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Thanks DD for this post, really helpful in summarising the procedure to try and eradicate this issue.
My worry is with my GC is the oddity of the vibration that may not pin point the exact issue either.
So initially my vibration predominantly started off with braking vibration which made me think it's warped discs. However as time went on the vibration was happening just driving at normal motorway/highway speeds. It was at it's worst at 70mph and it wasn't exactly consistent. Felt like it got worse when on high speed motorway corners with camber. The vibration was felt through the footwell, steering wheel and through the base of the seat.
I started off with Wheel Balancing and it reduced the vibration at lower speed but made no difference at 70mph. Got the alloy's checked if any had buckled but they were fine.
When I had them balanced the mechanics there noticed that the front wheels moved when applying the brakes on the ramps. Looking underneath they tried moving the control arms with a bar and there looked like there was slight movement but not much.
Also back when I had the gearbox serviced in November the mechanic there advised replacement of Rear Diff poly bush and prop mount bearing. There was no vibration back then but maybe as time has gone on this is causing the issue?
I've also been advised by local BMW specialist that Brake Control Arms could be the underlying issue with what I'm feeling. There is a distinct rhythmic feeling to the braking when at low traffic jam speeds like it is warped.
Just worried that this is going to be a lengthy and costly process of elimination but will keep everyone on here posted.
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