Home › CDL Practice Tests › Air Brakes Questions › Question 230
What problem can sludge and corrosion from neglected tanks cause in brake valves?
- A.Cleaner valve action because sludge lubricates moving parts
- B.Higher governor cut-out pressure only
- C.Debris and rust can make valves stick, leak, or respond slowly, causing uneven application or brakes that drag
- D.No effect, because valves filter everything out
Correct answer
C. Debris and rust can make valves stick, leak, or respond slowly, causing uneven application or brakes that drag
Why
Brake valves work with small clearances and clean air, so contaminated supply air attacks their reliability directly. Regular draining is therefore a brake performance measure, not just housekeeping.
Manual topic: Air Brakes - Air Tanks and Draining · From the Air Brakes practice bank (AB-230).