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Your reply:	The pedal on my '71 T-top goes to the floor on the 1st push; with about 3 pumps the pedal pressure comes up, but is still not firm. Its a manual system. I've had the master cylinder replaced 3 times (1 original change and 2 warranty replacements). Each time after replacing the MC, I lost the pedal after almost exactly 3 driving miles and had to pump the pedal to stop. The garage that replaced the MCs, subsequently recommended replacing the proportional valve. Had that done, but the pedal still went to the floor after about 3 miles. The garage claims they don't know what else to do,i.e., there is nothing else they want to do. I can't claim to be much of a mechanic and am at a loss to troubleshoot it further. The car really isn't drivable now. Anyone have a recommendation?

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