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In yard operations where drivers hook and drop trailers all day, the Capacity Trailer Brake Control Valve lets the driver apply trailer brakes independently of the tractor. Holding the trailer with its own brakes steadies it while the tractor backs under or pulls away from a dock. When the old valve leaks air or binds at the control, the Capacity 150413 brings smooth, graduated application back. Yard drivers then have finer control during the tight maneuvers that fill their shift.
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