Internal leaks in load leveling suspension in rear may cause rough ride on Mercedes-Benz 600SL

Problem Description and Possible Solution
Internal leaks can cause problems with the load leveling suspension in the rear; the vehicle may ride harshly (no give in the suspension, like you are riding on a brick).
Problem Data
RepairPal Verified
Average mileage: 70,000 (55,000–85,000)
1 model year affected: 1993
3 people reported this problem
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Leveling suspension failure. Possibly valve failure?