Brake Drum: Testing and Inspection

1. Inspect the drum for cleanliness.
2. Check the wear of its braking surface by measuring its inside diameter.
^ The inside diameter "a" (standard value) is 220 mm (8.66 inch.) and the service limit is 222 mm (8.74 inch.).
^ Whenever the brake drums are removed, they should be thoroughly cleaned and inspected for cracks, scores and deep grooves.

CAUTION: A cracked, drum is unsafe for further service and must be replaced. Do not attempt to weld a cracked drum.

3. 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.

NOTE:
^ If brake linings are slightly worn and the drum is grooved, the drum should be polished with fine emery cloth but should not be turned.
^ When drum is removed, visually inspect wheel cylinder for brake fluid leakage. Correct leaky point, if any.