Many times on cars w/leveling system the accumulators that are actually where the "shock" takes place go bad. When this happens the car will ride hard as there really isn't any shock control. Many times this will destroy the control piston in the strut leg(shock), & then comes the clunking noise!

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MERCEDES BENZ MASTER GUILD TECHNICIAN
ASE MASTER TECHNICIAN
27 YEARS DEALER M.B. Shopforeman
190E 2.3 ITS RACECAR
1986 190E 16V