Can someone take a pic of...

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Woo-hoo! School's in!

Vented brake rotor:
rotorpic.jpg

brake_rotor_comp_thick.jpg


See how there's a space between the inside and outside surfaces of the rotor? That allows air to circulate through to cool the rotor. The spaces extend to the inside of the rotor, near the hub, so air can come in there and blow out the outer edge.

Cross-drilled brake rotor:
rotorsbox.jpg


These are actually vented and cross drilled, which is a fairly common combination. The holes add surface area to the rotor to allow more heat to be dissipated with the added benefit of allowing brake pad dust and gasses to be expelled through the holes. The downside is you lose rotor face area (less area for the pads to grip) and the holes can make the rotor prone to cracking.

Slotted brake rotor:
slotted.gif


These too are usually vented and slotted. Slots are machined into the face of the rotor, but they don't go all the way through. The slots serve some of the same purpose as the cross-drilling. Namely, they allow gases and dust to be removed from the roto face efficiently. The slots do not weaken the rotors like drilling does, although they don't help in cooling as much as the cross drilling does.
 
I remember somebody (big_ben?) saying the braking was impressive compared to the MP3. He actually said it was the one thing that struck him as the biggest improvement, of course, he was coming from a turbo'd MP3, so I guess that makes sense.
 
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