Old post, but I'll answer with what Porsche used to have on their website about their drilled rotors, which is that they help wet braking by allowing water/water vapor a place to go besides out between the pad and rotor when the calipers clamp.its a good read, but i have to wonder why Mercedes Benz S class sedans on the early 1990s sometimes came with cross drilled rotors when their wheels look like this:
i mean, if its just for looks. there has to be something else, right?
You then go and say its still bad? I dont think you have any idea what a slotted rotor will do and your article starts off with a cliff note that no one needs it. Thats absolutely wrong!QUOTE
StopTech provides rotors slotted, drilled or plain. For most performance applications slotted is the preferred choice. Slotting helps wipe away debris from between the pad and rotor as well as increasing the "bite" characteristics of the pad. A drilled rotor provides the same type of benefit, but is more susceptible to cracking under severe usage. Many customers prefer the look of a drilled rotor and for street and occasional light duty track use they will work fine. For more severe applications, we recommend slotted rotors.