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Screw a grease fitting in place of the bleed screw, pump the caliper full of grease.Use a small C-clamp to hold the non-stuck piston in place.
Sometimes the steel piston is so corroded that no measure of pressure, compressed air or grease will budge it. As a last resort I weld the tip of an old bolt to the centre of piston and let it cool. Attaching a wrench to the bolt head I then turn the bolt / piston out, works every time.
If a steel piston is that far gone, isn't the caliper's aluminum also toast?
I had an issue with a Kawasaki last year and made this video, may helphttps://youtu.be/1GAg5IHcCBoGino
Thanks Gino. I’ve heard about that but never seen it done.I used a small c clamp and a bit of inner tube to block the inner port, wrapped a towel around it like Charlie suggested, and a little compressed air popped it out.