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Message: <blockquote data-quote="olroadbeech" data-source="post: 3621941" data-attributes="member: 52145">if there is no air to dolly or rear box , they will not move. they need the air to release brakes. that is why when you do your walkaround you turn on the air valves on the back box to see that air is going thru the system. if not , then you did not turn air valves on from back of front trailer. Or you did not hook up air lines right.  Just like Trick said. This is part of pre-trip. When in doubt ask another feeder driver to walk you through it. Better safe......</blockquote>