This is why Manybrews is semi-correct about rotors

[Auto-9]

This is an article (a long one) detailing why some people choose "normal" rotors, while others use cross-drilled or slotted. It's very in-depth by a manufacturer, should prove to be enlightening for those of you that keep asking "why or why shouldn't I..." questions regarding rotors.

[Strahan]

Hehe.. amusing, the two posts contradict themselves:

>It was an effective solution, but today's friction materials do not exhibit the same gassing out phenomenon as the early pads.

>When the friction surfaces of a rotor are smooth and flat, there is no means of escape for the gases and dust which build up between pad and rotor. / The drill holes (which are sometimes called "gas relief openings) provide an exit route for the dust and gas.

>Contrary to popular belief they don't lower temperatures (in fact, by removing weight from the rotor, the temperatures can actually increase a little)

>The holes are also commonly labelled "cooling holes" because of the improvements they make in this area.

[bronxbombr]

[Jet Black]

And yet again Im left scratching my head.

[TJC]

TMI. http://www.stoptech.com/faq/

[peanotation]

even if you dont read about it at all...cross drilled and slotted rotors would make logical sense to prove the point that they're better for a variety of reasons, and as always with any upgrade, there are a few minor drawbacks.