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  1. fasttruck

    New guy here (again): Can I pull a pup dump trailer with M939? Air brake question...

    The "Johnny brake" or hand applicator valve typically controls the brakes on the trailer independent of the tractor. They apparently can be plumbed on a straight truck to operate all the service brakes. I have seen tractors with 2 hand applicator valves which would suggest one for the tractor...
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