Rear drum brakes [Toyota Land Cruiser J70]

Removal

1. Remove the rear wheel and brake drum.

Note: If the brake drum cannot be removed easily, perform the following operations:

• Insert a screwdriver through the hole in the brake shield and pry the automatic adjustment lever away from the adjusting bolt.
• Using another screwdriver, loosen the brake shoe adjustment by turning the adjusting bolt.

2. Removing the rear brake shoe.

a) Disconnect the return spring from the rear brake shoe.

b) Remove the retainer parts (cups and spring) and a retainer.

c) Remove the rear brake shoe and mounting spring.

3. Removing the front shoe and adjusting device.

a) Remove the retainer parts (cups and spring) and a retainer.

b) Disconnect the adjusting device and return spring from the brake shoe release lever.



c) Remove the adjusting lever spring.





d) Disconnect the inner parking brake cable from the brake shoe release lever.

d) Remove the inner parking brake cable.



4. Removing and disassembling the wheel brake cylinder (if necessary).

a) Disconnect the brake pipe. Drain the brake fluid into the reservoir.

b) Unscrew the two bolts and remove the wheel cylinder.

c) Remove the dust boots, pistons, piston seals and remove the spring from the brake cylinder housing.

6. If necessary, remove and disassemble the parking brake bell crank.

a) Remove the tension springs.

b) Remove the cotter pin.

c) Remove the pin and spring washer, then disconnect the parking brake cable.



d) Loosen the two bolts and remove the parking brake bell crank.





d) Remove the cuff from the parking brake crank arm bracket.

e) Using a screwdriver, remove the retaining ring and pull out the pin.



g) Remove the parking brake bell crank from the bracket.

c) Remove the cuff from the crankshaft.

Examination

1. Measure the brake pad thickness. If the pad thickness is less than the minimum acceptable value or the pad wear is uneven, replace the brake pads.

Standard thickness is 5.0 mm

Minimum thickness - 1.0 mm

Note: If either brake pad needs to be replaced, both pads must be replaced to ensure uniform braking.

2. Measure the inner diameter of the brake drum. If the drum has scoring or excessive wear, it must be bored to the maximum inner diameter.



Maximum internal diameter:

• models produced since 1993 — 297.0 mm
• models produced before 1993 - 256.0 mm

Standard inner diameter:

• models produced since 1993 — 295.0 mm
• models produced before 1993 - 254.0 mm

3. Check the contact of the shoe with the brake drum. If the contact between the shoe and the drum is not in accordance with the standards, grind the lining or replace the entire brake shoe.

4. Check the wheel brake cylinder for signs of corrosion or damage.

5. Check the brake shield for wear or damage.

6. Check the crank arm components for bending, wear or damage.

Replacing brake pads

1. Using a screwdriver, separate the automatic adjustment lever from the front shoe.

2. Using a screwdriver, separate the parking brake shoe lever from the front shoe.



3. Install the brake shoe release lever onto the front shoe and secure it with a new stopper using pliers.



4. Install the automatic adjustment lever with a new retaining ring.

Installation

Note: Install the rear brakes for each wheel as shown in the figure.

1. Assembly and installation of the wheel brake cylinder.

a) Apply lithium-based grease to the piston boots, seals and pistons.



b) Install the spring and piston seals into the brake cylinder body.

Note: The piston seal flanges must face inward.

c) Insert the pistons into the cylinder and install the dust boots.

d) Install the wheel cylinder on the brake shield and secure it with bolts.

Tightening torque - 10 Nm



d) Connect the brake pipe.



Tightening torque - 15 Nm

2. If necessary, assemble and install the parking brake bell crank.

a) Apply lithium based grease to the lever sleeve.



b) Install the cuff onto the parking brake bell crank.

c) Install the parking brake bell crank onto the bracket.

d) Install the pin and secure it with a new retaining ring.



d) Secure the parking brake bell crank (assembly) to the brake shield using two bolts.

Tightening torque - 13 Nm

e) Connect the inner parking brake cable to the bell crank and secure with a pin, spring washer and cotter pin.

3. Apply high-melting grease to the contact surfaces of the pads and the brake shield (see picture).



4. Apply high-temperature grease to the threads of the adjusting bolt and the end sections of the device.





5. Installing the inner parking brake cable.

a) Connect the inner parking brake cable to the bell crank as shown in the figure.



b) Connect the inner parking brake cable to the brake shoe release lever.

6. Connecting the adjusting device to the front shoe.

a) Install the adjuster with return spring on the front shoe.



b) Install the adjusting lever spring.



7. Installing the front pad.

a) Install the front shoe into place and insert the end of the shoe into the piston.

b) Install the retainer parts (cups and spring) and a retainer.



8. Installing the rear shoe.

a) Install the retaining spring between the front and rear pads.



b) Install the rear shoe in place and insert one end of it into the piston.

c) Install the retainer parts, (cups and spring) and a retainer.

d) Connect the rear shoe to the return spring.



9. Checking the operation of the automatic adjustment mechanism.

a) Move the inner parking brake cable back until the automatic adjustment lever is clear of the adjusting bolt. Check that the adjusting bolt rotates easily. If the bolt does not rotate, check that the rear shoes are installed correctly.

b) Using the adjusting device, set the minimum clearance between the shoe and the brake drum.

c) Install the brake drum.

d) Move the parking brake lever up and down until the clicking sound disappears.

10. Checking the gap between the brake shoes and the drum.

a) Remove the brake drum.

b) Measure the inner diameter of the brake drum and the outer diameter of the brake shoes. Make sure that the difference between these diameters provides the required clearance.

Gap - 0.6 mm



c) If the gap does not meet the standards, check the parking brake system.

11. Adjusting the crank arm (if necessary).

a) Move the crank slightly in direction "A" until the gap at part "B" is selected.

b) Then rotate the adjusting bolt until clearance "C" is obtained.

Gap "C" - 0.2-0.7 mm



c) Lock the adjusting bolt with the lock nut.

d) Install two tension springs.



12. Install the brake drum and rear wheel.

13. Fill the reservoir with brake fluid and bleed the brake system.

14. Check the system for leaks.