Mercedes-Benz with Active Body Control or ABC have a number of
factors to be concerned with. This system is a completely active hydraulic system driven by a high
pressure pump that also controls power steering.
These systems are prone to leaks and seeps but are overall very reliable with
leaks at the pump being uncommon. The vehicle level is controlled using inputs from four level sensors and
By routing high pressure fluid, delivered through valve blocks, the system
also has nitrogen accumulators for dampening. The valve blocks have valves with metal seats and these can be
prone to leaking if the fluid has fine particles of dirt in it. It may be necessary to flush the system in the
event that valves are suspected of leaking or the ride height changes after shutdown.
This uses several gallons of Pentosin CHF 11S hydraulic fluid. These systems
are complex and diagnosis and testing should be conducted before commencing any
The ABC struts have quick release
connectors, given where they are located corrosion often prevents removal requiring the corresponding hard
lines to be replaced. Never work on these systems when they are pressurized. In many cases they are self
bleeding but several test modes are available for these systems that can be used for diagnostic purposes as
well as insuring bleeding is complete.
Having Problems With Your ABC System Or Questions?
Call (310) 441-1956 For
A Free Diagnostic.
Major work is
backed by one year unlimited mileage guarantee. Minor adjustments and tune-ups carry a six month,
unlimited mileage guarantee. Guarantee covers all parts and labor. Some exceptions apply call for
details (310) 441-1956
Magnuson-Moss Act of 1975 - Federal Law Prohibits
any dealer from implying or denying routine warranty service because scheduled routine maintenance
was performed at an independent facility,
Title 15 Chapter
50 sections 2301-2312 US Federal Code