View Full Version : power brake booster vacuum requirements?

02-05-2008, 07:42 PM
I was wondering how much vacuum is needed to safely operate the power booster that comes with the spirit 27T frame kit? Right now I get about 10 hgs while in drive and the pedal defiantly softens up a lot, but was just curious if more is needed to be safe


capt thundarr
02-05-2008, 09:15 PM
Paulski, 10 hgs should be plenty, I "assume" you mean 10" hg. most engines with a stock cam and good tune up generatearound 12 to 15" vacuum.