Inspect the brake shoes for excessive lining wear or shoe damage. If the lining is worn below 1 / 32 in. (0.8mm) replace both shoes. Replace any lining that has become contaminated with brake fluid, oil or grease.
Replace the brake shoe and lining in axle sets only. Never replace just one shoe of a brake assembly.
Check the condition of the brake shoes and linings, retracting springs, hold-down springs and the brake drum for signs of overheating. If the shoes and linings have a slight blue coloring (indicating overheating), the retracting springs and hold-down springs should be replaced. If they're not replaced, the overheated springs will lose their tension and could allow new linings to drag and prematurely wear.
REMOVAL & INSTALLATION
See Figures 1, 2, 3, 4, 5 and 6
Special brake tools are available from auto supply stores, which will ease removal and installation of the retracting springs and the shoe hold-down spring/anchor pin assembly.
- Raise and safely support the vehicle.
- Remove the wheel and tire assembly, then remove the brake drum.
- For 1993-95 vehicles, remove the parking brake cable and conduit from the parking brake lever. For vehicles though 1992, it may be easier to remove the parking brake cable after lifting the assembly off the backing plate.
- Using a suitable tool, depress and twist the two hold-down spring retainers one-quarter turn, then remove the retainers and hold-down springs. The hold-down pins can be removed from the rear of the backing plate.
- Lift the brake shoes and linings, retracting springs, and adjuster assembly off the backing plate. When removing the assembly, be careful not to bend the adjusting lever.
- Remove the retracting springs from the lower brake attachments and upper shoe-to-adjusting lever attachment points. This will separate the brake shoes and disengage the adjuster mechanism.
- Remove the horseshoe parking brake lever pin retainer and spring washer, then slide the lever off the parking brake lever pin on the trailing shoe.
- Apply a light coating of Disc Brake Caliper Slide Grease D7AZ-19590-A or equivalent, at the points where the brake shoes contact the backing plate.
- Apply a thin coat of lubricant to the adjuster screw threads and the socket end of the adjusting screw. Install the stainless steel washer over the socket end of the adjusting screw and install the socket. Turn the adjusting nut all the way down on the screw, then back off 1 / 2 turn.
- Assemble the parking brake lever to the trailing shoe by installing the spring washer and a new horseshoe parking brake lever pin retainer. Crimp the clip until it retains the lever to the shoe securely.
- Position the trailing shoe against the brake backing plate, then attach the parking brake cable.
- For vehicles through 1992, attach the lower shoe retracting spring to the leading and trailing shoe, then install to the backing plate. It will be necessary to stretch the retracting spring as the shoes are installed downward over the anchor plate to the inside of the shoe retaining plate.
- For 1993-95 vehicles, position the leading shoe on the rear brake backing plate, then attach the lower brake shoe retracting spring to the brake shoes.
- Install the adjuster screw assembly between the leading shoe slot and the slot in the trailing shoe/parking brake lever assembly. The adjuster socket end slot must fit into the trailing shoe and parking brake lever.
- Install the adjuster lever in the groove of the parking brake lever pin and into the slot of the adjuster socket that fits into the trailing shoe web.
The adjuster socket blade is marked R for the right-hand or L for the left-hand brake assemblies. The R or L adjuster blade must be installed with the letter R or L in the upright position, facing the wheel cylinder, on the correct side to ensure that the deeper of the 2 slots in the adjuster socket fits into the parking brake lever.
- Attach the upper retracting spring to the leading shoe slot. Using a suitable spring tool, stretch the other end of the spring into the notch on the adjuster lever. If the adjuster lever does not contact the star wheel after installing the spring, it is possible that the adjuster socket is installed incorrectly.
- Install the brake shoe hold-down spring pins, brake shoe hold-down springs and retainers. If installed, remove the brake cylinder clamp D81L-1103-B or equivalent. Attach the parking brake cable and conduit to the parking brake lever.
- Adjust the brake shoes, as outlined earlier in this section.
- Install the brake drum, then the wheel/tire assembly. Lower the vehicle.