Dynamic Ride Control (DRC) System Pressure, Checking
Special tools and workshop equipment required
- DRC Pressure Tester :VAS6209/2
- Hand Vacuum Pump :VAS6213
DRC Pressure Tester :VAS6209/2 , Bleeding
Use only approved oil for the bleeding procedure. Refer to the Parts Information.
The :VAS6209/2 must always be bled the first time it is used.
If the :VAS6209/2 still shows a residual pressure greater than 0.5 bar (7.2 psi) (for example, from a previous reading), bleeding must not be done.
-- To bleed pressure gauge -B- and line section -A-, install the special tool as shown.
The illustration shows bleeding process by extracting hydraulic fluid using a :VAS6213 .
-- The bleeding procedure must be performed until air bubbles are no longer visible in hose -C-.
-- Disconnect hose -C and D-.
System Pressure Test
System pressure check is performed on front shock absorber of corresponding DRC line.
-- Remove the cap -arrow- from the extract/fill valve and connect the :VAS6209/2 .
-- Read the system pressure on the :VAS6209/2 .
The pressure on the :VAS6209/2 increases slowly and takes approximately two minutes. The DRC system pressure can only be read when the needle on the :VAS6209/2 has finally come to a stop.
-- Disconnect the :VAS6209/2 and install the dust cap.
A small oil leak at the connection that results from connecting or disconnecting the charging device :VAS6209/2 is not critical. Multiple measurements should be avoided since the system loses a small amount of oil each time the :VAS6209/2 is connected. Every connection results in a pressure decrease of approximately 0.3 bar (4.35 psi) from the previous reading. Multiple repeated measurements decrease system pressure below minimum pressure or failure.
-- If the pressure is not OK, determine the cause and service the system.
DRC System Pressure Values
Pressure values refer to reference temperature of 20 °C (68 °F).
- 16 bar (232.06 psi) = operating pressure
- 15 bar - 16 bar (217.55 - 232.06 psi) = central valve new or as good as new
- 14 - 15 bar (203.05 to 217.55 psi) = normal range of operation, system OK
- < 14 bar (203.05 psi) = system leaking or not filled completely, air entering system, central valve has no pressure/is empty.