Drum Brake System: Service and Repair

REMOVAL

WARNING: Clean brake lining with a vacuum dust collector to minimize the hazard of airborne materials.

CAUTION: Make sure parking brake lever is completely released.

1. Release parking brake lever fully, then remove drum.
- If drum is hard to remove, the following procedure should be carried out.





a. Remove plug, then shorten adjuster to make clearance between brake shoe and drum.





b. Install two bolts as shown. Tighten the two bolts gradually.

Brake Shoe Removal:

2. After removing retainer, remove spring by rotating shoes.
- Be careful not to damage wheel cylinder piston boots.
- Be careful not to damage parking brake cable when separating it.
3. Remove adjuster.
4. Disconnect parking brake cable from toggle lever.

Toggle Lever Pin Removal:

5. Remove retainer clip with a suitable tool. Then separate toggle lever and brake shoe.

INSPECTION-WHEEL CYLINDER





- Check wheel cylinder for leakage.





- Check for wear, damage and loose conditions. Replace if any such condition exists.

WHEEL CYLINDER OVERHAUL
- Check all internal parts for wear, rust and damage. Replace if necessary.
- Pay attention not to scratch cylinder when installing pistons.

INSPECTION-DRUM





Maximum inner diameter (Repair limit):
LT26B 261.5 mm (10.30 inch)
LT30A 296.5 mm (11.67 inch)

- Contact surface should be finished with No. 120 to 150 emery sandpaper.
- Using a brake lathe, machine brake drum if it shows score marks, partial wear or stepped wear.
- After brake drum has been completely reconditioned or replaced, check drum and shoes for proper contact pattern.

INSPECTION-LINING

Measuring Brake Lining:

Check lining thickness.

Standard lining thickness:
LT26B 5.5 mm (0.217 inch)
LT30A 6.1 mm (0.240 inch)
Lining wear limit (A):
LT26B 1.5 mm (0.069 inch)
LT30A 1.5 mm (0.069 inch)

INSTALLATION
- Always perform shoe clearance adjustment.
- Burnish the brake contact surfaces after refinishing or replacing drums or rotors, after replacing pads or linings, or if a soft pedal occurs at very low mileage. Refer to "Brake Burnishing Procedure". Service and Repair
1. Fit toggle lever to brake shoe with retainer clip.





2. Apply brake grease to the contact areas shown.








3. Shorten adjuster by rotating it.
- Pay attention to direction of adjuster.
4. Connect parking brake cable to toggle lever.
5. Install all parts.
- Be careful not to damage wheel cylinder piston boots.

Parking Brake Cable To Toggle Lever:

6. Check all parts are installed properly.
- After installation is completed, adjust shoe-to-drum clearance.
7. Install brake drum.
8. When installing new wheel cylinder or overhauling wheel cylinder, bleed air. Service and Repair
9. Adjust parking brake.
- Install all the parts by referring to the figure shown.

LT30A MODEL








- After installing crank lever on back plate, make sure that there is no play between crank lever and back plate. If play exists, adjust bolt (A) and lock nut (B).