Drum Brake System: Service and Repair

REMOVAL





1. INSPECT SHOE LINING THICKNESS
Remove the adjustment hole plug, and check the shoe lining thickness through the hole.
If less than minimum, replace the shoes.
Minimum thickness: 1.0 mm (0.039 inch)
2. REMOVE REAR WHEEL
3. RELEASE PARKING BRAKE LEVER





4. REMOVE BRAKE DRUM

HINT: If the brake drum cannot be removed easily, do the following steps.

a. Remove the adjustment hole plug and insert a screwdriver through the hole in the backing plate.
b. Place the end of a screw driver against the surface of the adjusting latch, and move it in the direction "A".
5. REMOVE FRONT SHOE
Remove the front shoe.





1. Using SST, remove the 2 return springs and anchor spring.
SST 09703-30010





2. Using SST, remove the cup, shoe hold-down spring and pin.
SST 09718-00010
3. Remove the front shoe and strut.
4. Remove the 2 C-washers.
5. Remove the automatic adjusting lever, automatic adjusting lever spring and automatic adjusting latch.





6. REMOVE REAR SHOE
a. Using SST, remove the cup, shoe hold-down spring and pin.
SST 09718-00010
b. Using needle-nose pliers, disconnect the parking brake cable from the parking brake lever, and remove the rear shoe.
7. REMOVE PARKING BRAKE LEVER
a. Remove the C-washer.
b. Remove the parking lever from rear shoe.





8. REMOVE WHEEL CYLINDER
a. Using SST, disconnect the brake line. Use a container to catch the brake fluid.
SST 09751-36011
Torque: 15 Nm (155 kgf-cm, 11 ft. lbs.)
b. Remove the bolt and the wheel cylinder.
Torque: 10 Nm (100 kgf-cm, 7 ft. lbs.)





9. DISASSEMBLE WHEEL CYLINDER
a. Remove the 2 boots from the wheel cylinder.
b. Remove the 2 pistons from the wheel cylinder.
c. Remove the spring from the wheel cylinder.
d. Remove the 2 piston cups from each piston.

INSPECTION
1. INSPECT DISASSEMBLED PARTS
Inspect the disassembled parts for wear, rust or damage.





2. MEASURE BRAKE SHOE LINING THICKNESS
Using a ruler, measure the shoe lining thickness.
Standard thickness: 4.0 mm (0.157 inch)
Minimum thickness: 1.0 mm (0.039 inch)
If the thickness is less than the minimum or shoe lining shows signs of uneven wear, replace the brake shoes.

HINT: If a brake shoes needs replacing, the brake shoes must be replaced as a set





3. MEASURE BRAKE DRUM INSIDE DIAMETER
Using a brake drum gauge or equivalent, measure the inside diameter of the drum.
Standard inside diameter: 180.0 mm (7.087 inch)
Maximum inside diameter: 181.0 mm (7.126 inch)
If the drum is scored or worn, the brake drum may be lathed to the maximum inside diameter.





4. INSPECT REAR BRAKE LINING AND DRUM FOR PROPER CONTACT
If the contact between the brake lining and drum is improper, repair the lining with a brake shoe grinder, or replace the brake shoe assembly.

INSTALLATION
Installation is in the reverse order of removal.

NOTICE: Apply lithium soap base glycol grease and high temperature grease to the parts indicated by the arrows.

1. CHECK OPERATION OF AUTOMATIC ADJUSTING MECHANISM
a. Narrow the brake shoe width to the most and install the brake drum.
b. Depress the brake pedal several times.





2. CHECK CLEARANCE BETWEEN BRAKE SHOES AND DRUM
a. Remove the brake drum.
b. Measure the brake drum inside diameter and diameter of the brake shoes. Check that the difference between the diameters is the correct shoe clearance.
Shoe clearance: 0.6 mm (0.024 inch)
If incorrect, check the adjusting lever and adjusting latch.
c. Install the brake drum.
3. FILL BRAKE RESERVOIR WITH BRAKE FLUID
4. BLEED BRAKE SYSTEM
5. CHECK FOR LEAKS
6. INSTALL REAR WHEEL
Torque: 103 Nm (1,050 kgf-cm, 76 ft. lbs.)