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Thread: bigger rear master cylinder?

  1. #1
    Senior Member dpariso's Avatar
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    bigger rear master cylinder?

    I'm not happy with the manual brakes... too much effort to stop all those pony's. I have Wilwood pedals, Willwood master cylinders with Mustang GT calipers. I was thinking about getting a larger rear master cylinder. What are your thoughts about that? Would it help with stopping better?

  2. #2
    Seasoned Citizen NAZ's Avatar
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    The mechanical advantage comes from the pedal ratio (more ratio = more leverage) and the ratio between the M/C and the wheel cylinder (caliper in your case). If the M/C and the wheel cylinders were the same diameter (1:1 ratio) adding a 100lb force to the M/C would create 100lb force at the wheel cylinder. If the M/C was half the size of the wheel cylinder (2:1 ratio) a 100lb force at the M/C would create a 200lb force at the wheel cylinder.

    Installing a larger M/C will require more leg force not less. A longer pedal arm or smaller M/C will increase the mechanical advantage. However, there is no free lunch. Increasing the mechanical advantage also increases the distance the pedal (or M/C) must travel.
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  3. #3
    2bking's Avatar
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    If you want more stopping power with less pedal effort, the master cylinder size would be reduced. But it's a two edged sword because smaller cylinders mean more pedal stroke so if you get too small, the pedal will hit the floor before developing the pressure needing for stopping. I have the Wilwood brakes and use 11/16 diameter masters which reduces the pedal effort about 15% from the 3/4 diameter masters that came with the kit (2013) with no discernable increase in pedal movement.
    King
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