RS 6 V8-4.2L Turbo (BCY) (2003)
Suspension Strut / Shock Absorber: Customer Interest
Suspension - DRC Shock Absorber Leak After Replacement
40 Shock absorber leaks after repair on DRC system
40 10 07
2023147/1
May 24, 2010
Affected Vehicles
Condition
A few miles after a repair on the DRC system (e.g. shock absorber replacement), a shock absorber leaks. The upper cap with seal may separate.
Technical Background
The oil pressure created during spring movement cannot be compensated in the central valve.
Possible causes are:
Connection of pressure pipes not correct:
The pressure pipe connectors were not correctly fastened. As a result, the non-return valves in the connectors do not open or open incompletely. A
narrowed pipe restricts the oil flow.
The DRC system was overfilled during service
The DRC system pressure must be adjusted down to 16 bar at the end of filling, otherwise the central valve cannot work correctly. If the system is
adjusted to a pressure of more than 16 bar at the end of filling, excess pressure during spring movement will damage the damper or the central valve.
Tip: This problem can be prevented by verifying the correct system pressure according to the directions in ElsaWeb. (See Repair Manual >> Chassis >>
Suspension, Wheels, Steering >> 43 Self-Leveling Suspension >> Diagnosis and Testing >> Dynamic Ride Control, Checking System Pressure.)
Central valve faulty:
You can determine if the gas reservoir in the central valve has a reduced charge during filling by monitoring the increase of pressure during filling with
the hand pump. The pressure should rise steadily and consistently during filling. A sharp increase that spikes and holds the gauge needle beyond the scale
may indicate the central valve has a reduced charge.