Joey Mack Posted yesterday at 02:59 PM Share Posted yesterday at 02:59 PM Are there QR-1 valves on the trailer? If so, see if they are failing. You should be getting a blast of air exhausting from the trailer when you set the trailer brakes. If not, then it may be back feeding through the air valves 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75901-air-pissing-out/page/5/#findComment-581821 Share on other sites More sharing options...
mechohaulic Posted yesterday at 03:00 PM Share Posted yesterday at 03:00 PM 6 minutes ago, nbone28 said: Got the new brake can installed, I’m still getting air pissing out of that yellow airline underneath the hood, this time it’s dropping to 110psi not to 80psi like it was before. Still trying to figure out what’s going on. new dash valve/ new brake can ; air consumption (not air loss-there's a difference. ) not as bad is a positive, seems the air issue is still with trailer. when red button pushed in air movement heard in systems?? did you check brake adjustment ? out of adjustment cans will use more air to completely release. air loss would be a near complete emptying of tank(s). air consumption would be using more then needed == brakes out of adjustment ... just to clarify. Quote Link to comment https://www.bigmacktrucks.com/topic/75901-air-pissing-out/page/5/#findComment-581822 Share on other sites More sharing options...
nbone28 Posted yesterday at 03:08 PM Author Share Posted yesterday at 03:08 PM 7 minutes ago, Joey Mack said: Are there QR-1 valves on the trailer? If so, see if they are failing. You should be getting a blast of air exhausting from the trailer when you set the trailer brakes. If not, then it may be back feeding through the air valves Yes i’m getting that blast of air exhausting from the trailer probably about a minute id say after setting the trailer brakes Quote Link to comment https://www.bigmacktrucks.com/topic/75901-air-pissing-out/page/5/#findComment-581823 Share on other sites More sharing options...
mechohaulic Posted yesterday at 03:09 PM Share Posted yesterday at 03:09 PM 5 minutes ago, Joey Mack said: Are there QR-1 valves on the trailer? If so, see if they are failing. You should be getting a blast of air exhausting from the trailer when you set the trailer brakes. If not, then it may be back feeding through the air valves not going back to first post; but I thought it stated air leaking out yellow line when the red button was pushed in to release brakes ?? air leak exhausting slightly less dropping from 80 to only 110. Quote Link to comment https://www.bigmacktrucks.com/topic/75901-air-pissing-out/page/5/#findComment-581824 Share on other sites More sharing options...
mechohaulic Posted yesterday at 03:11 PM Share Posted yesterday at 03:11 PM 2 minutes ago, nbone28 said: Yes i’m getting that blast of air exhausting from the trailer probably about a minute id say after setting the trailer brakes ok setting the brakes not releasing. that's not bad. check brake adjustment also. Quote Link to comment https://www.bigmacktrucks.com/topic/75901-air-pissing-out/page/5/#findComment-581825 Share on other sites More sharing options...
mechohaulic Posted yesterday at 03:13 PM Share Posted yesterday at 03:13 PM whole purpose of the yellow exhaust line is just that;; exhaust the system air when red button pulled out. Quote Link to comment https://www.bigmacktrucks.com/topic/75901-air-pissing-out/page/5/#findComment-581826 Share on other sites More sharing options...
nbone28 Posted yesterday at 03:18 PM Author Share Posted yesterday at 03:18 PM 4 minutes ago, mechohaulic said: whole purpose of the yellow exhaust line is just that;; exhaust the system air when red button pulled out. so that line is supposed to be blowing air out it when i pull the red button out? Quote Link to comment https://www.bigmacktrucks.com/topic/75901-air-pissing-out/page/5/#findComment-581827 Share on other sites More sharing options...
mechohaulic Posted yesterday at 03:19 PM Share Posted yesterday at 03:19 PM went back to page one. first sentence ;" when I PUSH IN THE RED BUTTON" , yellow line leaks. basically I'd say the module was the problem . you just happened to find a brake can leaking on SERVICE side . slight air exhaust when PULLING OUT the red button not bad. Quote Link to comment https://www.bigmacktrucks.com/topic/75901-air-pissing-out/page/5/#findComment-581828 Share on other sites More sharing options...
mechohaulic Posted yesterday at 03:22 PM Share Posted yesterday at 03:22 PM 1 minute ago, nbone28 said: so that line is supposed to be blowing air out it when i pull the red button out? slight exhausting ; not major blowing. also when pulling out the red button should NOT effect air gauges . pushing in to release brakes there could be air loss in tanks/ on gauges . NOT setting brakes. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75901-air-pissing-out/page/5/#findComment-581829 Share on other sites More sharing options...
