Ok, my rear brakes have never worked very well sence I have had the truck. They dont have much stopping power. Front worked great, I had to replace the front pads and after that the brakes dont work as well as before I replaced them. After that I have replaced the master cilinder, distribution block 2x, all the springs, adjusters and shoes in the rear and blead the hell outa them. Now they work even worse. The more work I do on them they seem to get worse. What should I do. Im going to order up a set of braded brake lines next sence they do need replaced also. Its an 87 k5 by the way. Could it be my booster sence that is about all I havent replaced?