Thanks for the help on the previous post. and I just spent the last hour searching old posts for an answer. so, I just put the rear disc on the 14 bolt. Got the parking brake all hooked up to the eldorado calipers. First question, do you need the eldorado pads, cause I used front pads for my truck, and I think this is part of my problem. Second, my pedal is low, which I imagine is air, or parking brake out of adjustment, but the problem is, when I pull the lever on the caliper, you can see the piston go out, then it starts to spin. It only applies a slight amount of pressure, then the piston and the bracket all spin, so it doesn't hold the truck. Now I know this can't be right. So, how do these calipers work? and could the pads be part of the problem. anyway, thaks for the help, I'm going to bed, and hopefully I will have some insight into this in the morning.