Wilwood 340-11299 Reverse Swinging Dual Brake Master Cylinder And Clutch Pedal Assembly

This pedal assembly shares the same 3" x 7-1/2" bolt pattern as Tilton's 72-608 pedal assembly. The bias bar inside Wilwood's brake pedal arm is 3/8". It can be upgraded to 7/16" if you purchase Jamar or Tilton's brake bias balance bar if you're concerned about bending Wilwood's 3/8" bar.



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.

For the tandem brake master cylinder pedal, offroad trucks and buggies will have more bias to the rear brakes. 60% rear and 40% front is a common starting point, with a lot of offroad racing vehicles ending up at 30% front and 70% rear. Opposite of a street vehicle.

For the single clutch master cylinder pedal, here is an example of the math. Pushing the clutch pedal with 100 pounds of force, a 6.15:1 pedal ratio and a single 3/4" bore master cylinder:

Pedal force at master cylinder:
100 lbs x 6.15 ratio = 615 lbs

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

Line pressure:
615 lbs ÷ 0.4418 in² ≈ 1392 PSI

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Results

On the right hand side clevis you'll notice a tiny slotted screw with a jam nut. The tip of that screw has a spring loaded ball that clicks into a groove cut into one side of the 3/8" shaft. Every 360 degree revolution, the ball snaps into that groove. If you're using a dash mount bias adjuster knob that already has a detent click, then you can simply remove the slotted screw from that clevis.