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Air Brakes
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CDL Practice Test
General Knowledge
Air Brakes
Combination Vehicles
Doubles and Triples
Tanker Vehicles
Hazardous Materials
Transporting Passengers
CDL Practice Test
Question 1 of 3
How should the shut off valves be set on a double trailer?
A
Rear of front trailer open, rear of back trailer open
B
Rear of front trailer closed, rear of back trailer closed
C
Rear of back trailer open, rear of front trailer closed
D
Rear of front trailer open, rear of back trailer closed
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