Check both ends and the large mounts forward of the wheel under the radiator (more or less) that mount it to the body.

Disconnect at both ends, and take it for a drive. If it stops, replace rubber.

Check play with the wheel/tire installed. Lots more leverage.

Jim

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14 E250 BlueTEC black. 45k miles
95 E320 Cabriolet Emerald green 66k miles
94 E320 Cabriolet Emerald green 152k miles
85 300TD 4 spd man, euro bumpers and lights, 15" Pentas dark blue 274k miles