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CDL Practice Test
General Knowledge
Air Brakes
Combination Vehicles
Doubles and Triples
Tanker Vehicles
Hazardous Materials
Transporting Passengers
CDL Air Brakes Practice Test
Question 1 of 3
You should use the parking brake:
A
Whenever you're away from the vehicle
B
When air brake pressure is low
C
Whenever you're traveling down a grade
D
Whenever you're parked on a grade
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