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  1. jupilerman

    1.75" 4-pot on vac boosted 23.8mm master cylinder ?

    Hi JPR! I did some more research and came up with a spread sheet that calculates the brake torque requirement, hence clamping force dependent upon the rotor diameter. Using 1.75" pistons in the front, lead to massive shift of required line pressure. The rears would need way less pressure...
  2. jupilerman

    1.75" 4-pot on vac boosted 23.8mm master cylinder ?

    Agreed. Booster decreases the load to be applied to the pedal to get the same pedal/MC travel as w/o booster. Should have known this! Off course it is merely the pedal lever that determines the travel distance of the pedal relative to the plunjer. If the plunjer as you say doesn´t bottom out...
  3. jupilerman

    1.75" 4-pot on vac boosted 23.8mm master cylinder ?

    >>The booster ratio, and pedal ratio have little to do with >>it, except for their effect on pedal travel. From reading this sentence, I´d say they do have effect on pedal travel! Point taken re the bias though. Don´t know the stroke of the MC, but I believe it will not have 70% more volume...
  4. jupilerman

    1.75" 4-pot on vac boosted 23.8mm master cylinder ?

    Well I thought is wasn´t that straightforward! BTW, Measured the brake pedal ratio which is 3,3 : 1
  5. jupilerman

    1.75" 4-pot on vac boosted 23.8mm master cylinder ?

    Hello! I recently purchased 4 pot calipers with pistons 1,75" (44,45mm) in diameter. To be used on front wheels OEM caliper: 1 piston, floating type, 48mm (1.89")diameter Master cylinder : 23.8mm (0.95") Vacuum booster ratio: 4.6:1 brake pedal ratio: unknown From what I calculated I will...

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