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Question:

After supplying air to the trailer, how should you check for crossed air lines?

A These are all steps to be sure that the air lines are connected properly.
explanation

Check brake system for crossed air lines. Shut off engine so you can hear the brakes. Apply and release trailer brakes and listen for sound of trailer brakes being applied and released. You should hear the brakes move when applied and air escape when the brakes are released. Check air brake system pressure gauge for signs of major air loss.

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