[blykins]

Yep, your conversion is correct. And your math is correct....

However, I don't think it would be a linear pressure application. The way the diaphragm is made, I think it would be almost a natural log function....or half a parabola. Basically what you described up above would be like the surface of a piston in a cylinder. I think this thing has more of a tapered design...right? The harder you push, the more power you're gonna get. You're essentially creating more and more pressure...but not in a linear fashion.

The power booster just multiplies the force you place on the master cylinder, right? That's why you would need it in a tandem situation...because it takes more force to compress a single brake master cylinder which is servicing 4 wheels worth of brakes. But I do think the rate at which it does so is not linear...unless the diaphragm and housing are perfectly cylindrical.