rear disc brakes not working

[bowtieman55]

I swapped in a Dana 44A with disc brakes into my previously drum brake equipped '93 Grand Cherokee. I didn't swap out the master cylinder or proportioning valve. The rear brakes aren't engaging. I've not yet checked for brake fluid flow at the hard to rubber line, and I also didn't change out the center rubber brake hose, calipers, or anything else. I know I need to check for flow at the steel/rubber connection, but before I tackle ANYTHING, I wanted to ask if the disc/drum master cylinder/proportioning valve combo might be the culpit?

 

[GubNi]

I don't think your mc or valve is the problem. Just bleed the brakes some more and check your flow.

 

[chupacabrah]

caliper could be seized?