Just a note to close this thread... ST is back on the road, finally! My KLR, which is only 7 years old, once again has electrical issues, so I finally got myself to finish the ST. The issue was I could not get the pistons out, as compressed air was not doing it, so hooked the calipers back up again and pumped them out, after leaving one of the brake pads out so they would come out further. The rest was easy, new seals in left caliper and simply cleaned up the right caliper with brake cleaner and fine steel wool on the pistons. I still had one piston that I could not get out, so used one from my extra caliper, as of course they fit. Per Jim Van's advice (thank you!!!) I used dielectric grease on the pistons and bores and they slid right in nicely. And the best part it, it stops perfectly again AND the things finally retract! Also rebuilt master cylinder, so I should be good there for some time, although I may put new seals in left side eventually. Now on to the rear caliper, as that has been slowly getting spongier, but I am at least able to get a few weeks of riding in here before the nasty stuff starts. Thanks again for the advice!