nbone28 Posted 13 hours ago Share Posted 13 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 11 hours ago Share Posted 11 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 11 hours ago Share Posted 11 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 6 hours ago Author Share Posted 6 hours 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...
mechohaulic Posted 5 hours ago Share Posted 5 hours ago air is constant leak out the exhaust yellow line when you push in the red button to release trailer brakes ;; correct??? do you pull same trailer or others?? same we continue ; other trailers being hooked to , does exhaust still leak,?? attempt here is to verify the truck has the issue 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75901-air-pissing-out/#findComment-581534 Share on other sites More sharing options...
Joey Mack Posted 4 hours ago Share Posted 4 hours ago Heck, un hook the emergency line on each trailer brake chamber and cap the line. Then release the brakes and check for the leak. Do one at a time, hooking the removed line back up before going to another chamber. If the leak goes away, the the chamber with the line removed has a diaphragm leak. You can put a piggy back on it, or replace the whole chamber.. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75901-air-pissing-out/#findComment-581539 Share on other sites More sharing options...
Mark T Posted 4 hours ago Share Posted 4 hours ago This didn't happen to start after that foot valve was changed, did It ? Quote Link to comment https://www.bigmacktrucks.com/topic/75901-air-pissing-out/#findComment-581542 Share on other sites More sharing options...
mechohaulic Posted 1 hour ago Share Posted 1 hour ago 3 hours ago, Joey Mack said: Heck, un hook the emergency line on each trailer brake chamber and cap the line. Then release the brakes and check for the leak. Do one at a time, hooking the removed line back up before going to another chamber. If the leak goes away, the the chamber with the line removed has a diaphragm leak. You can put a piggy back on it, or replace the whole chamber.. i wasn't to successful getting the trailer lines disconnected and dead headed to eliminate trailer i guess. no reply as to one trailer involved or this unit does drop/swap. Quote Link to comment https://www.bigmacktrucks.com/topic/75901-air-pissing-out/#findComment-581559 Share on other sites More sharing options...
nbone28 Posted 1 hour ago Author Share Posted 1 hour ago 2 hours ago, Mark T said: This didn't happen to start after that foot valve was changed, did It ? Changed the brake valve out a little over 2 months ago, this just started happening on Monday. Quote Link to comment https://www.bigmacktrucks.com/topic/75901-air-pissing-out/#findComment-581561 Share on other sites More sharing options...
nbone28 Posted 1 hour ago Author Share Posted 1 hour ago 4 hours ago, mechohaulic said: air is constant leak out the exhaust yellow line when you push in the red button to release trailer brakes ;; correct??? do you pull same trailer or others?? same we continue ; other trailers being hooked to , does exhaust still leak,?? attempt here is to verify the truck has the issue I pull the same trailer everyday. I stay hooked to it. It isn’t leaking constantly out that yellow line, when you go to push the red button in, air leaks out of that yellow line, the air will drop to 80psi in both tanks, and then build back up. Once it builds back up it doesn’t leak again until releasing the trailer brakes. Quote Link to comment https://www.bigmacktrucks.com/topic/75901-air-pissing-out/#findComment-581562 Share on other sites More sharing options...
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