Sorry if this has been posted I know I saw it somewhere all my searches came back not found. One of the big problems with disc's on the rear is how do you get parking brakes back? there have been various ideas floating around and the problem has been addressed by different OEMS. I have a dedicated off road truck some events we go to because of insurance demand that we have a parking brake, line locks do not count. Adapting an OEM set up would be nice but my truck runs 3/4 ton running gear with a full floater rear diff. So the other day I was reading somewhere on line and saw this little Jewell.
http://www.airheart-brakes.com/cal-mb1.html