blade08gt

ok i just purhased a 1989 gt. i got the ccar with a few bugs of ccourse. well it didn't have brakes when i got it (vacuum leak on power booster no big deal) i have brakes but the issue is that when i hit the brakes i ccan hear vauum coming from the brake plunger inside the car. now it has a cam in it(not sure how big it is but it hits a lick) so is it possible that the extra vacuum from the cam is bleeding through the brake booster or am i just a retard
thanks for the help in advance