[blueridgerunner]

Get the proper size Zerk (grease) fitting from auto parts place, screw into hole where bleed screw goes. Use a lever type grease gun. It develops many times the pressure of air (air compresses, grease will not). Block the other piston as stated. Stuck one WILL ooze out, not shoot out forcefully as with air. It will come out, I promise. Wipe out with paper towel or rag, clean with brake cleaner.