My dad has an 86 C10, 350/350 turbo w/ power brakes that have the front brakes locked. He had changed one caliper and bled the brakes on all four when both front brakes locked. By the time he asked me about it , he had already tried to remove the prop valve.
He's seventy five years old and has given up on trying to remove it alltogether because its such a pain to work on. I told him to button it back up, re-bleed all and see if the brake idiot light is on. If it is, the prop valve needs to re-center itself. I told him to do this by applying heavy pedal pressure then release. If the light goes out, the front brakes will release. If not the valve a need a little persuasion (ie: hammer time).
Am I on the right track here?