jsanz564 Posted July 26, 2008 Share Posted July 26, 2008 i have an r690 and when the trucks loaded, when you hit the brakes i lose about 60 pounds of pressure, ive replaced one chamber when i thought it was damaged, could it be another chamber? or something else Quote Link to comment https://www.bigmacktrucks.com/topic/4041-loosing-air-pressure/ Share on other sites More sharing options...
theakerstwo Posted July 26, 2008 Share Posted July 26, 2008 i have an r690 and when the trucks loaded, when you hit the brakes i lose about 60 pounds of pressure, ive replaced one chamber when i thought it was damaged, could it be another chamber? or something else Yes Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/4041-loosing-air-pressure/#findComment-20840 Share on other sites More sharing options...
WHITE9064TD Posted July 31, 2008 Share Posted July 31, 2008 i have an r690 and when the trucks loaded, when you hit the brakes i lose about 60 pounds of pressure, ive replaced one chamber when i thought it was damaged, could it be another chamber? or something elseYou only have that massive loss of air pressure when the truck is loaded? How bad does it leak when running empty or "bobtailing". Have you tried airing up the truck to 125 psi, block wheels, have the truck ignition to the on position but without the engine running, releasing parking brake and applying the service brake and listening for the leak. Quote Link to comment https://www.bigmacktrucks.com/topic/4041-loosing-air-pressure/#findComment-20940 Share on other sites More sharing options...
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