Once again I'd like to thank the memebers for all there help. I just got done going thru a few weeks of brake repair that started out with the front discs locking up. This lead into flushing of the lines and replacement of the master, booster and wheel cyclinders and brake lines. I believe that the brake lock up was do to crude in the brake fluid and the residual valve not relieving the pressure. After replacing all the components mentioned, I tried for a couple weeks to get a hard pedal with no luck. After isolating one item at a time it ended up being the rear wheel cylinders. The wheel cyclinders I purchased were the economy models from CCOT since I plan on restoring the truck in the future. After weeks of bleeding and adjusting brake shoes, the culprit was air that was trapped in the rear cylinders. This air trapped in the rear cylinder gave you a pedal that would pump up. I myself thought that air would make the pedal soft all the time and not pump up, but not so. Awhile back Mud member hamm made me aware of a problem with CCOT cylinders and bleeding the air out of them. The method that we used was to remove the caps off the rear cyclinders and push down the piston with a large c clamp vise grip to bleed the air out the tapped holes that are located below the high point of the wheel cylinder. This was done while pressure bleeding and bleeding thru the bleeder screws. This method did not work. It wasn't till member 65swb45 offered the method of disassembling the cylinder, removing the rubber seal and inserting it into the cylinder in the vertical position and then rotating it horizontal while being submerged in the fluid. While performing this you must have the drum on the opposite side of the truck and a clamp on the other wheel cylinder that you are trying to bleed. This is for you don't push the piston out of the other wheel cylinder as your working on the current one. While assembling the cap you want to be bleeding thru the bleeder screw to displace the fluid while inserting the cap into the cylinder. The CCOT cylinders are definetly different from the stock ones that were removed off the truck , The stock ones have a metal cap that has the seal on top of it as the ccot basically has a spring with just a rubber seal that causes a larger area to catch air. The absence of this cap may be the reason why the CCOT cylinders were such a pita to bleed. If it wasn't for 65swb45 and my mechanic's thrive to not let the drum brakes get the better of him, I don't think this problem would have been solved. Some may say that normal bleeding should have taken care of this problem, but not so. This system was pump blead, vacuum blead and pressure blead several times. I hope this may help others with the same ongoing problem.
Thanks again Dave
Thanks again Dave