Actually... he is more right than you guys are. Braking is 100% limited by the grip of your tires. He is also right that the pressure is spread over a larger surface which makes braking modulation easier as well as heat dissipation. The materials used are also part of the mix, sport brakes tend to have less flex to them and are designed to transfer more of that pressure to the rotor.
Another thing to keep in mind axeman71 is that you're making an assumption that bigger = better and thats not true. AP Racing 6-pot brakes are better than a lot of those 8 pot show brakes that take up half the rotor.
Also, I dont want to repeat what everyone else already said, but more surface area to create friction with..
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