With caliper removed.....
use a correctly sized wooden block to stabilize (hold) the piston that is moving.....leaving the stuck piston unobstructed...then introducing powerful compressed air into the orifice where the brake line attaches...it'll pop....most violently so.
I use an old towel wrapped up over the caliper, just leaving the brake line inlet..thread visually exposed to work with.
A large, wide rubber type blow gun tip will create a "seal" at the caliper inlet.... eliminating air leakage and maximizing the force of PSI the compressor delivers.
Maybe best left to more seasoned pro's...exercise *extreme care* if using this method! It WILL hurt you without some forethought as to prevention of injury.
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