Brake Drum: Service and Repair

REAR DRUM BRAKE





COMPONENTS

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 rear hub bearing flange nut, remove the rear hub with the brake drum.
3. Remove the shoe return spring, cylinder end shoe spring, the 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.
1) Check the cylinder and piston for wear, damage and rust.
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.

NOTE:
^ Clean the cylinder with isopropyl alcohol before assembly.
^ Apply enough brake fluid to piston cups and cylinder.
^ 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 inside diameter of the brake drum. Check the runout of brake drum by using a dial indicator.








2. Measure the brake shoe lining thickness.
3. Inspect the brake lining and drum for proper contact.
4. Inspect the wheel cylinder outside for excessive wear 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 by pressing the push rod.

CAUTION: Split pin and hub cap must not be reused.





4. Check the outside dimension and correct it using auto-adjuster (227.6 - 228.1 mm).
5. Do the parking brake stroke adjustment after assembling lining.