From digest.v6.n111 Fri Jan 24 01:07:50 1997
From: kenneth inn <keninn4_at_airmail.net>
Date: Thu, 23 Jan 1997 20:56:20 -0500
Subject: RE:Jeff Suclla, M3 rotor warpage

Never, never, never machine or surface your rotors. the max wear on most BMW rotors is only 1mm, so turning them only makes them thinner, and more suseptable to warpage. the early rotors for the M3 were modified 3 times, finally ending up with the same rotor for the evo 3, part nr 34 11 2 226 813. We sell a lot of these rotors, so if you have the original set of rotors on your car, you need to get the newest ones. they are made of a different alloy, and seem to have cured most of the problems.