See Figure 1
Inspect the brake shoes for wear using a ruler or Vernier caliper. Compare measurements to the brake specifications chart. If the lining is thinner than specification or there is evidence of the lining being contaminated by brake fluid or oil, repair the leak and replace all brake shoe assemblies (a complete axle set). In addition to the shoes inspect all springs and brake shoe hardware for wear and replace as necessary.
REMOVAL & INSTALLATION
See Figures 2, 3, 4 and 5
- Raise and safely support the vehicle.
- Remove the wheel and tire assembly.
- Remove the brake drum.
- Remove the parking brake cable from the parking brake lever.
- Remove the 2 brake shoe hold-down springs and pins.
- Lift the brake shoes, springs and adjuster assembly off the backing plate and wheel cylinder assembly. 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.
- Remove the horse shoe retaining clip and spring washer and slide the lever off the parking brake lever pin on the trailing shoe. Discard the horseshoe clip.
- Apply a light coating of disc brake caliper slide grease at the points where the brake shoes contact the backing plate.
- Apply a thin coat of lubricant to the adjuster screw threads and 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 screw into the adjusting pivot nut to the limit of the threads and then back off 1 / 2 turn.
- Assemble the parking brake lever to the trailing shoe by installing the spring washer and a new horse shoe retaining clip. Crimp the clip until it retains the lever to the shoe securely.
- Position the trailing shoe on the backing plate and attach the rear parking brake cable.
- Position the leading shoe on the backing plate and attach the lower brake shoe adjusting spring to the brake shoes.
- Install the adjuster assembly in the slots on the brake shoes. The wide slot on the dual slotted end must fit into the leading shoe. The narrow slot on the dual slotted end fits into the shoe adjusting lever. The single slotted side of the adjuster assembly must fit into the slots on the trailing shoe and the rear parking brake cable bracket.
The adjuster socket blade is marked R for the right or L for the left brake assemblies. The adjuster blade must be installed with the letter R or L in the upright position, facing the wheel cylinder. Make sure the adjuster socket fits into the parking brake lever.
- Complete the installation by reversing the removal procedures.
- Pump the brake pedal several times to position the brake shoes and finish the brake shoe adjustment.
- Road test the vehicle and check the brake system for proper operation.
See Figure 6
The rear brakes are automatically adjusted while driving the vehicle. The brakes are also adjusted each time the parking brake is applied. Manual brake adjustment is only required after the brake shoes or hardware has been replaced, or the adjuster has been replaced.
- Remove the brake drum as described in this section..
- Remove any excessive dust and dirt present on the brakes using the appropriate methods.
- Using a brake adjustment gauge, measure the inside diameter of the brake drum.
- Line up the brake shoes vertically so the flats on the bottom of the brake shoes are aligned approximately 0.05 inch (1.5mm) above the bottom of the abutment plate.
- Adjust the brake shoes to the same diameter as the drum by placing the brake adjustment gauge on the shoes and holding the adjusting lever out of engagement of the adjusting screw.
If the adjusting screw does not rotate freely, remove it, lubricate the threads, reinstall it and repeat the adjustment procedure.
- Install the brake drum as described in this section.