Which conditions are brake-system defects?
Correct answer: D. – All of the above
Cracked drums can compromise the braking assembly. Oil, grease, or brake fluid on shoes or pads can interfere with the friction needed for effective braking. Shoes that are dangerously thin, missing, or broken are also listed brake defects, making every condition in the choices a problem.
Source: Virginia Commercial Driver’s License Manual — § 2.1.3, “What to Look For”

