Hi folks. Went to change my pads yesterday and found that the inboard piston won't retract all the way. It moves in and out fine as long as there's more than about 5mm showing but once it gets that far in it just stops and won't go in any further. The outboard piston goes all the way in until it's flush with the caliper.
As it happens, the piston has a small chip out of the front (pad) surface and I managed to make that worse yesterday whilst faffing about, so I need to replace the piston now. Even so, I'd like to know what's preventing it going back in any more that it does. I could understand if it had gone back in at an angle and got stuck, but the fact that it goes in and out smoothly to a point and not beyond is what's puzzling me.
Tried pushing the piston out completely but full movement of the lever/master cylinder piston doesn't quite push it far enough (with outboard piston held flush).
Two new pistons = a tenner, plus the cap removal tool, plus piston seals, postage - starting to look like about £30 plus a whole load of hassle Anyone got a working Mono Mini caliper they want to sell me?