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CDL Practice Test
General Knowledge
Air Brakes
Combination Vehicles
Doubles and Triples
Tanker Vehicles
Hazardous Materials
Transporting Passengers
CDL Doubles and Triples Practice Test
Question 1 of 3
When might you consider disconnecting the steering axle brakes to help keep a tractor straight?
A
Never
B
Whenever necessary
C
When the road is slippery
D
When driving on a grade
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