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Question
When coupling, after you've connected the air lines to the trailer, you should:
Answers
A.  Supply air to the trailer.
B.  Activate the emergency brake.
C.  Disconnect the glad hands.
Explanation
Correctly following the steps to couple and uncouple trailers is vital to safely operating a combination vehicle. After connecting the air lines to the trailer while coupling, you should supply air to the trailer.

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