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I agree with 'whatt18yahoo' this sounds like it's more likely a linkage issue than a brake issue. You can replace the tranny mount disc and it may help, when I had these sort of symptoms though it was because I had broken the central drive shaft bearing though. It is located around where your center console sits and is at the point where the trans-axle has a split. Of important thought though is why that might break; in my case, with a 98' 328i manual with around that many miles, it was that the U-joints had worn out on my trans-axle and were no longer functioning properly, so whenever I put torque on it, it would try to buckle and eventually broke the central bearing and after that would just flail around and beat up everything in the area. (I would feel vibration and a loud thunk thunk thunk under hard acceleration). A new trans-axle with new u-joints and a corresponding new central bearing and I was fixed, I replaced the tranny mount disc while I was at it since it was due.
'ChillyB' also has a good point with your bearings if your getting bad wobble. Check em out and also see if you have excessive play in your tie-rods/control arms.
I hope you figure your problem out, best of luck!
***I am not a mechanic and make no claims that any of the above info will solve your issues, use the information at your own risk - I'm merely passing along knowledge I have gained from working on my own vehicles, which may be different for yours***
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