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Thinking about this last night before I went to sleep I remembered one a while ago with same problem.
To resolve which part of system was faulty, I released the m/c from the servo booster after applying the brake to the point where we had brake drag with pedal released.
As we undid the two nuts holding the m/c to the booster, the brakes ran free...this time it turned out to be the booster piston assembly.
You might try the same before spending on a m/c.
We could see in the end of the m/c and see the plunger had fully returned to the internal snap ring.
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