Brake drums (or discs) must not have cracks longer than:

1/2 the width of the friction area.. Section 2.1 (and 5.1): Brake drums must not have cracks longer than one half the width of the friction

Brake drums (or discs) must not have cracks longer than:

ANSWER BREAKDOWN
  • A. Correct. Section 2.1 (and 5.1): Brake drums must not have cracks longer than one half the width of the friction area.
  • B. Incorrect. "1/4 the width of the friction area." is not correct. Section 2.1 (and 5.1): Brake drums must not have cracks longer than one half the width of the friction area.
  • C. Incorrect. "1 inch." is not correct. Section 2.1 (and 5.1): Brake drums must not have cracks longer than one half the width of the friction area.
  • D. Incorrect. "Any crack is unsafe." is not correct. Section 2.1 (and 5.1): Brake drums must not have cracks longer than one half the width of the friction area.