I have this issue (2007 335i 90k). Braking from 100 down to 70 seems to give the worst vibrations. I cant really notice much vibration under 50. I have had new discs all round, new pads, new bushes, all 4 wheels balanced, and still have the issue. My mechanic is getting despondent with the issue and it's really frustrating that we cannot solve it.
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