Drum Brake System: Service and Repair

REMOVAL

HINT: Pre runner is the described.
RZN191L-TRPDKAB, RZN196L-CRPDKAB, RZN196L-PRPDKAB, VZN195L-CRPDKAB, VZN195L-PRPDKAB





1. INSPECT SHOE LINING THICKNESS
Remove the inspection hole plug, and check the shoe lining thickness through the hole.
If less than the minimum, replace the shoes.
Minimum thickness: 1.0 mm (0.039 inch)
2. REMOVE REAR WHEEL
Torque: 110 Nm (1,150 kgf-cm, 83 ft. lbs.)
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 adjusting hole plug in the backing plate.
b. Insert a screwdriver through the hole in the backing plate, and hold the automatic adjusting lever away from the adjusting bolt.
c. Using the other screwdriver, reduce the brake shoe adjustment by turning the adjusting bolt.
5. REMOVE REAR SHOE





a. Using SST, disconnect the return spring from the shoe.
SST 09703-30010
b. Remove the return spring from the front shoe.





c. Using SST, remove the shoe hold-down spring, cups and pin.
SST 09718-00010
d. Remove the adjuster.
e. Using needle-nose pliers, remove the adjusting lever spring.
f. Remove the automatic adjusting lever.
g. Disconnect the anchor spring from the rear shoe and remove the rear shoe.
h. Remove the anchor spring from the front shoe.





6. REMOVE FRONT SHOE
a. Using SST, remove the shoe hold-down spring, cups and pin.
SST 09718-00010
b. Disconnect the parking brake cable from the front shoe.
c. Remove the front shoe and parking brake cable.





7. REMOVE PARKING BRAKE LEVER
a. Using a screwdriver, remove the C-washer.
b. Remove the parking brake lever.
8. REMOVE AND DISASSEMBLE PARKING BRAKE BELLCRANK





a. Remove the clip and disconnect the parking brake cable.
b. Remove the 2 tension springs.
c. Remove the 2 bolts and bellcrank.
Torque: 13 Nm (130 kgf-cm, 9 ft. lbs.)
d. Remove the bellcrank boot from the bellcrank bracket.





e. Using a screwdriver, remove the C-washer and pin.
f. Remove the parking brake bellcrank from the bellcrank bracket.





9. REMOVE WHEEL CYLINDER
a. Using SST, disconnect the brake line. Use a container to catch the brake fluid.
Torque: 15 Nm (155 kgf-cm, 11 ft. lbs.)
SST 09023-00100
b. Remove the 2 bolts and the wheel cylinder.
Torque: 10 Nm (102 kgf-cm, 7.4 ft. lbs.)
10. DISASSEMBLE WHEEL CYLINDER
a. Remove the 2 boots from the wheel cylinder.
b. Remove the 2 pistons and spring.
c. Remove the 2 cups from the each piston.

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





2. MEASURE BRAKE DRUM INSIDE DIAMETER
Using a brake drum gauge or equivalent, measure the inside diameter of the drum.
Standard inside diameter: 295.0 mm (11.614 inch)
Maximum inside diameter: 297.0 mm (11.693 inch)
If the drum is scored or worn, the brake drum may be lathed to the maximum inside diameter.





3. MEASURE BRAKE SHOE LINING THICKNESS
Using a ruler, measure the shoe lining thickness.
Standard thickness: 6.0 mm (0.236 inch)
Minimum thickness: 1.0 mm (0.039 inch)
If the shoe lining is less than the minimum, or shows signs of uneven wear, replace the brake shoes.

HINT: If any of the brake shoes have to be replaced, replace all of the rear brake shoes in order to maintain even braking.





4. INSPECT 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. ADJUST BELLCRANK
a. Lightly pull the bellcrank in direction "A" until there is no slack at part "B".
b. In this condition, turn the adjusting bolt so that dimension "C" will be 0.4 - 0.8 mm (0.016 - 0.031 inch).
c. Lock the adjusting bolt with the lock nut.
d. Connect the parking brake cable to the parking brake bellcrank and install the clip.
e. Install the 2 tension springs.





2. CHECK AUTOMATIC ADJUSTING LEVER
Check that the automatic adjusting lever is properly installed.
If it is not incorrect, check for incorrect installation of the rear brakes.





3. CHECK CLEARANCE BETWEEN BRAKE SHOES AND DRUM
a. Remove the 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: 0.5 mm (0.020 inch)
If it is incorrect, check the parking brake system.
4. FILL BRAKE RESERVOIR WITH BRAKE FLUID
5. BLEED BRAKE SYSTEM
6. CHECK FOR LEAKS