nbone28 Posted yesterday at 03:26 PM Author Share Posted yesterday at 03:26 PM (edited) 10 minutes ago, mechohaulic said: went back to page one. first sentence ;" when I PUSH IN THE RED BUTTON" , yellow line leaks. basically I'd say the module was the problem . you just happened to find a brake can leaking on SERVICE side . slight air exhaust when PULLING OUT the red button not bad. Yes that was the initial problem. I did not know that that air exhaust pushing out air when you pull the red button out is not bad. So with tanks full at 130psi (when the air dryer blows) I push in the trailer air supply button and it drops to 90 psi and then will build back up. (no air is coming out of that air exhaust line) With tanks full again, I pull the button out and the air pressure slightly drops, but there is air coming out of that yellow air exhaust line. About 1-1.5 mins after pulling the button out i get that air exhausting from the trailer twice, first one and then probably 30 secs after a second woosh of air. Edited yesterday at 03:29 PM by nbone28 Quote Link to comment https://www.bigmacktrucks.com/topic/75901-air-pissing-out/page/5/#findComment-581830 Share on other sites More sharing options...
mechohaulic Posted yesterday at 03:29 PM Share Posted yesterday at 03:29 PM does this trailer have air ride suspension ??? ==1st blast of air brakes setting/ second blast of air is suspension dropping. Quote Link to comment https://www.bigmacktrucks.com/topic/75901-air-pissing-out/page/5/#findComment-581831 Share on other sites More sharing options...
mechohaulic Posted yesterday at 03:32 PM Share Posted yesterday at 03:32 PM air suspension will also account for air dropping. if it is spring suspension I might have to consult with Yukon Jack at this point. Quote Link to comment https://www.bigmacktrucks.com/topic/75901-air-pissing-out/page/5/#findComment-581832 Share on other sites More sharing options...
nbone28 Posted yesterday at 03:34 PM Author Share Posted yesterday at 03:34 PM 4 minutes ago, mechohaulic said: does this trailer have air ride suspension ??? ==1st blast of air brakes setting/ second blast of air is suspension dropping. Yes trailer has air suspension 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75901-air-pissing-out/page/5/#findComment-581833 Share on other sites More sharing options...
nbone28 Posted yesterday at 03:35 PM Author Share Posted yesterday at 03:35 PM I also just went and adjusted all the brakes on the trailer just to be certain 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75901-air-pissing-out/page/5/#findComment-581834 Share on other sites More sharing options...
mechohaulic Posted yesterday at 03:36 PM Share Posted yesterday at 03:36 PM 1 minute ago, nbone28 said: Yes trailer has air suspension problem solved 😀.. cann I get an AMEN !!!! Quote Link to comment https://www.bigmacktrucks.com/topic/75901-air-pissing-out/page/5/#findComment-581835 Share on other sites More sharing options...
mechohaulic Posted yesterday at 03:37 PM Share Posted yesterday at 03:37 PM 1 minute ago, nbone28 said: I also just went and adjusted all the brakes on the trailer just to be certain were they out of adjustment ???? Quote Link to comment https://www.bigmacktrucks.com/topic/75901-air-pissing-out/page/5/#findComment-581836 Share on other sites More sharing options...
nbone28 Posted yesterday at 03:38 PM Author Share Posted yesterday at 03:38 PM Just now, mechohaulic said: problem solved 😀.. cann I get an AMEN !!!! So we’re good then? That air coming out of the air exhaust line is fine? When I pull the red button the air pressure is staying at 120psi, no initial drop in psi. Dropping to 90psi when I go to push the button in, but no air is coming out of that air exhaust line. 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75901-air-pissing-out/page/5/#findComment-581837 Share on other sites More sharing options...
nbone28 Posted yesterday at 03:39 PM Author Share Posted yesterday at 03:39 PM 1 minute ago, mechohaulic said: were they out of adjustment ???? no they were all set properly 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75901-air-pissing-out/page/5/#findComment-581838 Share on other sites More sharing options...
