on mine it was the calipers. They have rubber pieces they ride in (as breaks wear) and they seemed to wear and get loose. bavauto has these metal...
i believe bavauto has them both the amber bulbs and the "stealth" bulbs
if there is 200k and they are the original belts I would have them replaced. They are relatively inexpensive and easy to replace. Check the surface...
i second the rubbing alcohol it works very well most of the time
I have had a similar issue with my 540. When turning into a space it was as if the power steering stopped working. I checked my power steering fluid...
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