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TurnAround, Good thoughtful post and wonderment...
I opin'd in a similar, recent thread, that while all the various suggestions
and "fixes" are good and reasonable, no one seems to have gone through
the process of doing one thing at a time to determine which "fix" did the
fix. And, I suspect that while the wheel shimmer/brake shudder situ is
quite common, it may be due to slightly different cause(s) on different
cars...just a wildazz theory. I wish my Indie, doing the repair below, had
done the bushings first and then the new tires/meticulous balance to determine
(in my mind, for my car), which fix really cured the problem...
My opin from a previous thread:
"Late summer of this year, I go to my Indie, a very knowledgeable shop in Asheville, and ask them to go through the entire front end and do some
high speed braking tests. They said the front end was in remarkably good shape and they also could not dupe the feeling. But, my oe B'stone Turanzas
that I got with the set of 19" 132s from a poster here, by now had ~35,000 miles on them and they were shot. I got a new set of Diamaris slapped on,
(not sure about the raves on that brand), and had them do new thrust arm bearings, while they were there, paid for by my Warranty Direct.
The replacement front brakes job from back in '05, has 25k miles on them, and look "very good", and I really never felt it was a "brake problem", per se.
With new tires, meticulously mounted and balanced and new thrust arm bushings, the fookin high speed brake steering shudder is gonzo...
However, I can not positively pin the "fix" on the TA bushings, vs the new tires, vs a combo of the two. I guess that's my point; I have yet to read of a
step by step parts replacement/repair, with results ascertained, that has "fixed" this common problem."
Fwiw, when I had new front brake pads and rotors, (done by the dlr 30k miles ago,
under ext Maintenance), my wheel shimmy was right back the same day. Thus, I
have little faith in any combo of brake R&R fixing this ubiquitous situ, at least on my '01 X...4 thousand miles later, after that
recent new tire/bushing combo, I remain "shudder free", knock on wood.
Good thread and good luck on your search for the "cure".
BR,mD
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