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Message: <blockquote data-quote="Mr. OAM" data-source="post: 188674" data-attributes="member: 9816">The purpose of the slots are for the gasses that are produced by the friction material on the pads to escape during racing and hard braking. The holes are for the ducted air to blow through to help cool the rotor. As for why the rotors heat up on the street, imagine a regular rotor and a slotted and drilled rotor of the exact same size. The one without the slots and holes has more metal to it which means there is more material to absorb the heat from the pads making friction. In the rotor with the slots and holes there is less material to absorb the same amount of heat, so it gets hotter sooner because of the lack of ducting of fresh air like in a race car. This means it is subjected to more heat than a regular rotor and suffers from building hard spots (especially around the holes) sooner which can cause a pulsating pedal and cracks in the rotor.It also depends on how you drive the car. If you drive it carefully you will not see these results as fast. If you drive it the way you intended, which was the reason for getting performance brakes in the first place, then they will show up sooner.Steve</blockquote>