Classic thrust arm bushing wear is vibration under light braking. If the shimmy goes away under medium to heavy braking, 99% thrust arm bushings. Look at threads about using either the heavy duty X5 bushings as replacement or for a real step up (and $$$), Dinan monoballs.I'm getting a wobble in the steering wheel under braking but nothing during acceleration. I also got the car off the ground to check if there was any play in the wheels and their solid. Visual inspection showed no signs of any damage either.
Had that once on my e34m5. At it's worst I had to really fight to keep it straight!On my E36 when those bushing went the car would dart left and right under regular driving as it tramlined and followed grooves in the concrete and the crown of the road. By the end it was downright dangerous.