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So waiting on the rebuild kit and did some more searching. I identified the current civilian part number, and it includes the rebuild kit I mentioned prior on the description. A search using this final part number discovered a lot more of these units (NOS) out there for prices from $49 and up...

I dug a little deeper on the valve after ordering the kit. Turns out two of the three gaskets like the picture above were split. All the others looked good. I will do some more pics and a different write up and will rebuild the entire valve for future use by others with the same problem.

I found the kit, although it looks like it covers several different trailer valves. I think it will be good to have on hand as it may also have some parts from the trucks air brake valves as well. RN10JM by HALDEX - RT4 Multifunction Trailer Valve Repair Kit (finditparts.com)

Raining like crazy since yesterday, but I was out in the garage so I figured why not start to tear apart the old spring brake valve to see if I can repair it or at least see where it failed. When it was on the trailer, I determined that the leak was somewhere on the lower left side as I was...

So, the rain let up for a bit and I took the valve up to the trailer. Followed the TM for changing out the fittings on the old valve. Then disaster struck. The tee fitting on the back was in tight and as I pushed the wrench slipped and crushed one of the small Tee fittings. Spent some time...

The NOS valve showed up today and I will try and get it installed tomorrow if the weather cooperates a bit (supposed to rain for the next couple of days). I did take the old one off tonight to remove all of the brass adapters.

Just a little update......Doing more research and part shopping, I did locate a NOS valve (surprised to find it so quickly). With Xmas right around the corner, I have been too busy to take the valve off and figured at this point I will replace it with a NOS part and then see about rebuilding it...

Continuing to get my trailer up and running. Hooked it up to the truck today and fed air into the system to see if the brakes worked after replacing missing air hoses. Sucess, but there seems to be air escaping from the brake spring valve behind the tank. Is there a vent on this and should it...