assembly
Fig. Fig. 21: Removing the wheel cylinder assembly piston
Fig. Fig. 22: View of the wheel cylinder assembly
Fig. Fig. 23: Removing the rubber inspection plug from the backing plate
Fig. Fig. 24: Adjusting the brake shoes after installation
Fig. Fig. 25: Bleeding the brake shoes after installation
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.
Heavy scoring will require the use of a brake drum lathe to turn the drum.