Suzuki SY413 Service Manual page 1746

5-52 BRAKES
BRAKE DRUM AND COMPONENTS
INSPECTION
INSPECT BRAKE DRUM
Inspect drum for cleanliness. Check wear of its braking surface by
measuring its inside diameter.
Brake drum ID
Standard : 200 mm (7.87 in.)
Service limit : 202 mm (7.95 in.)
Whenever brake drums are removed, they should be thoroughly
cleaned and inspected for cracks, scores, deep grooves.
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 re-
surface 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.