Rear Brake Drum and Shoe Inspection
Rear Brake Drum and Shoe InspectionBrake Drum
Inspect brake drum for wear.
If drum inner diameter is exceeds the limit or uneven or stepped wear is excessive, replace the drum.
Drum inner diameter "a"
Standard: 220 mm (8.66 in.)
Limit: 222 mm (8.74 in.)
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 in the direction of drum depth but not circumferentially along drum inner.
NOTE: When drum is removed, visually inspect wheel cylinder for brake fluid leakage. Correct leaky point, if any.
Brake Shoe
Measure thickness of brake shoe (1). Also, check surface of lining for hardening, excessive wear and oil.
Lining thickness "a"
Standard: 4.0 mm (0.157 in.)
Limit: 1.0 mm (0.04 in.)
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.
