Re: UFO brakes

[Wolff <quattro200@earthlink.net>]

FBFISH@aol.com wrote:
> 
> In a message dated 3/12/99 3:26:36 PM Eastern Standard Time, quk@isham-
> research.demon.co.uk writes:
> 
> << I disagree.  They're sound engineering and provide the sort of stopping
>  power that a car of that size really needs if it's going to be driven
>  by anyone other than an undertaker's chauffeur.
>   >>
>  Well said Phil, I have over 120 Kmiles on mine and never had a problem. I am
> curious about all the warping one reads about on the list. Does anyone have an
> "engineering" explanation?
> Frank Santoro
> 1990 V8
> 1998 A8

I can say for sure that although my UFO's pulsated noticeably, they were
not "warped". The runout was about .001" (yes, only one 1000th). The
hubs just for comparison were about .005" out and that's at a much
smaller radius too. The rotors were turned and the pulsation was cured
without doing anything to the hubs. (Prior to turning the rotors, the
front wheel bearings and all subframe bushings were replaced with no
noticeable effect on the shimmy. ) I think that the pulsation is due to
an uneveness in the friction surface of the rotor. One portion is
grabbier than another.  I have no idea what causes this. It also could
be that some rotors warp and others like mine were, are uneven. Has
anyone else measured the runout (off the car) of their "warped" UFO's?
Wolff