[blykins]

Like I said before, I think the amount of pressure you get varies upon how far the diaphragm is pushed. I think of it just like a piston/cylinder relationship. The further you push it, the further the diaphragm moves, and the more you compress the air inside. Even though the cylinder is not totally sealed like in an engine, I think you would still get a great amount of pressure created by compressing the air...thus moving the linkage to the master cylinder.

Therefore if you had that empirical number on how much you actually compress the air at full pedal depression, you could calculate how much force the air is placing upon the master cylinder.

Does this make sense, or am I passing 3rd base headed for the outfield?