Bikereurope,
do'nt think the compresor will do the job of removal now that the other piston is out, unless of course each piston on the caliper are completley independent of each other. You could replace the first piston part way back in and clamp it so that the other piston would expand out as you apply the brakes. I suppose one could do this with the compressed air, but might I recommend placeing a bit of thin wood across the other side of the caliper as air from the compresor will shoot it (piston) out like a cannon ball. so take care.
Clean all the parts with wire wool and make sure they are very clean before reasembly.
Good luck
Socks
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