All else being equal, if the pads are forced against the rotors with greater force, generating more friction (and heat), then more braking torque is generated and the vehicle stops more quickly. Therefore, if the driver adjusts his braking to stop in the same time/distance, the same amount of braking force and heat is generated. Vented, slotted or drilled rotors increase the surface area exposed to cooling air, so such rotors will cool faster and thus better resist fade, but not necessarily reach or remain at a reduced peak temperature.

Currently, slotted rotors are in favor for performance because they reduce fade (gas transfer away from the rotor surface) and might help to reduce glazing.
Drilled rotors are mainly cosmetic these days, although they are lighter.

Both slotted and drilled rotors increase pad wear compared with plain rotors because the edges of the holes or slots act like a cheese grater to the pad's cheese. Just how much wear increases depends on pad composition, number of slots or holes plus how sharp-edged the slots or holes are. Obviously the increase in pad wear is variable, but empirically it doesn't seem to be a major bother; pad glazing may be reduced because fresh material is more quickly exposed; and generally the benefits of slotted rotors outweigh the increased pad wear. Finally, standard pads can be used with slotted rotors as a pad hard enough to resist the cheese-grater effect will rapidly wear down the rotor


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