Tilton Racing 72-607 Forward Swinging Dual Brake Master Cylinder And Clutch Pedal Assembly

Tilton's 600 series pedal assemblies feature traditional fixed mount master cylinders and a brake balance bar that provides excellent performance at a competitive price.

Features:
• Uses standard 2-1/4" vertical bolt pattern master cylinders
• Uses 5/16"-24 studs to secure master cylinders
• The clutch pedal heim joint and brake pedal balance bar all use 5/16"-24 push rod master cylinders
• Forged aluminum pedal arms with adjustable (vertical & horizontal) foot pads and grip tape
• Nine adjustable pedal ratios (6.25:1 to 7.25:1) enable the brake and clutch pedals to be tuned to driver preference
• Large diameter 7/16"-20 balance bar provides maximum rigidity. PTFE coated aluminum clevises for increased durability and reduced friction
• Pedal pivots feature wave washers to reduce lateral pedal movement and oil impregnated bronze bushings decrease friction
• Lightweight aluminum frame
• Four 5/16" smooth mounting holes on the sides
• Two additional 1/4"-20 threaded holes on the bottom edge near where the master cylinders mount
• Pedal pad brackets can be mounted in 3 positions vertically with 7° of forward or 7° of backward tilt
• Pedal pads can be mounted in 4 positions vertically to change pedal ratio

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 6.25:1 pedal ratio and a single 3/4" bore master cylinder:

Pedal force at master cylinder:
100 lbs x 6.25 ratio = 625 lbs

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

Line pressure:
625 lbs ÷ 0.4418 in² ≈ 1415 PSI

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Results

Pedal ratios for this pedal assembly were calculated based on 1.62" from the arm's pivot to the center of master cylinder's push rod. The pedal pad brackets have 4 holes. Sticking with Tilton's requirement of 2 bolts being used that are not adjacent to each other, you end up with 3 vertical positions of the pedal pad bracket and 4 positions of the pedal pad itself which gives you 12 positions that the pedal could be in and 9 different pedal ratios.

Pivot to center of pad divided by pivot to center of master cylinder push rod equals the pedal ratio:

10.125" ÷ 1.62 = 6.25:1
10.500" ÷ 1.62 = 6.48:1
10.875" ÷ 1.62 = 6.71:1

10.625" ÷ 1.62 = 6.56:1
11.000" ÷ 1.62 = 6.79:1
11.375" ÷ 1.62 = 7.02:1

10.500" ÷ 1.62 = 6.48:1
11.000" ÷ 1.62 = 6.79:1
11.250" ÷ 1.62 = 6.94:1

11.000" ÷ 1.62 = 6.79:1
11.500" ÷ 1.62 = 7.10:1
11.750" ÷ 1.62 = 7.25:1