Originally Posted By: rpn453
Originally Posted By: Quattro Pete
Originally Posted By: SLCraig
Good luck getting a rotor that doesn't warp over time.
I had a set of OEM rotors (Balo, I think) put on the 530i about 20k miles ago. They still appear to be straight.
There's a lot of things that can cause warping... uneven pad material deposit is probably most common, followed by improperly cleaned hubs prior to rotor mounting. Unevenly torqued lugbolts supposedly also cause issues.
He was probably talking about that specific application. Lots of vehicles have no problems with rotor warping. My ex's '93 MX-6 original rotors are still perfect at 130k miles, while my mother's '99 Sunfire rotors seem to warp the instant they touch the hub!
My mom's corolla at 180k still has the OEM rotor, not worn or warp.
My Integra's OEM rotor didn't warp at 150k, and the replacement rotor didn't warp at 220k
The only OEM rotor I have seen that warp at 30k and 70k again after turning is the OEM Ford/Motorcraft, and on this car from what I know it is a common problem. Undersized brake seems to be the problem (along with other undersized suspension parts like tierod end link, ball joints, etc).