I replaced the rear pads on my ST1300 yesterday morning. The pads were worn down to paper-thin. I knew that I should have replaced them a month or two ago when I replaced the front pads, since the rear pads always seem to wear out before the fronts on every bike that I've ever owned, however I didn't replace them all at the same time this time around. I checked everything out after replacement, and everything appears to function properly, including the SMC. Brakes work well. no drag, etc. Yes, I did clean the caliper pistons before reassembling with the new pads. One thing that I neglected to do, maybe because of my CRS problem, was to clean the rotor with brake parts cleaner and/or fine sandpaper. A friend suggested that I use some 200 grit wet or dry sandpaper on the rotor to remove any glaze that might be there. I've seen this suggestion before, but don't recall that I've ever done it. I probably have some recommended sandpaper somewhere out in my man cave, but am wondering if an Scotch-Brite pad followed up with some brake parts cleaner would work just as well. I know where the latter two items are in the cave.