nbone28 Posted 6 hours ago Share Posted 6 hours ago 2015 Mack Pinnacle cxu613, when I go to push in the air supply for the trailer (and when i release it) air is pissing out from underneath my hood. I’m not losing air when I go to brake, it’s only when I go to engage or disengage to air supply for the trailer. It’s pissing out of the top yellow airline in the photo. It looks like there is a valve behind the firewall, could that be what’s causing this? Thanks for the input. Quote Link to comment https://www.bigmacktrucks.com/topic/75901-air-pissing-out/ Share on other sites More sharing options...
mechohaulic Posted 4 hours ago Share Posted 4 hours ago did you try and dead head the lines to trailer then push the buttons in ?? might help eliminate whether issue is with truck or back feed from trailer. where in CT is this truck located?? 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75901-air-pissing-out/#findComment-581514 Share on other sites More sharing options...
mechohaulic Posted 4 hours ago Share Posted 4 hours ago yellow lines are the exhaust ports I believe, 2015 way new for me to be certain. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75901-air-pissing-out/#findComment-581515 Share on other sites More sharing options...
nbone28 Posted 12 minutes ago Author Share Posted 12 minutes ago 4 hours ago, mechohaulic said: did you try and dead head the lines to trailer then push the buttons in ?? might help eliminate whether issue is with truck or back feed from trailer. where in CT is this truck located?? Trucks over in the New Haven area. It’s only occurring when engaging and releasing the air supply to the trailer. I’m not losing air when I go to brake. Quote Link to comment https://www.bigmacktrucks.com/topic/75901-air-pissing-out/#findComment-581528 Share on other sites More sharing options...
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