Quote:
Originally posted by Jon Bogert
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:
Code:
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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You did it right!
Now keep in mind that if you want less pedal force (lower effort) then you will need a larger bore MC.
Now imagine that a 23.88mm MC is a commom size on many smaller cars. Now with out a booster it's nearly impossible to stop those cars. The only reason you can get away with a 23 is that the car is so light.