The hydraulic self-leveling rear suspension fitted to 560s keeps the tail level (notably under cornering) but its accumulator spheres are wear items that eventually need replacing. Owners note the system can be cheaply and reversibly converted to conventional static shocks, capping the accumulator/pump lines to remove the hydraulics.
Self-leveling rear suspension (SLS) on the 560 models
Mercedes-Benz S-Class (W126) · mechanical