2024 IA CDL Practice Test: Double and Triples - Test 2
Based on
2024 IA CDL Handbook
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
Use the tractor parking brake.
C
All of the listed answers.
D
Wait for air pressure reach normal.
E
Open the emergency line shut-off valve at the rear of the last trailer.