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Old 05-22-2002, 10:24 PM   #8
romanom
Scooby Specialist
 
Member#: 16215
Join Date: Mar 2002
Location: In a place with no laws, just "guidlines"
Vehicle:
2002 WR WRX wagon

Default

Summary of Equations:
(for ease and consistency try and use meters and kg)

1.
stopping force = weight of car * longitudal coefficient of friction of tires


2.
Stopping Force = pedal force * brake pad coefficient of friction * mechanical force ratio * (1/radius of the tire) * brake rotor effective radius

.....solve for mechanical force ratio


3.
Front Force = weight front + total weight * tire friction * height of CG * (1/wheel base)

4.
Rear Force = weight rear - total weight * tire friction * height of CG * (1/wheel base)


5.
% front = Front Force/Stopping Force


6.
% Rear = Rear Force/Stopping Force

7.
mechanical force ratio front = mechanical force ratio * %front
mechanical force ratio rear = mechanical force ratio * %rear


8.
Take that ratio and divide it by the pedal ratio.

This is the ratio of mastercylinder bore area and caliper piston bore area.

So say a 4:1 then for a 30cm^2 caliper piston you want a 7.5cm^2 MC or ~28mm bore MC.
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