Component Tests and General Diagnostics

Dynamic Ride Control System Pressure Test

Special tools, testers and auxiliary items required

• Charging device (V.A.S 6209/2)

• Hand vacuum pump (VAS 6213)

Bleed charging device (V.A.S 6209/2)

Use only approved oil for the bleeding procedure. Refer to the Electronic Parts Catalog (ETKA).

• Charging device (V.A.S 6209/2) must always be bled at initial use.

• If charging device (V.A.S 6209/2) still shows a residual pressure greater than 0.5 bar (e.g. from a previous reading), bleeding must not be done.

- To bleed pressure gauge - B - and line section - A -, install special tool as shown in illustration.






• Illustration shows bleeding process by extracting hydraulic oil with (VAS 6213)

- Bleed process must be performed until air bubbles are no longer visible in hose - C -.

- Disconnect hose - C - and - D - and perform system pressure check.

System pressure check is performed on front shock absorber of corresponding DRC line.






- Remove the cap from the extract/fill valve and connect the (V.A.S 6209/2).

- Read system pressure at (V.A.S 6209/2).






• Pressure increase at (V.A.S 6209/2) occurs slowly and takes approximately 2 minutes. DRC system pressure can only be read when (V.A.S 6209/2) needle has finally come to a stop.

- Disconnect (V.A.S 6209/2) and install dust cap.






• Small oil leak which results from connecting or disconnected (V.A.S 6209/2) at connection is not critical. Avoid repeating measurements because a small quantity of oil is removed from the system every time the (V.A.S 6209/2) is connected. Every connection results in a pressure decrease of approximately 0.3 bar 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).

• 20 bar (290 PSI) = operating pressure

• 19 - 20 bar (276 - 290 PSI) = central valve new or as good as new.

• 18 - 19 bar (261 - 276 PSI) = normal range of operation, system OK.

• < 18 bar (261 PSI) = system leaking or not filled completely, air entering system, central valve has no pressure/is empty.