Technician A says the discard dimension of a brake drum is the drum's allowable machining dimension. Technician B says a drum may be machined and used if within 10 percent of the discard dimension. Who is correct?

Question

Quizplus · Accepted Answer

The discard dimension of a brake drum is the maximum allowable diameter to which the drum can be safely machined or worn before it must be replaced, not the allowable machining dimension. A drum should not be used if it is at or beyond this discard dimension, not within 10 percent of it.

Technician a Says the Discard Dimension of a Brake Drum