GEORGIADAWG30809 Posted May 14, 2010 Share Posted May 14, 2010 I HAVE A 1999 RD AND THE PARK BRAKE VALVE SOMETIMES WILL NOT STAY IN. OTHER TIMES I HAVE TO HOLD IT IN FOR A FEW MINUTES TO GET IT TO STAY IN. Quote Link to comment https://www.bigmacktrucks.com/topic/13903-park-brake-valve/ Share on other sites More sharing options...
e9500v8 Posted July 13, 2010 Share Posted July 13, 2010 I HAVE A 1999 RD AND THE PARK BRAKE VALVE SOMETIMES WILL NOT STAY IN. OTHER TIMES I HAVE TO HOLD IT IN FOR A FEW MINUTES TO GET IT TO STAY IN.Take the supply line off the park brake valve and see how good the flow of air is I bet you have a air restriction to the park brake valve!! Quote Link to comment https://www.bigmacktrucks.com/topic/13903-park-brake-valve/#findComment-59428 Share on other sites More sharing options...
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