Home › CDL Practice Tests › Air Brakes Questions › Question 42
What is the correct way to drain air tanks that have manual drain valves?
- A.Crack the valve for one second once a year
- B.Drain only the last tank in the system
- C.Open each valve fully, let all air and moisture drain, starting with the wet (supply) tank, on a regular schedule
- D.Drain the tanks only while driving downhill
Correct answer
C. Open each valve fully, let all air and moisture drain, starting with the wet (supply) tank, on a regular schedule
Why
A quick puff does not clear the oil and water sitting at the bottom of the tank. Fully draining each tank in sequence, with the wet tank first, is the procedure that actually protects the system.
Manual topic: Air Brakes - Air Tanks and Drains · From the Air Brakes practice bank (AB-042).