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Old 05-25-2002, 11:25 AM   #3
romanom
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Member#: 16215
Join Date: Mar 2002
Location: In a place with no laws, just "guidlines"
Vehicle:
2002 WR WRX wagon

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I never posted this before, because to be honest to me it's obvious. But to others it might not be.

The formula below is a decent way to estimate what, if any, increase you have in brake torque after an upgrade:


Brake Torque Increase %=

[(caliper piston area new/old) * (effective radius new/old)* (brake pad friction coefficient new/old)]

*effective radius is the distance from the center of the hub to the center of the brake pad

*For sliding calipers multiply the areas by 2

Any answer equal to 1 means no increase. Any answer less than 1 means you've gone backwards. Any answer greater than 1 means a torque increase.


This will NOT give you the actual brake torque, just the difference.


Now things like steel lines, stiffer calipers effect feel not performance. Only force applied, torque arm and friction do that. You can change things like lines, calipers, pedals and boosters to change the characteristics. Such as, initial bite point and initial deceleration level, pedal travel and effort, pedal force mulitiplication. However, these do not actually produce more brake torque.
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