Drum Brake System: Service and Repair
Removal1. Raise and support the vehicle after releasing the parking brake.
2. Remove the wheel and tire.
3. Remove the hub cap.
4. Use a small cape chisel to raise the staked edge of the lock nut.
Notice Use carefully not to damage the groove and threads of spindle.
5. Remove the drum, washer and bearings as an assembly from the spindle.
6. Remove the brake shoe hold-down springs and pins.
7. Remove the brake shoe assembly.
8. Remove the parking brake cable from the brake shoe assembly.
9. Remove the wheel cylinder brake pipe.
10. Remove the wheel cylinder attaching bolt.
11. Remove the anti-rattle spring from brake shoe assembly.
12. Remove the operating lever after removing the return spring.
13. Remove the parking brake operating lever retainer.
Inspection
Brake drum
1. Inspect the inside of the brake drum for scratches and uneven or abnormal wear.
2. Repair minor damage or replace if damage is excessive.
3. Measure the inside diameter of the brake drum using Brake Drum Micrometer or equivalent.
4. The standard inner drum diameter is 7.87 inches (200 mm).
The maximum diameter is 7.91 in (201 mm).
Caution Be sure to check the drum-to-shoe contact after repairing or replacing the brake drum.
5. Check the brake linings for peeling, cracks, or extremely uneven wear.
6. If the brake lining thickness is less than 0.04 inch (1.0 mm), replace the brake shoes.
Installation
1. Clean the backing plate with an approved vacuum cleaner.
2. Lubricate the backing plate shoe pads.
3. Install the wheel cylinder to the backing plate.
4. Install the wheel cylinder brake pipe.
5. Install the parking brake operating lever after installing the rake shoe assembly.
6. Put the parking brake cable into the operating lever.
7. Position the brake shoe assembly to the wheel cylinder.
8. Install the brake shoe hold-down pin and spring clip
9. Install the drum, washer and bearing to the spindle.
10. Firmly fix the lock nut to the groove.
11. Install the hub cap.