Since braking is about taking care of heat the mass of the rotor is important. A heavier rotor can take away more heat than a light rotor. In other words a heavy rotor is better if you are going to drive your car hard.
This has been discussed many times and this also explains why you shouldn't drill holes in rotors. Driling removes mass and therefore reduce the rotors brakeeffect.
All brake systems can handle ONE hard brake but a good system should be able to handle many hard brakes in a short time.
Jan
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