Home › CDL Practice Tests › Air Brakes Questions › Question 44
Which tank usually collects the most moisture and should be drained first?
- A.The secondary dry tank only
- B.The trailer tank on a bobtail tractor
- C.The fuel tank sump
- D.The wet tank (supply tank) closest to the compressor
Correct answer
D. The wet tank (supply tank) closest to the compressor
Why
Air leaves the compressor hot and wet, and most condensation happens in the first tank it reaches. Draining that wet tank first removes the bulk of the water before it can move deeper into the system.
Manual topic: Air Brakes - Air Tanks and Drains · From the Air Brakes practice bank (AB-044).