Dynamic Ride Control (DRC), System Draining And Filling: Notes
Special Tools And Workshop Equipment Required
- DRC Filling Device:VAS6209/4 serves as an upgrade to DRC Charging Device:VAS6209
- Retrofit Kit, DRC System:VAS6209/5 is needed if dealership has DRC Charging Device, Pressure Pump:VAS6209/3 and wants to upgrade Filling Device for DRC System:VAS6544
- Supplement Kit, DRC System:VAS6209/6 is needed to upgrade DRC Charging Device, Pressure Pump:VAS6209/3 to Filling Device for DRC System:VAS6544 . Requirement is that dealership already has DRC Charging Device:VAS6209 and Retrofit Kit, DRC System:VAS6209/5 must also be obtained.
- DRC Filling Device:VAS6544
Extracting, evacuating and filling the whole Dynamic Ride Control (DRC) System line (lines/damper and central valve) is performed with the :VAS6544 . Depending on the Dynamic Ride Control (DRC) System equipment in the dealership, the equipment may need to modified or updated to match the DRC Filling Device:VAS6544 . The following choices are possible:
Updating the equipment for the Dynamic Ride Control (DRC) System must be done one time only. It is not necessary to convert back again. The procedure for draining and filling the complete DRC system is described using the :VAS6544 .
Only approved oil for filling and draining must be used.
As a replacement part, shock absorbers and lines are delivered empty.
Filling must only be performed at ambient temperature of approximately 20° C (68 °F).
Lines/dampers and central valves may only be evacuated and filled when they are installed and connected.
The shut-off valve for the wiring harness at the central valve must remain open when extracting, evacuating and filling the DRC system (lines/damper and central valve).
Extracting, Evacuating And Filling The DRC Line On Vehicles With Variable Damping May Be Performed Only When The Damping Setting Is Set To "COMFORT" Mode.
To extract, evacuate and fill the DRC line, start the Fill DRC >>Function << on the Vehicle Diagnostic Tester under address word 14 in "Guided Functions ".
If the mode is activated, the system goes into "COMFORT" mode and can no longer be changed manually. The yellow indicator lamp in the instrument cluster turns on when filling mode is active.
While filling the DRC system, the gas reservoir to the pressure clamps is automatically checked for leaks at the piston in the central valve.
Always Wear Safety Goggles!
Valves of filling device are open when ratchet levers are parallel to direction of flow.
The valves must be kept closed during transport and storing the :VAS6544 .
Lines must not be bent.
Required Equipment
- Front Shock Absorber Adapter
- Not for this model
- Rear Shock Absorber Adapter
- Not for this model
- Fill Lines with Quick-Release Fastener
- Venturi Injector with Exhaust Hose
- From the DRC Charging Device:VAS6209
- Connecting Hose
- From the DRC Charging Device:VAS6209
- DRC Filling Device:VAS6544
- Container for Used Oil
- Empty before starting the work
- Identification: red dot
Before filling the DRC system, make sure the oil reservoir for the :VAS6544 and the line between the pressure pump and oil reservoir are filled with oil.
The used oil container on the :VAS6544 must be empty and must be emptied after each charge.
Drain the Old Oil Reservoir.
-- Remove the cap -arrow- from the old oil reservoir -1- and drain the old oil.
-- Install the cap -arrow- on the old oil reservoir -1-.
:VAS6544 Filling and Bleeding
-- Fill the oil reservoir -2- with new oil up to the marking and position the O-ring to the height of the oil level.
-- Close the shut-off valve -A and C- on the :VAS6544 .
-- Close the needle valve -B-.
-- Connect the hose -2- to the old oil reservoir -arrow- and to the quick-release fastener -4- on the :VAS6544 .
-- Connect the Venturi injector -3- and vent hose to the old oil reservoir -arrow- as illustrated.
-- Connect the compressed air to the Venturi injector -3-.
-- Open the locking valve -C-.
-- Open the locking valve -A- briefly, for approximately one to two seconds, until the connecting line -1- between the oil reservoir -2- and pressure pump is filled and does not contain bubbles.
-- Close the locking valve -C-. Remove the compressed air connector form the Venturi injector.
EXTRACTING/EVACUATING
Extracting, Evacuating And Filling The DRC Line On Vehicles With Variable Damping May Be Performed Only When The Damping Setting Is Set To "COMFORT" Mode.
To extract, evacuate and fill the DRC line, start the Fill DRC >>Function << on the Vehicle Diagnostic Tester under address word 14 in "Guided Functions ".
If the mode is activated, the system goes into "COMFORT" mode and can no longer be changed manually. The yellow indicator lamp in the instrument cluster turns on when filling mode is active.
Always Wear Safety Goggles!
-- In vehicles with variable damping, start the Fill DRC >>Function << on the Vehicle Diagnostic Tester under address word 14 in "Guided Functions ".
-- Turn the front wheel on the side to be evacuated toward the outside.
-- Remove the dust cap from the front evacuation/fill valve.
-- Connect the fill line and quick-release fastener -1- from the Charging Device For DRC System:VAS6544 . Refer to -item ) DYNAMIC RIDE CONTROL (DRC), SYSTEM DRAINING AND FILLING - Fill Lines with Quick-Release Fastener to the front evacuation/fill valve on the line to be evacuated.
-- Remove the rear wheel on the side of the line to be evacuated.
-- Free up the wheel housing liner for the rear evacuation/fill valve.
-- Remove the dust cap from the rear evacuation/fill valve.
-- Connect the fill line and quick-release fastener -1- from the :VAS6544 . Refer to -item ) DYNAMIC RIDE CONTROL (DRC), SYSTEM DRAINING AND FILLING - Fill Lines with Quick-Release Fastener to the rear evacuation/fill valve on the line to be evacuated.
-- Connect the fill lines. Refer to -item ) DYNAMIC RIDE CONTROL (DRC), SYSTEM DRAINING AND FILLING - Fill Lines with Quick-Release Fastener to the connections -A and B- on the :VAS6544 .
The shut-off valve -A and C- on the :VAS6544 closed.
Needle valve -B- closed.
The hose -2- is connected to the used oil container -arrow- and to the :VAS6544 -4-.
Venturi injector -3- connected to the old oil reservoir vent hose -arrow- on the :VAS6544 .
Compressed air to the Venturi injector -3- connected.
-- Open the valve -C- until the last of the oil is extracted from the DRC system. (Visible on the return hose -2- to the used oil reservoir).
-- When the pressure manometer shows approximately negative 0.9 bar (13.05 psi), close the valve -C- and disconnect the compressed air hose from the Venturi injectors.
- Check for leaks.
Vacuum must be stable for at least two minutes at negative 0.9 bar (13.05 psi).
-- Check the oil level on the oil reservoir, fill with new oil up to the marking if necessary and position the O-ring to the height of the oil level.