Brake Shoe: Service and Repair
BRAKE PADS/SHOES REAR DRUMREMOVAL
NOTE: Make sure parking brake is in "released" position before raising vehicle.
1. Raise vehicle.
2. Remove both rear tire and wheel assemblies from vehicle.
3. Remove brake drums from both sides of vehicle (Fig. 16).
NOTE: Perform Step 4 through Step 12 on each side of the vehicle to complete shoe set removal. It may be easier to install the new components on the first side of the vehicle before disassembling the opposite side, so it may be used as a reference guide for proper installation.
4. Remove hub and bearing dust cap (Fig. 16).
5. Remove hub and bearing retaining nut, then slide hub and bearing off spindle (Fig. 16).
6. Compress cable return spring, then remove parking brake cable from parking brake lever (Fig. 17).
7. Compress and remove shoe hold-down springs (Fig. 18).
8. Remove lower return spring (Fig. 18).
9. Remove both shoes and remaining parts as an assembly from support plate.
10. Remove adjuster spring from leading shoe and lever pawl (Fig. 19).
11. Remove lever pawl from pivot on leading shoe and slide out from under adjuster.
12. Remove adjuster and upper spring (Fig. 19).
CLEANING
WARNING: DUST AND DIRT ACCUMULATING ON BRAKE PARTS DURING NORMAL USE MAY CONTAIN ASBESTOS FIBERS FROM PRODUCTION OR AFTERMARKET BRAKE LININGS. BREATHING EXCESSIVE CONCENTRATIONS OF ASBESTOS FIBERS CAN CAUSE SERIOUS BODILY HARM. EXERCISE CARE WHEN SERVICING BRAKE PARTS. DO NOT SAND OR GRIND BRAKE LINING UNLESS EQUIPMENT USED IS DESIGNED TO CONTAIN THE DUST RESIDUE. DO NOT CLEAN BRAKE PARTS WITH COMPRESSED AIR OR BY DRY BRUSHING. CLEANING SHOULD BE DONE BY DAMPENING THE BRAKE COMPONENTS WITH A FINE MIST OF WATER, THEN WIPING THE BRAKE COMPONENTS CLEAN WITH A DAMPENED CLOTH. DISPOSE OF CLOTH AND ALL RESIDUE CONTAINING ASBESTOS FIBERS IN AN IMPERMEABLE CONTAINER WITH THE APPROPRIATE LABEL. FOLLOW PRACTICES PRESCRIBED BY THE OCCUPATIONAL SAFETY AND HEALTH ADMINISTRATION (OSHA) AND THE ENVIRONMENTAL PROTECTION AGENCY (EPA) FOR THE HANDLING, PROCESSING, AND DISPOSING OF DUST OR DEBRIS THAT MAY CONTAIN ASBESTOS FIBERS.
INSPECTION
Rear brake shoe lining should show contact across the entire width of the lining and also from the heel to the toe of the lining. Replace the shoes if noted otherwise.
Brake shoes with lack of contact at the toe or heel of the brake shoe lining may be improperly ground.
Clean and inspect the brake support plate and shoe adjuster screw. Apply a thin coat of Mopers Multi-Purpose Grease or equivalent to the threads of the self-adjuster. Replace the adjuster screw if it is corroded.
NOTE: Adjuster screws are different side-to-side. Left side adjuster screws have left-hand threads and right side adjuster screws have right-handed threads.
If the old brake shoe return or hold down springs have overheated or are damaged, replace them. Overheating indications are paint discoloration or distorted end coils.
INSTALLATION
NOTE: Perform Step 1 through Step 11 on each side of vehicle to complete shoe set installation, then proceed to Step 12.
1. Lubricate six shoe contact areas on support plate and anchor using Mopers Brake Lubricant or equivalent.
2. Before installing shoes on vehicle, perform the following on the bench:
a) Place one leading and one trailing shoe on bench (trailing shoe has parking brake lever attached to it).
b) Install adjuster and upper spring (Fig. 19).
c) Slide lever pawl under adjuster and onto pivot on leading shoe.
d) Install adjuster spring between leading shoe and lever pawl (Fig. 19).
3. Install pre-assembled brake shoe assembly on brake support plate (Fig. 18).
4. Install lower return spring (Fig. 18).
5. Install both shoe hold-down pins from rear, through support plate and shoes. Compress and install shoe hold-down springs on pins (Fig. 18).
6. Compress parking brake cable return spring, then install cable on parking brake lever (Fig. 20). Release spring guiding it beneath retaining tab on lever.
7. Insert cable into cable guide attached to anchor retaining plate.
8. Slide hub and bearing onto spindle (Fig. 16). Install retaining nut and tighten to 250 Nm (185 ft. lbs.) torque.
9. Install hub and bearing dust cap (Fig. 16).
10. Adjust brake shoes to drum diameter using brake shoe gauge.
11. Install brake drum (Fig. 16).
12. Install both tire and wheel assemblies. Tighten wheel mounting nuts to 135 Nm (100 ft. lbs.) torque.
13. Slowly rotate wheels and verify that brake drum lightly drags on shoes.
14. Lower vehicle.
15. Road test vehicle stopping in both forward and reverse directions. Automatic-adjuster will continue to adjust brakes as necessary during road test.