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 S55 AMG Active Body Control System Can Leak Hydraulic Fluid
Mercedes-Benz S55 AMG Problem
Average Mileage: 93,670 mi (10,900 mi - 145,000 mi)
I had a power steering fluid seal go bad and the garage that worked on it put power steering fluid in the ABC fluid housing which made the ABC system suck up the power sterring fluid and it caused the whole ABC system to go bad. mercedes fixed it, but it was $3000 to flush the system and buy a new pump.
starting to notice regular ABC visit workshop messages. I keep my eyes on the Hydraulic fluid levels to ensure that the system doesn't run dry. Now car won't raise or lower, also noticing continuous drip underneath the car. Seems to be occuring in the front, near pulley but can't tell due to the frame. I can see fluid dripping from the bottom of what looks like the tandem pump, but could be coming from a high pressure hose connected to it, can't tell. Starting to prepare for a huge repair bill.
Visitor, 2002 Mercedes-Benz S55 AMG, 115,000 mi
Need new ABC pump.
Visitor, 2003 Mercedes-Benz S55 AMG, 80,000 mi
My Abc pump is leaking from front seal. I disassembled the pump and i see that i must change the seal (28x40x7.6) and two or-ings.
Visitor, 2002 Mercedes-Benz S55 AMG, 114,000 mi
Active Body Control light is on and the Steering wheel is so hard to turn. what shoul I do? Please help!!! oh and the Temperature needle went all the way to the top. I even added cooling fluid. Help!!! How much does this thing is going to cost me.
Visitor, 2003 Mercedes-Benz S55 AMG, 86,500 mi
Visitor, 2003 Mercedes-Benz S55 AMG, 48,000 mi
Has multiple leaks from some of the hoses located on the driver side
Visitor, 2005 Mercedes-Benz S55 AMG, 58,000 mi
Fluid is leaking from either the reservoir or a hydraulic line, red warning light on the dash is illuminated. Sucks after spending
8 K in other repairs on this car last year. You would think once you get the car almost paid off you could enjoy it for a while
without a continuing large expense. Not happening
Visitor, 2001 Mercedes-Benz S55 AMG, 115,000 mi
ABC Pump failure
Visitor, 2002 Mercedes-Benz S55 AMG, 78,000 mi
The container cap pupped out (or at least that is what I noticed when I looked under the hood) and most of the fluid had shut out all over my drive way, that is after my wife got home!