Stock setups usually have a BIG tube going to the vacuum booster. If your line is too small, it may not be able to recharge the booster quick enough due to friction losses in the small line.
Kevin 1951 Chevy 3100 work truck Follow this saga in Project Journal Photos 1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car) Busting rust since the mid-60's If you're smart enough to take it apart, you darn well better be smart enough to put it back together.
