forced 340
Well-Known Member
anyone know the answer to this question? i need to know the minimum amount of engine vacuum need to run the booster correctly and safely. thanks guys!!
minimum vacuum for power brakes
- Thread starter forced 340
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I like to have 14 InHG vacuum at idle. If the car has a manual transmission you can get away with a little lower.
forced 340
Well-Known Member
is that reading in gear? or do you have a manual?
MRL Performance
Well-Known Member
My customers report to me that 9" is bare minimum, and 12" works great without issues.
1968FormulaS340
Well-Known Member
Or the better option. Non-power discs.
I have a manual, so that is in neutral. When I lift and brake at speed, I see up to 24 InHG. I use to get that with the smaller cam, even though it idled at 19 InHG, so braking is the same at speed.
forced 340
Well-Known Member
right. the car has factory power brakes and i am trying to just get the car running and driving with what i have. i am put it together with spare parts i have.
forced 340
Well-Known Member
thanks guys! looks like i have about 12inHG in drive. seems to work great!
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