Drum Brake System: Service and Repair

REMOVAL

Inspect Shoe Lining Thickness:

1. Inspect shoe lining thickness.
Remove the inspection hole plug, and check the shoe lining thickness through the hole.
If it is less than the minimum, replace the shoes.
Minimum thickness: 1.0 mm (0.0 3. inch)
2. Remove rear wheel.
3. 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 another screwdriver, reduce the brake shoe adjustment by turning the adjusting bolt.
4. Remove rear shoe.

Remove Rear Shoe (Part 1 Of 2):

a. Using Special Service Tool (SST) 09703-30010 or equivalent, disconnect the return spring.

Remove Rear Shoe (Part 2 Of 2):

b. Using SST 09718-00010, remove the shoe hold-down spring, cups and pin.
c. Disconnect the anchor spring from the rear shoe and remove the rear shoe.
d. Remove the anchor spring from the front shoe.
5. Remove front shoe.

Remove Front Shoe:

a. Using (SST), remove the shoe hold-down spring, cups and pin.
b. Remove the return spring from the front shoe.
c. Disconnect the parking brake cable No.1 from the parking brake bellcrank No.3.
d. Remove the front shoe with adjuster.
e. Disconnect the parking brake cable from the front shoe.
6. Remove adjuster from front shoe.
a. Remove the adjusting lever spring.
b. Remove the adjuster.

Remove E-Ring And C-Washer:

7. Remove automatic adjusting lever and parking brake lever.
a. Remove the E-ring.
b. Remove the automatic adjusting lever.
c. Remove the C-washer.
d. Remove the parking brake lever.
8. Remove and disassemble parking brake bellcrank.

Remove And Disassemble Parking Brake Bellcrank (Part 1 Of 3):

a. Remove the clip and disconnect the parking brake cable.
b. Remove the tension spring.

Remove And Disassemble Parking Brake Bellcrank (Part 2 Of 3):

c. Using a screwdriver, remove the bellcrank No.3 from the backing plate with the parking brake cable No.2.
d. Remove the parking brake bellcrank No.1 or No.2 and dust cover with the 2 bolts.
Torque: 13 Nm (9 ft. lbs.)
e. Remove the bellcrank boot from the bellcrank bracket.





f. Remove the C-washer and pin.
g. Remove the parking brake bellcrank from the bellcrank bracket.
9. Remove wheel cylinder.

Remove Wheel Cylinder:

a. Using SST 09751-36011, disconnect the brake line. Use a container to catch the brake fluid.
Torque: 15 Nm (11 ft. lbs.)
b. Remove the 2 bolts and the wheel cylinder.
Torque: 10 Nm (7 ft. lbs.)
10. Disassemble wheel cylinder.
Remove these parts from the wheel cylinder.
- 2 boots
- 2 pistons
- 2 piston cups
- Spring

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.

Fig. 10 Bellcrank Adjustment. Land Cruiser, Pickup & 4Runner 4WD:

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.

Adjust Bellcrank (Part 2 Of 2):

d. Connect the parking brake cable to the parking brake bellcrank and install the clip.
e. Install the tension spring.
2. Check operation of automatic adjusting mechanism.





a. Move the parking brake lever of the front shoe back and forth. Check that the adjuster turns.
If the adjuster does not turn, check for incorrect installation of the rear brakes.
b. Adjust the adjuster length as short as possible.
c. Install the brake drum.





d. Pull the parking brake lever all the way up until a clicking sound can no longer be heard.
3. Check clearance between brake shoes and drum.
a. Remove the drum.

Check Clearance Between Brake Shoes And Drum:

b. Measure the brake drum inside diameter.
c. Measure the distance between 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 parking brake system.
4. Fill brake reservoir with brake fluid and bleed brake system.
5. Check for leaks.