Oregon CDL Double/Triple Trailers Practice Test

Before you can supply air to the air tanks of a second trailer you need to:

Close the shut off valves at the rear of both trailers Open the shut off valves at the rear of both trailers Open the shut off valves at the rear of the first trailer, and close the shut off valves at the rear of the second trailer

Correct Answer:

Open the shut off valves at the rear of the first trailer, and close the shut off valves at the rear of the second trailer

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