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Brake Master Install

I am installing a PI Motorsports stock replacement brake master cyl using the original vacume booster on my 71 pre L. After making new lines and bleeding per posts on this site I have a good pedal, solid feel until I start the car then the pedal goes to the floor, and is very soft. Any thoughts? Any adjustments or measurments for the shaft from the cyl to the booster. The booster was working fine with the old original master cyl.
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