Originally posted by Paul Kienitz:
Originally posted by redhawk:
[b]Also (just because I haven't pulled out my flame suit in a while), I believe cross-drilled and/ or slotted rotors are am aesthetic gimmick.
You still say that when driving in wet weather?[/b]Yes. Drilled rotors were never intended to combat water. Centrifugal force keeps water off the rotors.
Drilled rotors were originally intended to expell gases from old, asbestos-based pads that would fade under hard braking because gas would build up between the pad and rotor as the pad heated up under the friction.
New techologies of brakes pads virtually eliminate the need for cross-drilling.
Slotted rotors were used to actually scrape old material off of pads. Old technology pads would glaze under hard braking. The slots would scrape off that glazing.
New pads are designed for better resistance to glazing so slotted rotors are not necessary.
SQ was right about total area and the ability to absorb heat.