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Sorry for resurrecting the old thread guys.
I found the cause of vibrations in my case so wanted to share it in case someone will search in the future.
Story:
I have intermittent vibrations (at speeds over 60 - 70mph) on my e92.
I have read this whole thread and was ready to diagnose everything listed here.
My main suspicion was towards rear brake calipers intermittently sticking. So I took the spray bottle and after my trip to work (around 35mins on motorway) I've sprayed all brake discs with water - aaand nothing. After my commute back home I decided to repeat the test and after spraying the rear nearside disc it greeted me with generous amount of steam and sizzling sound. The other 3 corners were barely warm.
So now I'm 95% sure I found the culprit of my problem.
The reason why I was suspecting my brakes is because sometimes in the mornings when reversing back I could feel some resistance, I thought I was hitting a curb or something.
I hope this helps somebody in the future! And remember - if they are sticking intermittently the problem may not reveal itself every time when checking this way with spray bottle.
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