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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 Combination Vehicles Practice Test
Question 1 of 3
Where are the shut off valves?
A
At the front of trailers
B
In the tractor cab
C
At the back of trailers
D
At the back of the tractor
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