Home › CDL Practice Tests › Air Brakes Questions › Question 217
When should manual air tank drains normally be opened?
- A.Only at the annual inspection
- B.Only when the low air warning sounds
- C.At the end of each day of driving, or as the vehicle maker directs, until air escapes and the collected moisture is blown out
- D.While driving at highway speed to use road airflow
Correct answer
C. At the end of each day of driving, or as the vehicle maker directs, until air escapes and the collected moisture is blown out
Why
Daily draining keeps the normal build-up of water and oil from reaching a harmful level. The drain is opened fully so pressure can expel the liquid, not merely cracked until a drip appears.
Manual topic: Air Brakes - Air Tanks and Draining · From the Air Brakes practice bank (AB-217).