About your brake-ish juddering, it could be (I don't know the suspension tuning on your cars), as W.S. said the control arm bushings up front, but they usually are also felt just cruising. It could also be a loose caliper mounting bolt/pin that's allowing too much motion, or possibly some pad material stuck on the rotors.
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2012 BMW 328i 6-Speed Wagon | Deep Sea Blue with Grey Dakota Leather | Manual Swap, 330i Intake + Tune, 3.15 Helical LSD, Öhlins R&T
(SOLD) 2009 BMW 128i 6-Speed Coupé | Monaco Blue with Black Sensatec | chris_flies' 128i thread
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