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Originally Posted by Greg
The part I laugh at the most is the size of the brakes on STREET CARS... because if the car doesn't have ABS -- then the most braking the car can do is whatever the TIRE / Contact patch is capable of. 6 piston Brembos - locked up are probably every bit as good as a single piston PBR.... if they're locked up and you're skidding it doesn't matter how "big" they are.
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That's not quite true. Bigger rotors give you more leverage to stop the car, without as much clamping force. It means that at near threshold braking the brakes are easier to control as the tire nears its loss of traction threshold. Another plus of bigger rotors is that the additional mass of the rotor itself can dissipate heat and help reduce fade -- not important on the street where a panic stop per year is too much. But on the track, every turn is a quasi-panic stop, and heat dissipation is vital.
Another way of looking at it is this: if locking the brakes was the goal... we'd still be using drum brakes, which can lock up a tire very easily.