Practice question

After connecting trailer air and electrical lines and raising landing gear, what should the driver do with trailer air?

Supply air to the trailer, establish normal pressure and listen for supply and service connection leaks
Keep the trailer supply valve closed for the whole trip
Disconnect the service line to test emergency braking
Move off without checking because the tug test already passed

Answer: A — Supply air to the trailer, establish normal pressure and listen for supply and service connection leaks

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