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Question
Before backing your tractor under the trailer, make sure your trailer brakes are:
Answers
A.  Disengaged.
B.  Locked.
C.  Deactivated.
D.  Dry.
Explanation
Correctly following the steps to couple and uncouple trailers is vital to safely operating a combination vehicle. Before backing your tractor under the trailer while coupling, make sure your trailer brakes are locked.

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