Home › CDL Practice Tests › Air Brakes Questions › Question 248
Why does a trailer need its own air tanks instead of relying only on air sent from the tractor?
- A.Trailer tanks are only storage for spare glad hands
- B.The tractor cannot send any air to a trailer
- C.Trailer tanks replace the trailer spring brakes
- D.Trailer tanks store the air that applies and releases the trailer brakes locally, giving immediate response and a reserve for emergency brake operation
Correct answer
D. Trailer tanks store the air that applies and releases the trailer brakes locally, giving immediate response and a reserve for emergency brake operation
Why
Local storage shortens response and provides the volume the trailer chambers need for full applications. It also supports the emergency system that applies the trailer brakes when supply is lost.
Manual topic: Air Brakes - Trailer Air Brakes · From the Air Brakes practice bank (AB-248).