CDL Practice Tests

Doubles and Triples Test

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Question #1 of 24

Doubles and Triples Test Question Image

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 airflow.

Only a certified diesel mechanic can check this.

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

None of the above.

 

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Combination Vehicles (Learning) | Hazardous Materials (Learning) | Doubles & Triples (Learning)

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