jim beam wrote:

that's doesn't in the least explain how i go to a shop for tire
replacement, and driving home, my disks are "warped". i take the wheels
off, clean up the hub, torque with a three-stage sequence, and then my
disks are unwarped again.

Just to be clear, I never said the disks actually warped.

Anyone who says that rotors commonly warp is clearly heading back
to the village missing its idiot.

However, to be 'fair', a lot of what people call warp is simply
runout, which is what I think you're referring to (since you could
never correct true warp short of machining the rotors).

A lot of other times, what people call warp is merely uneven pad
deposition, which, oftentimes, a rebedding run (especially one
with very harsh pads) will scrape clean & eliminate the judder.

Whatever they 'call' it, it's not warp because you can MEASURE
warp and they never ever measure it! Those who do, find out that
it's not warp. It's really that simple. Those who insist it's
warp seem to have no resistance with the q-tips in the ears.

This thread seems to be going in the right direction which is
to find the true cause of judder.

I will also try to read those scientific papers that were posted.

http://www.researchgate.net/publicat...7d38711887.pdf
http://sem-proceedings.com/20i/sem.o...-Roughness.pdf
http://sem-proceedings.com/14i/sem.o...Prevention.pdf
http://www.mecheng.osu.edu/adl/files/adl/C12-1.pdf
http://www.ehu.es/compmech/welcome/d...mputations.pdf
http://researchbank.rmit.edu.au/eser.../Rodriguez.pdf
http://eprints.hud.ac.uk/3878/1/2008-01-0818.pdf
http://cdn.intechweb.org/pdfs/5380.pdf
http://www.acoustics.asn.au/conferen...papers/p46.pdf
http://www.hitachi.com/ICSFiles/afie...009_07_107.pdf
http://ejum.fsktm.um.edu.my/article/1146.pdf
http://eprints.hud.ac.uk/3797/1/10_P...l_D_Bryant.pdf
http://www.mecheng.osu.edu/adl/files/adl/J187.pdf
http://pid.sagepub.com/content/217/6/419.full.pdf