Dynamic Ride Control (DRC), Draining And Filling: Notes
Extracting, evacuating and filling the whole DRC line (lines/damper and central valve) is performed with the Filling device for DRC system:VAS 6544 Depending on the DRC system equipment in the dealership, the equipment may need to modified or updated to match :VAS 6544 . The following choices are possible:
Special Tools And Workshop Equipment Required
- Upgrade kit, Filling device for DRC system:VAS 6209/4 . The :VAS 6209/4 serves as an upgrade to the charging device for DRC system:VAS 6209 already found in dealerships.
- Retrofit kit, DRC system:VAS 6209/5 . The :VAS 6209/5 is needed if the dealership has the pressure pump:VAS 6209/3 and wants to upgrade the filling device for DRC system:VAS 6544 . The supplement set, DRC system:VAS 6209/6 is also necessary.
- Supplement set, DRC system:VAS 6209/6 . The :VAS 6209/6 is needed up upgrade the already available pressure pump:VAS 6209/3 in the filling device for DRC system:VAS 6544 . The requirement is that the dealership already have the charging device for DRC system:VAS 6209 . If the dealership does have the charging device for DRC system:VAS 6209 , then the retrofit kit, DRC system:VAS 6209/5 must be obtained.
- Charging device for DRC system:VAS 6544
Updating the equipment for the 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 :V.A.S 6544 .
Only approved oil for filling and draining must be used. For this, observe Parts Information.
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 suctioned, 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 on vehicles with the 3-stage damping may be performed only when the damping setting is set to "COMFORT".
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 :VAS 6544 .
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 charging device for DRC system:VAS 6209 .
- Connecting Hose
- From the :VAS 6209
- Charging Device for DRC System:VAS 6544
- Container for Used Oil
- Empty before starting the work.
- Identification: Red dot
Before filling the DRC system, make sure the oil reservoir for the :VAS 6544 and the line between the pressure pump and oil reservoir are filled with oil.
The used oil container on the :VAS 6544 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-.
Fill and bleed the :VAS 6544 .
-- Fill the oil reservoir -2- with new oil up to the marking and position the o-ring to the height of the oil level Parts Information.
-- Close the shut-off valve -A- and -C- on the :VAS 6544 .
-- Close the needle valve -B-.
-- Connect the hose -2- to the old oil reservoir -arrow- and to the quick-release fastener -4- on the :VAS 6544 .
-- 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 1-2 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.
SUCTIONING
Extracting, evacuating and filling the DRC on vehicles with the 3-stage damping may be performed only when the damping setting is set to "comfort".
Always Wear Safety Goggles!
-- Turn the front wheel on the side to be suctioned toward the outside.
-- Remove the dust cap from the front suction/fill valve.
-- Connect the fill line and quick-release fastening -1- from the :VAS 6544 ) DYNAMIC RIDE CONTROL (DRC), DRAINING AND FILLING - Fill Lines with Quick-Release Fastener to the front suction/fill valve on the line to be suctioned.
-- Remove the rear wheel on the side of the line to be suctioned.
-- Free up the wheel housing liner for the rear suction/fill valve.
-- Remove the dust cap from the rear suction/fill valve.
-- Connect the fill line and quick-release fastening -1- from the :VAS 6544 ) DYNAMIC RIDE CONTROL (DRC), DRAINING AND FILLING - Fill Lines with Quick-Release Fastener to the rear suction/fill valve on the line to be suctioned.
-- Connect the fill lines ) DYNAMIC RIDE CONTROL (DRC), DRAINING AND FILLING - Fill Lines with Quick-Release Fastener to the connections -A- and -B- on the :VAS 6544 .
Shut-off valve -A- and -C- on the :VAS 6544 closed.
Needle valve -B- closed.
Hose connected -2- to the old oil reservoir -arrow- and to the :VAS 6544 -4-.
Venturi injector -3- connected to the old oil reservoir vent hose -arrow- on the :VAS 6544 .
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, close the valve -C- and disconnect the compressed air hose from the Venturi injectors.
- Check for leaks.
Vacuum must be stable for at least 2 minutes at negative 0.9 bar.
-- 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 Parts Information.
Extracting, evacuating and filling the DRC on vehicles with the 3-stage damping may be performed only when the damping setting is set to "COMFORT".