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Wes, thank you for your efforts and time helping me understand this dam air brake systems. I greatly appreciated all your knowledge. I did not look at the vent on the front passengers side glad had, it was plugged up. 98G in the beginning had mentioned it. Thank you! That fixed the problem . I...

Ok thank you for all the information. I will do some more troubleshooting. I will let you know what I find.

No I don’t

Yes, I replaced that check valve and the one just aft of that one, on the frame also .

Yes I already replaced it with a Haldex KN25060. Could it be I need to reverse the check valve

Sorry for the confusion. No constant air to the relay valve. There is air when I Push the brake pedal. Can’t figure out why my service brakes will stay on when I let off the pedal. When I remove the red air line from the double check valve on the driver side frame where the stop light pressure...

I removed the line off the aft ABS relay valve. There is not constant air. I pushed the brake pedal a few times see if the valve was sticking. There is no air when the pedal is not depressed

Well I replaced the treadle valve since I had one and still didn’t work. My service brakes have constant pressure. Could some air line be connected wrong?

I will try that this weekend, let you know if that was it

My spring tank has air and pressure. 1st time you step on the brake pedal the brakes lock and won’t release. I took the line off the small pod and it has constant pressure. So it keeps my brakes on after the pedal is released

Can you pm me when you get a chance. Snowride800@hotmail.com

I replaced both of those check valves, the tank has 110 pressure with a gauge connected to it. when I step on my brake pedal air flows to my service brake chambers, and keeps flowing after I take my foot off the pedal? Any thoughts?

My gauge reads 120, but I will rig a gauge to check that pressure tank.

Can anyone send me some pics of the valves and plumbing that are located on the drivers side step. My brakes won't release. Changed all the check valves and spring brake pods. Wedges are greased and look great.