No rear brakes after 4 wheel disc swap?

Justin Angle said

The piston for the calipers are all the way pressed and haven't moved since I have messed with them. I don't think I'm following you on the valve in the master cylinder if it was the master cylinder your referring to. I pulled the line off the front outlet and I don't see anything removable.

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He’s talking about the residual pressure valve I mentioned earlier. Drum master cylinders typically have a residual valve, so after you step on the brakes the valve holds a little bit of pressure in the lines to “stage” the brake shoes so the brake application is faster. If it was there it wouldn’t keep the brakes from applying, although it might cause the calipers to drag. Since that doesn’t seem to be the immediate problem we can worry about that later, the brakes have to work first.

Tell me about this 8.8. Where did you get it? Have you rebuilt the brakes and calipers? Or did it go straight from the junkyard to your car?

And is the frame to axle brake hose new?