How much vacuum for power brakes?

[440]

How much vacuum is required for power brakes? I found out yesterday my car has an electric vacuum pump hooked up to the brake booster but the headlights and heater box are all hooked up to manifold vacuum. I haven't pulled a manifold vacuum reading but if I can do away with the pump I will.

[histoy]

I've found that 11" was a safe minimum vacuum for the power brake booster on my cars.

[440]

Thanks for replying, I'll take a vacuum reading when I fire up the car again and see what it is.

[c00nhunterjoe]

It doesnt take much to run them, the trick is reserve. You will def need the resevoir to get more then 1 pedal pump.