have you pressure bled ? I've seen similar problems and fix was bleeding
master cyl and even had to chase it to the equalizer valve. In the old days
we pulled the lines off the m/cand just covered the oulet with a thumb
while some body pumped em. Yea it let air back in to the lines but got it
out of the m/c. Cracking the eq lines loose worked in all but one case, but
pulling the and bleeding did it.
Of course good and new are two different things so you could have bad
Sorry if it sounds a little auto101, but I've seen it a few times and was
air all but one case and that was wrong or defective (wish I could remember
which for ya) booster.
Good luck --old goat
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