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Old 05-22-2002, 04:44 PM   #1
Jon Bogert
Scooby Specialist
 
Member#: 1133
Join Date: Mar 2000
Location: SE PA
Vehicle:
09 GTR, 02 996 C4S
95 993 C4, 71 911, 04 STI

Question Wanna help me do some brake math?

The question for all you brake engineers is: what size master cylinders (F & R) would you recommend? Please support your answer with at least a little bit of math.

Here are the parameters:

Brake rotor diameter: 260mm F, 220mm R
Effective radius (to center of pad): 110mm F, 95mm R
Caliper type: 4 pot (2 per side) F, 2 pot (1 per side) R
Caliper piston area: 31.1cm^2 F, 15.6cm^2 R
Pedal ratio: 5.5:1
Vehicle weight: 1500lbs
Desired braking force ratio: 80% F, 20% R
No booster--all manual.

I think that's all you should need--let me know if I missed something.

Thanks!

Jon
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