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2024 MT CDL Practice Test: Double and Triples - Test 2

13. What do you need to do to check that air flows to all trailers?
A
Push in the red "trailer air supply" knob
B
Open the emergency line shut-off valve at the rear of the last trailer.
C
All of the listed answers.
D
Use the tractor parking brake.
E
Wait for air pressure reach normal.
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Double and Triples - Test 2
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