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Re: 7" vs. 9" vacuum booster for brakes...which is better?
A 9inch booster is better. Its simple physics, the 9 inch has more sq in for the vacuum to act upon the the 7 inch. This helps apply more force with less pedal pressure. You have the room you can go to a bigger booster if their available.
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The more I learn, the more I find out I don't know.
69 Chevy SWB w/67 front end
4 wheel discs
468 BB 700R4
Bagged
Coming around slowly
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