37 Why cross drilled rotors?
Description
This article is from the VW Performance FAQ, by with numerous contributions by Jan Vandenbrande others.
37 Why cross drilled rotors?
A:Braking produces gasses, and cross drilling give the
gasses a way to escape, thereby increasing contact
pressure. In addition, a cross-drilled rotor now has more
surface area, and thus cools down more quickly.
Personally [Jan] I do not advice cross drilled rotors
because of the increased likelihood of cracking. DO NOT
CROSS DRILL ROTORS YOURSELF. It's usually done on an NC
machine at calculated positions followed by stress
relieving.
The comments from people on driller rotors are that they
improve braking under competitive situations, but only
provide a marginal benefit under normal street use. The
also feel more uneven when you brake (esp. the slotted
ones) and are also noisier (they "humm"). Note that cross
drilling is actually banned for certain competitive
events, so check before you invest. Cross drilled rotors
will also wear out your pads in a big hurry.
Another alternative to x-drilling rotors is to buy
slotted or grooved rotors and pads.
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