I have a '95 F-350 crew cab, it is a 4wd. My problem is my brakes. Since I put the new master cylinder on, my calipers lock up. The only way I can get them to release is to crack open the line a pry them apart. When I followed the lines to see wherre the block for the flow back was I keep getting all the way back to the master cylinder. I thought maybe somehow the adjusting nut in the booster crept itself out. So I turned it in a little but that did not help. Anybody have any ideas on what the problem could be?

 

sounds like the check valve in the master cylinder is either backwards or broke