See Figures 1 and 2
- Raise and safely support the vehicle.
- Remove the tire and wheel assemblies.
- Remove the brake drums.
- Set drum-to-brake shoe clearance gauge J 21177-A, or equivalent, so that is contacts the inside diameter of the brake drum.
- Position the gauge over the brake shoes.
- Turn the brake adjuster until the brake shoes contact the clearance gauge. The outside diameter of the primary shoe and the secondary shoe will be about 0.050 in. (0.127mm) less than the inside diameter of the drum on each wheel.
- After the adjustment is complete, install the brake drum.
- Install the tire and wheel assemblies.
- Carefully lower the vehicle, then test drive the vehicle, making several stops applying a firm force to the brake pedal. Repeat this until good pedal reserve is built up.
REMOVAL & INSTALLATION
See Figures 3 and 4
- Raise and safely support the vehicle.
- Remove the wheel and tire assemblies.
- Remove the brake drum.
- Remove the return springs using tool J8059 or equivalent.
- Use a suitable pair of pliers to remove the hold-down springs and pins.
- Remove the actuator pivot.
- While lifting up on the actuator, remove the actuator link.
- Remove the actuator and actuator return spring.
- Remove the shoe guide, parking brake strut and strut spring.
- Remove the brake shoes from the brake backing plate and parking brake rear cable.
- Remove the adjusting screw assembly and spring.
- Detach the parking brake cable from the parking brake lever by pushing the lever into the parking brake cable return spring. Disengage the cable end from the lever.
- Remove the primary shoe with the parking brake lever and parking brake cable return spring.
Remove the parking brake lever as follows:
- Pry the retaining ring open, then remove and discard it.
- Push out the pivot pin.
Any part or spring which may appear worn should be replace. The short shoe (primary) should be installed to the front of the vehicle and the long shoe (secondary) should be installed to the rear. After complete installation of the brake shoes a clicking sound should be heard when turning the adjusting screw or self-adjuster. Do not switch parts from the left or right brake assembly, the adjusters are designated Left and Right.
- Clean dirt from all parts and wire brush raised pads on backing plate. Lubricate backing plate pads and adjusting screw with brake grease.
Install the parking brake lever on the secondary shoe as follows:
- Insert the pivot pin through the holes in the primary shoe and parking brake lever.
- Install and crimp a new retaining ring.
- Lubricate the adjusting screw with brake (white) grease. Install the adjusting screw and spring.
- Clean and lubricate the contact points of the backing plate.
Install the brake shoe assemblies after installing the parking brake cable on the shoe, as follows:
- Start the shoe spring tang into the piston near the inside diameter of the shoe.
- Pull up on the shoe, compress the shoe spring tang, and rotate the shoe towards the piston face until the opposite shoe spring tang snaps into the piston. The shoes should lay flat against the piston.
- After installing the shoes, check that the boot is not touching the shoes. If it is, remove the shoes and reposition the boot.
Install the parking brake strut and strut spring by spreading the shoes apart. For proper positioning, make sure the following conditions exist:
- The strut end without the strut spring engages the parking brake lever and primary or secondary shoe.
- The strut end with the strut spring engages the opposite primary or secondary shoe.
- Install the shoe guide, actuator lever and lever return spring.
- Install the hold-down pins, actuator lever pivot and hold-down springs.
- Install the actuator link on the anchor pin.
- Install the actuator link into the actuator lever while holding up on the lever.
- Install the shoe return springs using tool J 8057 or equivalent.
- Install the brake drum and the wheel and tire assemblies.
- Adjust the brake, then carefully lower the vehicle. Check emergency brake for proper adjustment.