Just "re-discovered" this thread and have an update. The wobble in the front was caused by loose lug nuts (RF). I was so focused on finding another, more complicated solution, that I hadn't considered the most obvious and simplest fix. Fortunately, no harm was done while the nuts were loose, but this incident has made me more aware (again) of the importance of the driving experience. Proper maintenance, quick inspections (and corrections while still relatively inexpensive) of the simple things as well as the hi-tech, high-dollar stuff we worry about. In exchange, your BMW will reward you with a great deal of driving pleasure, instead of trip after trip to the garage. Then there is the withdrawal and inconvenience of it all. This is all part of my quality of life. M3 forever!!! Lug nuts! Who knew!
...feelin' kind of silly right about now...
face="Lucida Sans Unicode">...<BR>> >> My bet: a front brake caliper is
seizing.<BR>> >><BR>> >> This is pretty common. The front
calipers slide back and forth on metal<BR>> >> rods; any dirt or
corrosion on the rods and the caliper seizes, then<BR>> >> when it gets
hot it gets VERY grabby.<BR>> >><BR>> >> Next time this
happens, stop the car, get out, and sniff near each<BR>> >> wheel. If
you get a strong odor of brake dust that's a big clue. (You<BR>> >>
might also notice that one wheel is getting MUCH dirtier than the<BR>>
>> others). You can also CAREFULLY touch each wheel - one might be<BR>>
>> significantly hotter than the rest.<BR>> >><BR>> >>
If it's under warranty, then BMW replaces that caliper, the pads, and<BR>>
>> the rotor, and then fills and bleeds the fluid.<BR>>
>><BR>> ><BR>> > <BR>> </FONT></BODY></HTML>