Every time I go into rough terrain, specifically bumps or speed bumps, there is a thud sound from the front end. Thinking it might be the bushings but I'd prefer not to purchase without confirmation.
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Knocking and squeaking on the Beamers front end usually ends up at the 'bottom-arm rear-bushes'. Check the bushing for excessive movement.
A bottom arm bush failure can be diagnosed on the road by a quick 'stab' of the brakes whilst driving the vehicle. There will be a thud through the steering.
Before stabbing the brakes on the road, make sure the traffic, if any, is not too close!
EDIT - YouTube Video: BMW Control arm bushes E46 or Z4 / Z3 How to DIY: BMTroubleU