The accumulators are gone! If it has even the slightest bounce, they are history. What the thumping noise is that the person b-4 you failed to replace the bad accumulators and the bouncing has caused the rear hdy shock mounts to go bad. $140-150 ea on the accumulators, $90-100 each on the shock mounts, $140 to 200 labor at a non MB dealer.

Good Luck!

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