doubles and triples test
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Doubles and Triples CDL Test

Question #1 of 15

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 shutoff valves at the rear of the last trailer and listen for air flow.

None of the above.








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