Home › CDL Practice Tests › Air Brakes Questions › Question 155
If you find a brake that is dragging after the pedal is released during inspection, what is the likely effect if it is driven that way?
- A.Dragging improves downhill control and saves the other brakes
- B.The dragging brake will overheat, wear rapidly, lose effectiveness, and may start a fire
- C.Heat from dragging dries the linings and restores friction
- D.Only fuel use is affected, not safety
Correct answer
B. The dragging brake will overheat, wear rapidly, lose effectiveness, and may start a fire
Why
A brake that never fully releases converts motion into heat for every mile it is driven. That heat destroys linings and seals, expands the drum, and can leave the vehicle with a faded or burning brake.
Manual topic: Air Brakes - Brake Inspection · From the Air Brakes practice bank (AB-155).