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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
Slack adjusters adjust which of the following?
A
Slack in the brakes
B
Slack in the service line
C
Air tank pressure
D
Spring brake tension
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