Recently got our 2012 Mz5 back from having the clutch, RMS, and all 3 powertrain mounts replaced. A few days later, I had to brake pretty hard over a rather bumpy section of road and got a mighty clunk from the front left. Car seemed fine afterward, but then twice more on the drive – once while braking over bumps, and another time when hitting a bump while turning – I got a smaller but pretty sharp clunk from the same corner.

Since then, I occasionally get the same clunk, most of the time from the front DS but occasionally from the front PS. Only happens on sharp acceleration or braking, especially on uneven surfaces. Sounds like a rock hitting the underside. Once or twice, I had it clunk once under braking and then clunk again while setting off under mild acceleration, almost like something had clunked out of place under braking and then clunked back into place when the suspension loaded in the other direction.

Front control arm, strut, strut mount, and all bushings and ball joints on that corner have ~8k miles or less on them.

Thoughts on what to check? The mechanic and I are stumped!