Cracked, Scored, or Grooved Drums

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

Light scoring of the drum surface not exceeding 1.0 mm (0.040 inch) in depth, which may result from normal use, is not detrimental to brake operation.

A drum with a grooved surface finish can be reconditioned using 80 grit sandpaper with the drum mounted and rotating on a brake lathe. An inboard/outboard sanding motion will produce a multi-directional finish on the drum.