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## Main Question or Discussion Point

**Car brake-pedal force....**

Hey all,

im posting because i would like suggestions (preferably with proof) on how a relationship between initial velocity of a car, force to brake pedal and desired braking distance can be formulated. Assuming we know the velocity and the desired braking distance from this initial velocity?

so far i have the equations for forces going through the brake system but only once a foot force is generated.

for example,

biasForce = footforce*Ag

where Ag = mechanical advantage of pedal (found by taking moments about the pedal axis)

biasForce = force transmitted to bias bar.

After this I have pressures generated at master cylinder etc, but id like some references to where I can find a suitable equation to calculate the needed foot force. My idea was to take real tests, and set up a table, but I haven’t managed to get hold of a device which I can strap to my foot, while im braking in my car!

any help appreciated,

jOn