Wilwood 340-16384 Forward Swinging Single Brake Master Cylinder And Clutch Pedal Assembly

This pedal assembly is unique compared to what you'll normally see in the offroad industry. Most offroad pedal assemblies have two separate single circuit brake master cylinders with a brake bias bar. One master cylinder would feed your front brakes and the other would feed your rear brakes.



When selecting master cylinders, you'll notice with a smaller bore, you get more pressure but less volume. With a larger bore you get less pressure but more volume. You need to make sure that you have enough volume to supply your brake calipers, but at the same time, enough pressure.

Here is an example of the math. Pushing a pedal with 100 pounds of force, a 7.08:1 pedal ratio and a single 3/4" bore master cylinder:

Pedal force at master cylinder:
100 lbs x 7.08:1 ratio = 708 lbs

3/4" master cylinder area:
A = π r²
A = 3.14159 x 0.375 x 0.375
A = 0.4418 in²

Line pressure:
708 lbs ÷ 0.4418 in² ≈ 1603 PSI

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Pedal ratios for this pedal assembly were calculated based on 1.5" from the arm's pivot to the center of master cylinder's push rod. The pedal pad brackets have 2 holes. You end up with 6 vertical positions (3 with short edge down and 3 with long edge down) of the pedal pad bracket that the pedal could be in and roughly 6 different pedal ratios.