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Causes to rotor warping

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Put new front rotors on my 03 Cayenne S about 15k miles ago, and now I have a warping problem (cause: shimmy when braking at higher speeds). Confirmed with mechanic buddy. I put on ATE slotted rotors... and here's the question - should I be blaming the rotor or are there other causes? Something I did/didn't do? Thanks for your thoughts on this... I'm putting OE back on.


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from my experience, it is not always brake rotor warpage but brake pad material transfer. ie: pads heat up to the point where they transfer some material onto the rotors therefore changing the runout.

what brake pads are you running?

also from experience, uneven wheel nut torque can cause brake rotor runout problems (also dirty mounting hubs)

sticky brake caliper pistons could cause excessive heat leading to pad mat'l transfer or rotor warpage

just some thoughts...

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The article from Loren is very good... of course I now question whether I broke them in correctly, if this horrible winter is causing additional transfer of materials, etc. I DO keep my foot on the brake too long after starting - I probably have imprints, which I will be able to check that out when I get back home next week and get the wheels back off. I am going to try to use the paper he suggested in the article to scrub the rotors before I replace it all... if it works I'll share out. Thanks again everybody, in all my years with Porsche's (and others for that matter) I have never experienced this. Ken

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  • 2 weeks later...

I would tend to agree with wvicary. Check the suspension first, control arm bushings and ball joints, especially if you have over 60K miles. Rare that the brake rotors are warped or you have a pad seating problem. If warped rotors, you'll feel pulsation back through the pedal.

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