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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When was the alignment last done?– hctedCommented Dec 21, 2013 at 7:26
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Also, have the shocks been replaced recently?– hctedCommented Dec 21, 2013 at 7:26
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YouTube "BMW Control arm bushes E46 or Z4 / Z3 How to DIY: BMTroubleU"– Allan OsborneCommented Dec 21, 2013 at 15:08
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1 Answer
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
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2What is meant by "excessive movement"? How do you check for this on this vehicle? Where is this bushing located exactly? Do you have a picture of this or a link which would show exactly what you are talking about?– Pᴀᴜʟsᴛᴇʀ2 ♦Commented Dec 21, 2013 at 13:51
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BMW Control arm bushes E46 or Z4 / Z3 How to DIY: BMTroubleU. Commented Dec 21, 2013 at 14:05