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Question:

After you supply air to the trailer, make sure the air lines are not crossed and the trailer brakes are working. This is done by:

A Applying and releasing the trailer brakes and listening for the sound of the brake.
Explaination

Step 8: Supply Air to Trailer - Check the brake system for crossed air lines: Apply and release the trailer brakes and listen for the sound of trailer brakes being applied and released. You should hear the brakes move when applied and air escape when the brakes are released.