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Sounds like a bad Master cylinder. I used to have a set of plugs just for times like this. Plug the M/C, eliminating the rest of the system, and check for a pedal, if you have a consistent pedal, it's further down the line. No pedal, or soft, it's the M/C. Sometimes quality control isn't what it's cracked up to be.
What was the original problem before you changed the M/C ?
Is the booster O.K.? I've seen them fail, and apply vacuum to the rear seal on a M/C causing it to fail also. The sysmptoms are pretty close to what you describe. If your lucky, it will leave a trail down the front of the booster.
If it isn't that, I got nuthin".
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