Using a small bore sized master cylinder will provide a hard pedal and ultimately deliver a 25mm to 40mm movement to full lock up. The smaller the pedal movement the better, again this will be determined by condition of the hoses, pivot points, calipers etc.
The most common master cylinder sizes are .625 / .7 / .75. From our experience we have found that a good starting point to good brakes is .625 Front, .7 Rear and .75 or .7 on the Clutch.
Check the brake line pressure in each instance, you are looking for between 1100 psi - 1200 psi. If you are achieving this required pressure and the brakes are still not up to standard then you will need to check all the hard wear and hoses are in good working condition. If all the equipment is in good working order then you will need to increase the size of the caliper and rotors, this will improve the brake efficiency.
This is all achieved my a correct combination of brake cylinder piston bore size, brake pedal ratio, correct fluid, no air in the lines, non-ballooning brake lines, minimum component wear anywhere in the braking system and the drivers ability to deliver the required force on the pedal consistently in race conditions. All this is not easy to achieve, but it is the aim.
If the brakes are still not up to the required stopping efficiency when all of the above specifications have been attained then you will be looking into upgrading the rotors, calipers and pads. Increasing the brake friction area will increase the brakes effectiveness.
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