cdl practice test

Doubles and Triples Practice Test


Question #1 of 18

How can you test that air flows to all trailers?


Charge the system and pump the brakes with the window down.

Disconnect the glad-hand at the front of the first trailer and listen for air flow.

Only a certified diesel mechanic can check this.

Open the shut-off valves at the rear of the last trailer and listen for air flow.

None of the above.





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