No rear brakes after 4 wheel disc swap?

Justin Angle said
Ok how do you tell if its shuttled over? And I'm assuming the prop valve is whats down low below the master cylinder? Thought that was just a distribution block and I didn't have a prop valve. But ill check it out tomorrow. Thanks

If it was originally a drum/drum car it should just have a distribution block unless someone installed a combination valve later.

Distribution block should look like this

Combination valve should look like this