Home › CDL Practice Tests › Air Brakes Questions › Question 36
What is the purpose of the air reservoirs (tanks)?
- A.To store diesel fuel for the compressor
- B.To cool the engine coolant
- C.To hold spare brake fluid
- D.To store compressed air so brakes can be applied several times even if the compressor stops
Correct answer
D. To store compressed air so brakes can be applied several times even if the compressor stops
Why
Reservoirs are the system's savings account, holding enough air for multiple brake applications. That reserve is what lets a driver stop safely after an engine or compressor failure.
Manual topic: Air Brakes - Air Tanks and Drains · From the Air Brakes practice bank (AB-036).