house Posted April 19, 2019 Report Share Posted April 19, 2019 My truck, a 2011 Prostar does not hold air well to say the least, I have fixed a couple of major leaks but now it has started doing something odd, The primary Air system charges up to 90 before the secondary builds pressure. It seems like this i new issue, from my recollection they both used to build together. but now they dont, any idea why this may have started happening? once both tanks get up to pressure they seem to hold well enough, but still it makes it so you have to build air for a long time before you can drive off. Link to comment Share on other sites More sharing options...
ARGO Posted April 19, 2019 Report Share Posted April 19, 2019 May be a stuck check valve between the 2 tanks, possibly so you can't lose air both tanks at once, safety. You'd have to see the movie to understand.......... Link to comment Share on other sites More sharing options...
dan412 Posted April 20, 2019 Report Share Posted April 20, 2019 On my work peterbilt The primary air builds first then secondary. 2011 Volvo D13 485/1750 Eaton 13 Speed 2016 Montana 3820FK Link to comment Share on other sites More sharing options...
GeorgiaHybrid Posted April 20, 2019 Report Share Posted April 20, 2019 Your primary will build up to 90 to 100 psi and then the secondary will start building pressure until it matches the primary pressure and then they will both build up together until both are at full pressure. 2017 Kenworth T6802015 DRV 38RSSA Elite Suites2016 Smart Prime Link to comment Share on other sites More sharing options...
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