In order to have the best brakes possible, it is absolutely necessary to combine the ideal pedal ratio with the proper bore size master cylinders. Whether you are using a single master cylinder, or dual master cylinders on a balance bar, the basic following concepts apply.
Using the illustration at the right, take your pedal measurements and calculate the pedal ratio. Distance "A", divided by distance "B" is your ratio. Measure your "A" distance to the center of the pedal. A ratio of about 6/1 is ideal for most racing. If your ratio is higher, you will develop a higher line pressure for the same amount of input effort, but you will pay for it with a longer pedal travel. To decrease the pedal travel, you can 1. Use a larger master cylinder, 2. Use a pedal with a lower ratio. Either way, you will have to push harder to develop the same line pressure. It is up to you what you want the most, short travel or ease of pedal effort. The combinations of pedal ratios and master cylinder bore sizes are endless, but the most common combination as are as follows:
1. Most asphalt racecars 6/1 pedal ratio, 7/8" master cylinder for the front brakes, 1" master cylinder for the rear brakes.
2. Most dirt race cars, 6/1 pedal ratio, 1" master cylinder for the front brakes, 7/8" master cylinder for the rear brakes.
3. Most 2-brake dirt sprint and midgets, 6/1 pedal ratio, 7/8" master cylinder.
4. Most 3-brake dirt sprint and midgets, 7/1 pedal ratio, 1" bore master cylinder.
If you have a special situation, feel free to call "The Brake Man", any time for assistance. We have the answers!