I'm rebuilding three year old "Elixer 4" calipers. Really a specialized-specific juicy 3 caliper. All of the pistons were quite sticky. Only one came out with the air compressor. None are reusable after I got through with them.
One piston was especially stuck and couldn't be pryed (carefully) out, aired out, or anything else.
I finally removed it from the caliper half by grinding the center pyramid (for locating the pad) to a dish shape. I then drilled and used a 6-32 tap to tap the hole in the piston. After screwing in a 6-32 machine screw, I used pliers on the screw to gently rock the piston until it came loose. What a chore! It would have been better to do some periodic cleaning and lubing of the pistons ahead of time.
The piston was a hard thermoplastic like bakelite. This method worked well when no other method would get the piston out.
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Thread: Really sticky piston!
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