Dynamic Ride Control (DRC) System Pressure, Checking

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Special tools and workshop equipment required

DRC Pressure Tester :VAS 6209/2 , not illustrated
Hand Vacuum Pump :VAS 6213

Fig 1: Hand Vacuum Pump VAS 6213
Courtesy of AUDI OF AMERICA, LLC

DRC Pressure Tester :VAS 6209/2 , Bleeding

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

NOTE:

The DRC Pressure Tester :VAS 6209/2 must always be bled the first time it is used.

If the DRC Pressure Tester :VAS 6209/2 still shows a residual pressure greater than 0.5 bar (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.

Fig 2: Bleeding Pressure Gauge And Line Section

Courtesy of AUDI OF AMERICA, LLC

NOTE:

The illustration above shows the bleeding procedure by extracting hydraulic fluid using a Hand Vacuum Pump :VAS 6213 .

-- The bleeding procedure must be performed until air bubbles are no longer visible in hose -C-.

-- Disconnect hose -C- and -D-.

System Pressure Test

Fig 3: Identifying Cap & Extract/Fill Valve

Courtesy of AUDI OF AMERICA, LLC

NOTE:

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 DRC Pressure Tester :VAS 6209/2 .

-- Read the system pressure on the DRC Pressure Tester :VAS 6209/2 .

NOTE:

The pressure on the DRC Pressure Tester :VAS 6209/2 increases slowly and takes approximately two minutes. The DRC system pressure can only be read when the needle on the DRC Pressure Tester :VAS 6209/2 has finally come to a stop.

-- