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The check valves are under the cab

I think it was 2 lines that went from the cab pass thru to the 3 valves under the drivers area.

Got it finally!!! 2 air lines under the cab were switched. I compared each line one at a time to a functional truck seeing where each went to and from.

I swapped all 3 with ones from my parts truck but I wonder if they could be bad also. I have new ones on order. Will

I followed the tm troubleshooting. According to the tm my results show a good tractor valve.

The crimped vent cap on the cover piece over the front service brake gladhand?

There is a tm flowchart for low rear gladhand flow. I am leaning towards the tractor valve. Which can be rebuilt. I have a spare I would swap in and then play with the old one.

So I tried the rear gladhands and they don't work properly. With trailer and brake valve in I don't get service air in the rear when braking. There is a tm troubleshooting action for this issue. Started following the flow chart but ran out of time. I have one more air line to check Monday if air...

Swapped just about everything. The schematic makes it a bit easier to deal with. Had to find it on the net I didnt have that TM. Confusing as heck though. I couldnt find a specific flow chart for troubleshooting my issue though. Looking at the schematic I dont think the treadle valve can be my...

Out of the 3 check valves by the washer bottle, first one was ok. Middle one had a cracked diaphragm. Took one off my parts truck, verified the diaphragm was good and swapped it in the bad ones place. Still have the same problem. Tomorrow I will pull off the last one.

Are you referring to the 3 check valves that look like 3 way splitters? I will have to take them apart and see whats going on in there too.

The tms dont appear to have a complete schematic that I have found. Just alot of flowcharts for troubleshooting.

I dont think the check valve can be installed backwards its male/female. I am wondering if I have a hole in a service brake diaphragm or if air is going thru the treadle valve. Does the tractor protection valve have air supply to it if the spring brake dash control is not released?

No go on the service brake quick release valve. Swapped it out and it still leaks out the service air gladhand with brakes applied

We shall see in the morning. Weather permitting.

I have made some progress. Re-reading the TM it talks about a quick release valve. The only quick release valve that I know is part of the ctis. Which I previously tested by switching to a lower tire pressure setting. But evidently there is also a quick release valve thats part of the service...

I have a M1083 truck with a brake/air issue. Not quite my area of expertise and I could not find my specific issue in the TM troubleshooting. The brakes do function and the truck can be driven, but when I step on the brake pedal, air flows out the front blue service air gladhand at a decent...