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Yes. One outlet connects to the double check valve. The other outlet connects to the air stack and allows for the venting of air, though the stack, when you engage the parking brake.

It was in fact the quick release valve causing all the problems. In retrospect the first clue should have been the lack of air escaping through the air stack (farting) when I engaged the parking brake. The more I work on my M932 the more I like my M813..... Air Brake QR-1 Quick Release Valve...

So I removed the vent line on the control directional linear valve, on top of the parking brake lever. According to the TM once the parking brake lever is released air should come out of this vent line. As no air is coming out of the vent line the TM says to replace the quick release valve. I...

It'll leak down in a few minutes, if I leave the parking brake down. With the parking brake engaged it'll hold air overnight or longer.

No luck with the brake pedal trick plus I replaced the treadle valve and pedal with a unit from a working truck. I checked for air coming from the brake chamber vent lines, with the spring brake release control valve in, and the was none. The air was still leaking into the stack though.

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So I unhooked all the vent lines, from the four rear spring brake chambers and no air was leaking from any of the fittings. In the attached picture the bottom line is the supply and the others are vent lines, best I can tell from the TM pictures. I think that removes them as the causes of the...

Gotcha. Nothing in the -23 TM about that, guess I'll have to do a little more research.

I checked all the Service Brake Chamber's vent lines and there was no air leaking at any of them so their out as a cause.

So I'm getting air leaking into the air intake stack but it's when the parking brake is released, not when the parking brake is applied (as indicated in the TM). This is causing the primary and secondary air systems to bleed down. When I activate the parking brake the leaking stops and air...