Ok, So I put rear discs on my 444. I also did a front wheel disc upgrde, via the traditional method using Volvo parts. In the rear I used 1999 Jeep Cherokee rotors. They have the same bolt pattern, and are deep so they fit nicely and set the rotor back to accommodate the calipers. I used GM Cadillac rear calipers with built in emergency brake, and mounting brackets purchased from an online hot rod shop. The master cylinder is stock and has been rebuilt, and the backpressure valve removed as per the article on "The Brickboard". It is the early style master cylinder, the large 7/8" style so it has plenty of volume. Naysayers said that I was going to have too much rear brake so I added a proportioning valve to the rear.
Everything complete, I bled her down and the pedal has been firm with about 3/4" of play for several weeks. Then I took her out on the road. she was fine and worked well, until the rear brakes just kind of got tight and stuck. Prior to this I tested 1. the brakes themselves by stomping down on them good to see how it stopped. (she stopped quickly, locking both rears evenly without pulling) and 2. the emergency brake by stopping on a hill and pulling it out hard to see if it would creep. When I released the brake I found that one of these two things had caused the rears to stick and get tight. Furthermore, the pedal is now completely protracted, tight and has no play at all. The pedal is so tight that you cannot even make it move in the least. If it was just the rear wheels locked I would assume that the calipers had rotated the pistons out when I pulled the E-brake. But with the pedal suddenly so stiff I'm not sure what the problem is. Any and all advice is greatly appreciated.