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Fittings come put pretty easy. I swap relay valves all the time

Nope. They just have paint on them. Lock the valve in a vice and take em out they may snap off. If you cant get em out you may have to carry it to a hydraulic shop have them match up new fittings. Remembe4 to use teflon tape

The top valve is an anti compounding type relay valve part number N50024B Bottom one is a standard KN28080 for new or KN28080X for a reman That valve is not listed in the TM

Also take a pic of a more general location on the truck. I see another relay valve in the background behind it. Relay valves are usually on each axle set

Your old one should have a tag on it. If it does not then post a pic of the valve and how many ports say Del, serv, sup. It is an R12 valve more than likely i doubt its an R8 . They can have a few various forms of look but serve the same purpose

They are just JIC on the big hoses they will just swivel right off. The 2 or 3 dot fittings should come right off as well.

Haldex # N50004D or E. Just google or ebay search. Really any R12 valve would work but you may have to have bushings to adapt to the port size fittings you currently have

It's got a rubber diaphragm that went out. The rubber is probably 10yrs old if not older. It just gave out and and started venting. Better than it going out and applying air to the brakes locking them up and not venting. This happens alot on trucks primarily used offroad. Junk can get under...

Relay valve Common commercial part. Just replace it.