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Old 05-22-2002, 11:08 PM   #11
Jon Bogert
Scooby Specialist
Member#: 1133
Join Date: Mar 2000
Location: SE PA
09 GTR, 02 996 C4S
95 993 C4, 71 911, 04 STI


OK, so just using the fronts--as if the fronts are stopping 100% of the weight (which isn't far off), here's what I get:

Pedal pressure          100 lbs
Brake pad Cf            0.5	
Effective disc radius   0.36 feet
1/tire radius           1.07	

All up weight           1500	
Tire Cf                  1.2	
Stopping Force          1800	

Force ratio             93:1
Pedal ratio              6:1
Caliper to MC area      15.6 	
Caliper piston size     44.5mm
Caliper piston area     3111mm^2
x two calipers          6221mm^2	
MC area needed           399mm^2
MC diameter               23mm
So I should be fine with a standard 7/8" MC
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