The active body control system can leak fluid from numerous areas, including the tandem pump, hydraulic lines, struts, and/or seals. If it is not repaired, the vehicle ride height could drop too low and cause damage to the undercarriage.Google+
Car Problem Reports
Mercedes-Benz S500 Active Body Control System Can Leak Hydraulic Fluid
Mercedes-Benz S500 Problem
Average Mileage: 107,700 mi (10,800 mi - 189,000 mi)
The car is too low to drive.
Visitor, 2001 Mercedes-Benz S500, 90,000 mi
Right front sits down after 3 days sitting idle. Filtered fluid and changed filters several times. Finally notice leak from Steering pump with needed to be replaced at a cost of $4000. After repair, shop stated that it still sits down and may require additional valve block replacement, and additional $2800.
Visitor, 2001 Mercedes-Benz S500, 10,800 mi
my hydraulic is leaking