Drum Brake System: Service and Repair
Removal1. Remove rear wheel and tire assembly from vehicle.
2. Remove rear brake drums from hub and bearing assemblies after loosening the two brake drum screws.
3. Be sure that the parking brake pedal is in the release (most upward position.
4. Completely loosen square nut of the rear parking brake cable. Then create slack in the rear parking brake cables.
5. Remove adjuster spring from adjust lever and brake shoe.
6. Remove adjust lever and turn the adjusting wheel of adjuster assembly to the direction of the arrow as shown.
7. Remove the strut spring and the lower retracting spring from the brake shoe.
8. Remove the upper return spring from the brake shoe.
9. Remove brake back plate hold down spring and pin from the leading brake shoe assembly.
10. Remove the leading brake shoe. Then remove the adjuster assembly, strut and anchor spring from the trailing brake shoe.
11. Remove the trailing brake shoe from the brake back plate after removing hold down spring and pin.
12. Remove the trailing brake shoe from the rear parking cable.
13. Remove parking pivot lever from the leading brake shoe.
Inspection
1. Inspect the disassembled parts for wear, rust or damage.
2. Measure the thickness of brake shoe lining.
Standard: 0.17 inch (4.5 mm)
Minimum: 0.04 inch (1 mm)
3. If the shoe lining is less than minimum or shows signs of uneven wear, replace new one.
4. Measure the inside diameter of the brake drum.
Standard: 10 inch (254 mm)
Maximum: 10.05 inch (255.2 mm)
5. If the inside diameter of the brake drum is more than maximum or shows signs of uneven wear, replace new one.
6. Inspect the lining and drum for proper contact. If the contact condition is improper, repair it with a grinder or replace the brake shoe assembly.
Replacement
1. Lubricate the eight shoe contact areas on the back plate and anchor.
2. Install the trailing brake shoe to the rear parking cable.
3. Install trailing brake shoe on brake back plate and install the trailing brake shoe hold down spring and pin on the brake shoe.
4. Tighten the square nut of rear parking cable.
5. Install the anchor spring then install adjuster assembly, and strut.
6. Install leading brake shoe on brake back plate.
7. Install the brake shoe upper return spring, strut spring and the lower retracting spring to the brake shoe.
8. Properly rotate the adjusting wheel of adjuster assembly to the direction of the arrow in as shown.
9. Install the adjuster spring on the adjust lever and leading brake shoe assembly.
10. Install the leading brake shoe hold down spring and pin on the brake shoe.
11. Adjust brake shoes assemblies so as not to interfere with brake drum installation.
12. Install the rear brake drums on the hubs.
13. Check and adjust whether the pedal stroke in the specification.
14. Install wheel and tire.
15. Push the parking brake pedal to the floor once and release pedal. This will automatically remove the slack from and correctly adjust the parking brake cables.
16. Test the vehicle on the road. The adjust will continue the brake adjustment during the road test of vehicle.