Home › CDL Practice Tests › General Knowledge Questions › Question 106
On a vehicle with a dual air brake system, what does having two separate systems give you?
- A.Twice the normal braking power in every stop
- B.A spare compressor that starts automatically
- C.If one system loses pressure, the other can still operate brakes on its own set of axles
- D.Air conditioning for both cab and sleeper
Correct answer
C. If one system loses pressure, the other can still operate brakes on its own set of axles
Why
Dual systems split the axles between a primary and a secondary circuit, each with its own tanks and gauge. A leak in one circuit leaves the other able to bring the vehicle to a controlled stop.
Manual topic: Air Brakes - Dual Systems · From the General Knowledge practice bank (GK-106).