But Mad North-Northwest
Join Date: Sep 2003
Location: SF Bay Area, CA
No, his input is right. If your mechanic thinks that the boosters can cause this problem by "sucking in fluid" he really doesn't know how brakes work.
The boosters may be bad, but even if they fail they won't cause your pedal to go to the floor. And if there's fluid in the boosters, root cause is a failed MC seal, not the boosters.
Unless you misunderstood what your mechanic said, I would suggest finding someone who has more of a clue.
1963 Giulia Spider (1750 engine)
Former: 1987 Milano Gold