Why cross drilled rotors?
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. Q:Is it worthwhile changing my rear drum
