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Just thought I'd pass on my morning's learnings.
I have a seized piston in my Juicys and have bought a new pair. I dutifully watched the YouTube tutorial on forcing out old pistons with a track pump and airbed attachment. I might have been doing something wrong, but no amount of pumping would get mine out. So here's my method:
Carefully drill 2 x 4.5mm diameter holes in the recess at opposite sides of the piston. (be super careful because there's no much clearance between the back of the piston and the metal caliper body).
Get a pair of medium, pliers, stick in the holes you've just drilled, twist and pull. Easy peasy.
Carefully clean all resin dust and swarf out before reassembling with new seals and pistons. I used red rubber grease on pistons and seals during reassembly to try to stop them from seizing again. Even with this, I had to use a small G clamp to get the pistons past the new seals.
As I said, there should be an easier way but this is an alternative that worked for me.
Note for anyone attempting the trackpump method:
If they are indeed stuck, then when they release it will be with a hell of a bang, and the piston will do a passable impression of a bullet.
Best done with the caliper inside a cloth bag or similar!
Ill echo stevo i may have fired a hole in the plasterboard roof of the workshop with some early hopes at a shop i was working in.
I [b]was [/b]fully prepared for explosive piston action as well - alas no! Had to get the power tools out!