Here is a quote from the brake company Stoptech.
"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."
There is a lot of interesting reading on this site about the physics of
stopping. http://www.stoptech.com/
Enjoy,
Greg
-----Original Message-----
> The real reason that rotors were cross drilled was
> to reduce weight for
> racing applications.
> Carroll
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