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The size of the master cylinders is used to fine-tune the brake balance in the car. For asphalt racing, most drivers use a smaller bore cylinder on the front brakes and a bore one size larger on the rear brakes. Because the front brakes do 75 percent of the braking, this setup gives the front brakes more pressure. Some racers are installing the same size master cylinders and using the balance bar to fine-tune the brakes.