mechohaulic Posted yesterday at 03:43 PM Share Posted yesterday at 03:43 PM 3 minutes ago, nbone28 said: So we’re good then? That air coming out of the air exhaust line is fine? When I pull the red button the air pressure is staying at 120psi, no initial drop in psi. Dropping to 90psi when I go to push the button in, but no air is coming out of that air exhaust line. now knowing trailer has air suspension; this is what's called normal operation. have a good day. Quote Link to comment https://www.bigmacktrucks.com/topic/75901-air-pissing-out/page/5/#findComment-581839 Share on other sites More sharing options...
nbone28 Posted yesterday at 03:46 PM Author Share Posted yesterday at 03:46 PM 1 minute ago, mechohaulic said: now knowing trailer has air suspension; this is what's called normal operation. have a good day. Thanks for all the information and help, it’s been a bit confusing on my end with initial information but I appreciate sticking around and helping me out with this. Thanks again 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75901-air-pissing-out/page/5/#findComment-581840 Share on other sites More sharing options...
Geoff Weeks Posted yesterday at 04:16 PM Share Posted yesterday at 04:16 PM (edited) 50 minutes ago, nbone28 said: YAbout 1-1.5 mins after pulling the button out i get that air exhausting from the trailer twice, first one and then probably 30 secs after a second woosh of air. This bothers me, it should not take 1-1.5 minutes for the trailer brakes to set. I would be OK if it was 1-1.5 seconds. When the red button is pulled out, what should happen is the air in the line to the Tractor Protection valve back on the frame, should exhaust out the MV-3 exhaust port (in this case the yellow line). The TP should immediately slam shut, closing off both the supply and service lines from the tractor and venting the supply line from the TP all the way to the trailers spring brake valve on the trailer. The spring brake valve should do many things at this point, It should prevent the air from the air tank from escaping back up the supply line, it should detect the lack of air coming from the tractor on the supply line and immediately exhaust the air going to the spring brakes, applying the spring brakes almost at the same time as it lost supply. On newer air ride trailers a valve is used in the air suspension line to close off the supply from the level valve and open the lines to the air bags to drop the trailer down on the stops when the spring brakes apply, so it doesn't rise and fall when being loaded/unloaded. It prevents "dock creep". If yours is taking a minute to react, you have more problems on the trailer. Edited yesterday at 04:17 PM by Geoff Weeks Quote Link to comment https://www.bigmacktrucks.com/topic/75901-air-pissing-out/page/5/#findComment-581841 Share on other sites More sharing options...
Joey Mack Posted yesterday at 04:21 PM Share Posted yesterday at 04:21 PM I too was thinking 1 minute is way too long. A few seconds is more like it. The air should blast out immediately. Seems like he got it fixed.. 👍 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75901-air-pissing-out/page/5/#findComment-581842 Share on other sites More sharing options...
Geoff Weeks Posted yesterday at 04:30 PM Share Posted yesterday at 04:30 PM I've had SR-4's fail and never set the spring brakes. A restriction in the system could cause a delay. I want clarification on the time frame before for calling just a typo. He states seconds a sentence later when talking about the two ventings, which is correct the "dump" valve doesn't trip until the pressure is way down in the spring brake line. That may take a second or two after the Spring Brake valve functions. Quote Link to comment https://www.bigmacktrucks.com/topic/75901-air-pissing-out/page/5/#findComment-581843 Share on other sites More sharing options...
nbone28 Posted yesterday at 04:57 PM Author Share Posted yesterday at 04:57 PM 25 minutes ago, Geoff Weeks said: I've had SR-4's fail and never set the spring brakes. A restriction in the system could cause a delay. I want clarification on the time frame before for calling just a typo. He states seconds a sentence later when talking about the two ventings, which is correct the "dump" valve doesn't trip until the pressure is way down in the spring brake line. That may take a second or two after the Spring Brake valve functions. I just timed it, it was 43 seconds from initial pull on the trailer brake to the first venting from the trailer and then 26 secs to the second venting after the first venting. Quote Link to comment https://www.bigmacktrucks.com/topic/75901-air-pissing-out/page/5/#findComment-581845 Share on other sites More sharing options...
Geoff Weeks Posted yesterday at 05:03 PM Share Posted yesterday at 05:03 PM Way too long. There is a re-call out on the Bendix SR-5's mfg between Jan 2014 and March 2016. No idea if it applies to your trailer, or if that is even the problem. You have more work to do, but I strongly recommend a good shop that knows what they are doing and what to look for, Quote Link to comment https://www.bigmacktrucks.com/topic/75901-air-pissing-out/page/5/#findComment-581846 Share on other sites More sharing options...
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