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I threaded the exhaust port and saved $150. The brakes are working great now. Thanks for your help Wes.

That figures...This one is about 4 times as much. Seems like every project I have always needs special expensive parts.

I don’t have a picture right now but the new one is exactly the same except the bottom exhaust port is not threaded. The tee where the two bottom hoses connect will not be able to be attached to the new one.

The new Q2 valve is not threaded on the bottom down facing port like my old one. Is there a different way to connect this or did I just get the wrong part?

I’ve traced the leak back to the QR valve in the front of the truck. Is there a way to clean/rebuild that or is it best to just replace it?

Are there any gauges that work better than others for these tests. I’d prefer to buy the correct one the first time verses wasting money on the wrong tools for the job?

I just bought a 1984 M923 that runs and drives great but I have an substantial air leak when the brakes are pressed. The air is escaping into the intake. I have read the TMs and hope to start pressure testing it in order this weekend. My question is what kind of pressure gauge would work...