Well now that you have fully explained the symptoms, you need to reread my original reply. You have a stabilizer link that has come apart at one end and its beating against the wheel or axle. The part is MB# 123 320 09 89 and list for $10 each; replace both sides. Its an easy job with the wheel off.
Owner 24 bay BSC
Bosch Master, ASE master L1
26 years MB technician
[This message has been edited by stevebfl (edited 07-28-2000).]