Thread: Brake boosters

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Is there a formula to figure out how much assist you will get from a given size booster at a given amount of vacuum?

Lots of brake tech help here.........www.mpbrakes.com

Thanks for the link. I've looked at that and several other sites and they don't answer the question I have. I'm looking for a way to quantify the difference between two boosters in the same system without buying and installing them.
For instance, as an example, an 8" single diaphragm booster with 17" of vacuum requires 75lbs pedal input to create 1000psi at the front caliper. How much pedal input would it take for an 8" dual Diaphragm booster to reach the same 1000psi with the same amount of vacuum?

You might phone MPBrakes. They can probably answer your concerns.

After a lot of searching I found this...

"This is the formula to figure your output booster pressure.
Force in pounds = (Diaphragm area in square inches) x (manifold vacuum in inches Hg) x ½
Example: 7” single diaphragm booster with 17 inches of vacuum. 3.5” x 3.5” x 3.14 = 38.465 square inches x 17 inches of vacuum x 50% = 326.95 psi"


Not sure how accurate this is, any thoughts?
It doesn't directly answer my question, but it does give a direct means of comparison.