Cracks in a brake drum must not be longer than:

One half the width of the friction area.. Section 5.1: 1/2 width of the friction area is the out-of-service limit.

Cracks in a brake drum must not be longer than:

ANSWER BREAKDOWN
  • A. Correct. 1/2 width of the friction area is the out-of-service limit.
  • B. Incorrect. "One inch." is not correct. 1/2 width of the friction area is the out-of-service limit.
  • C. Incorrect. "The full width." is not correct. 1/2 width of the friction area is the out-of-service limit.
  • D. Incorrect. "1/4 inch." is not correct. 1/2 width of the friction area is the out-of-service limit.