Drum Brake System: Service and Repair

REMOVAL
1. Remove the wheel and tire, then remove the brake drum.





NOTE
If the brake drum is difficult to remove, insert bolts into the threaded holes of the drum, then remove it.

2. After removing the nut, remove the rear hub with the brake drum.





3. Remove the abut end shoe spring, cylinder and shoe spring, shoe hold down spring.
4. Remove the shoes and adjuster as an assembly.

WHEEL CYLINDER REPLACEMENT





1. Remove the brake shoe.
2. Disconnect the brake tube.
3. Remove the wheel cylinder assembly.
4. Remove the dust boot.
5. Remove the piston and piston cup.
6. Drive out the return spring.





7. Before assembling the wheel cylinder, inspect the following points.
1) Check the cylinder and piston for wear, damage and rust.

Clearance of piston and cylinder (mm):
Standard value: 0.039 - 0.089

2) Check the cylinder body for damage and cracks.
3) Check the contact surface of the piston and shoes for wear.
4) Check the piston spring for looseness.
8. Assembly is the reverse of the removal procedure.

NOTE
1) Clean the cylinder and inner part with isopropyl alcohol before assembly.
2) Apply enough brake fluid to piston cups and cylinder.
3) Be sure to use new piston cups and dust boots.

CAUTION
Be careful not to lose the steel ball in the bleeder.

INSPECTION





1. Measure the brake drum inside diameter.
Check the runout of brake drum using a dial indicator.

Standard value:
Inside diameter: 228.6 mm (9 inch)
2.0 DOHC: 225 mm (8.858 inch)
Limit:
Inside diameter: 230.6 mm (9.08 inch)
2.0 DOHC: 227 mm (8.936 inch)
Out-of-round of brake drum: 0.015 mm





2. Measure the brake shoe lining thickness.

Standard value:
Lining thickness: 4.45 mm (0.175 inch)
2.0 DOHC: 5.89 mm (0.231 inch)
Limit:
Lining thickness: 1.5 mm (0.059 inch)
2.0 DOHC: 0.8 mm (0.031 inch)





3. Inspect the brake lining and drum for proper contact.
4. Inspect the wheel cylinder outside for excessive corrosion and damage.
5. Inspect the backing plate for wear or damage.

INSTALLATION





1. Apply the specified grease to the locations indicated in the illustration and to each component.
- Shoe and backing plate contact surfaces
- Shoe and anchor plate contact surfaces

Recommended grease: Multipurpose grease SAE J310, NLGI No.2





2. Install the shoe hold down pin.





3. Assemble the return spring with the push rod shortened.

CAUTION Split pin and hub cap must not be reused.

4. After assembling the drum components, pull the parking brake lever all the way up several times.