Question 7 of 20
Score: 0/0How do you send air to the trailer’s air tanks?
ExplanationTo fill the trailer’s air tanks, you need to push in the trailer air supply valve, which allows air to flow into the system.
Missing these? The CDL Study Bundle turns the rules you keep getting wrong into one quick reference.
Next Question →
Did you know? Know which line is supply and which is service, and what happens when the emergency line loses air.
← Back to Combination Vehicles tests