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Old 05-12-2005, 02:11 PM
Andre Yew Andre Yew is offline
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Location: Santa Barbara, CA USA
Join Date: Jan 2002
Posts: 371
Mein Auto: 2000 E46 328Ci Bright Red
Besides the cross-drilling, the ZCP rotors are also floating rotors with aluminum hats. The hats reduce weight, but are prone to cracking as well, and must be checked periodically. I believe that because of liability fears of hat fatigue, the Euro M3 brakes weren't offered in the US initially. The floating rotor accommodates heat expansion radially so the braking surface stays planar instead of bowed.

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