landon7320 Posted April 25, 2021 Share Posted April 25, 2021 Im getting a old R model back on the road and the issue Im having right now is no air at the dash valves. The truck airs up good and even holds air overnight. When you press the brake pedal the brakes work as they should, but i cant release the parking brake as the button has no air to it. How are these supposed to be plumbed or could the dash valve be the culprit? Quote Link to comment https://www.bigmacktrucks.com/topic/66600-serivce-brakes-work-but-no-air-to-dash-valves/ Share on other sites More sharing options...
Nobody454 Posted April 27, 2021 Share Posted April 27, 2021 does it have 3 air buttons? Quote Link to comment https://www.bigmacktrucks.com/topic/66600-serivce-brakes-work-but-no-air-to-dash-valves/#findComment-473053 Share on other sites More sharing options...
doubleclutchinweasel Posted April 28, 2021 Share Posted April 28, 2021 The year model might also help. There have been a few different brake systems on the Rs. I have some air diagrams, but they are in the service book. Makes them hard to copy. Quote "Eagles may soar, but weasels don't get sucked into jet engines." Link to comment https://www.bigmacktrucks.com/topic/66600-serivce-brakes-work-but-no-air-to-dash-valves/#findComment-473098 Share on other sites More sharing options...
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