If you are dragging a piston, it might be a good idea to pull the pads with the caliper still on the car and press the brake pedal a little and use the hydraulic force to break the piston loose. I've seen them so seized that 100psi of air wouldn't free them. I don't like using that much air pressure anyway, because when the piston decides to finally break loose, 100psi is going to send it flying.
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Chris M
1985 911 Carrera with a couple cosmetic only mods
2006 E90 330i
1999 E46 328i
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