[200q20v] Re: [V8] just out of curiosity (UFO question)...

Wolff wolff at turboquattro.com
Thu Feb 1 19:40:44 EST 2001

I agree that the little anti-vibration device is way to small to affect
pulsation under braking.
Remember that my opinion is that UFO's pulsate not because of warpage, but
due more to some surface problem on the rotor.  I had runout of less than
.001 inch and had pulsation. Turning the rotor stopped the pulsation even
with .005 inches of runout on the hub. In other words, it wasn't the runout
of the rotor or the hub causing the pulsating brakes. It was the surface of
the rotor being grippier part the way around.  I wish I had some high
resolution photos of the rotors before they were turned. Maybe we could have
spotted a difference.

> See above.  I suspect that the caliper vibration is not really the
> problem that causes UFO rotors to warp.  It probably has more to do with
> coming out of warp speed too fast.
> > easier to completely remove the thing and check if the problem
> > actually worsens. I assume it unscrews from the caliper body.
> Try it, and report back please.  I'd be glad if you proved me wrong.
> > Also, if this damper is effective (and would Audi ever do something
> > that's ineffective?)
> Never!  Perish the thought.
> :-)
> Later,
> Graydon D. Stuckey
> http://elektro.cmhnet.org/~graydon/

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