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Rebuilding rear master cylinder problems

AcMedic

CB750 Member
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Location
Galloway, New Jersey
Need some assistance. 79 750F Super Sport. Has sat in dry storage since 1988. I'm rebuilding the wheel and master cylinders. The piston is STUCK in the rear master cylinder. I've taken everything apart but that. I was able to tap it to move it in the bore, hit the intake with air from my compressor to attempt to blow it out. Nope! Stuck! Currently it's sitting with brake cleaner fluid soaking, hopefully that will help. Any tricks or tips I'm missing? I've got tons of experience rebuilding brakes, both bikes and cars, but this one has me coming up short. Thanks in advance.
 
Cobble up a fitting to fit the passage and to a handheld grease gun, That will move it at several thousand psi. How I remove the bad ones.
 
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