Brake Drum: Service and Repair
Removal1. Hoist vehicle and pull up parking brake lever.
2. Remove wheel.
3. Release parking brake lever.
4. Remove parking brake lever cover screws and with rear part of brake lever cover (1) lifted a little, loosen parking brake cable locking nut (2).
5. Remove brake drum (1) by using 8 mm bolts (2) (2 pcs).
Installation
1. Before installing brake drum, check outer diameter of brake shoes (3). If it is not within value as specified, adjust it to specification by turning adjuster (2).
Rear brake shoe outer diameter
"a": 253.3 - 253.7 mm (9.972 - 9.988 inch)
2. Install brake drum after making sure that inside of brake drum and brake shoes are free from dirt and oil.
3. Upon completion of all jobs, depress brake pedal with about 30 kg (66 lbs) load 3 to 10 times so as to obtain proper drum-to-shoe clearance.
Adjust parking brake cable.
4. Tighten parking brake lever cover screws.
5. Install wheel and tighten wheel nuts to specified torque.
Tightening torque
Wheel nut (b): 100 Nm (10.0 kgf-m, 72.5 ft. lbs.)
6. Check to ensure that brake drum is free from dragging and proper braking is obtained. Then remove vehicle from hoist and perform brake test (foot brake and parking brake).
Inspection
Brake Drum
Inspect drum for cleanliness. Check wear of its braking surface by measuring its inside diameter.
Whenever brake drums are removed, they should be thoroughly cleaned and inspected for cracks, scores, deep grooves.
Brake dram inside diameter "a"
Standard: 254 mm (8.66 inch)
Service Limit: 256 mm (8.74 inch)
Cracked, Scored, or Grooved Drum
A cracked, drum is unsafe for further service and must be replaced. Do not attempt to weld a cracked drum.
Smooth up any slight scores. Heavy or extensive scoring will cause excessive brake lining wear and it will probably be necessary to resurface drum braking surface.
If brake linings are slightly worn and drum is grooved, drum should be polished with fine emery cloth but should not be turned.
NOTE: When drum is removed, visually inspect wheel cylinder for brake fluid leakage. Correct leaky point, if any.
Brake shoe
Where lining is worn out beyond service limit, replace shoe.
If one of brake linings is to service limit, all linings must be replaced at the same time.
Rear brake drum shoe thickness "a"
Standard: 7.1 mm (0.28 inch)
Service limit: 3.6 mm (0.14 inch)
CAUTION: Never polish lining with sandpaper. If lining is polished with sandpaper, hard particles of sandpaper will be deposited in lining and may damage drum. When it is required to correct lining, replace it with a new one.