Jamar Performance 17-1/2" Forward Swinging Brake Or Clutch Single Master Cylinder Pedal Assembly

When selecting a master cylinder, 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. For brakes, you need to make sure that you have enough volume to supply your brake calipers, but at the same time, enough pressure.

For this single master cylinder pedal, here is an example of the math. Pushing the clutch pedal with 100 pounds of force, a 10:1 pedal ratio and a single 3/4" bore master cylinder:

Pedal force at master cylinder:
100 lbs x 10:1 ratio = 1000 lbs

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

Line pressure:
1000 lbs ÷ 0.4418 in² ≈ 2264 PSI

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