nbone28

UPDATE: Replaced the maxi valve, no more air pissing out of that yellow air exhaust line underneath the hood when you go to push in the trailer air supply. Replaced the spring brake valve on the trailer, brakes are applied within milliseconds of pulling the red button out. No air pissing out of that yellow air exhaust line when pulling the red button out either. PSI holding at 120 when you go to pull the button to set the brakes and not dropping to 80psi like before. Thank you all for the helpful information throughout this process. It is much appreciated. Thank you.

With the hole in the web & that it wasn’t rising to system pressure. the flow out of the red & blue lines were good.

Bought new spring brake valve from results of the test. Should be here Tuesday. Let’s hope this solves my issue.

I will give this a test, thank you

Are there signs to look for that would indicate that spring brake valve to be going bad? How would I go about determining the lines have “crap” in them?

Where’s the SR-5 located at on the trailer?

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.

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

no they were all set properly

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.

I also just went and adjusted all the brakes on the trailer just to be certain

Yes trailer has air suspension

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.

so that line is supposed to be blowing air out it when i pull the red button out?