Home › CDL Practice Tests › Air Brakes Questions › Question 150
During the inspection of disc brakes, which condition should be reported?
- A.Pads that are evenly worn and above the minimum thickness
- B.A caliper that is secure and moves as designed
- C.A rotor surface that is clean and dry
- D.A rotor that is cracked, badly scored, or contaminated, or pads worn beyond the maker's limit
Correct answer
D. A rotor that is cracked, badly scored, or contaminated, or pads worn beyond the maker's limit
Why
Disc brakes depend on flat, clean rotor surfaces and pad material thick enough to handle heat. Cracked or contaminated parts reduce friction and can warp or fail, so they belong on the inspection report, not on the road.
Manual topic: Air Brakes - Brake Inspection · From the Air Brakes practice bank (AB-150).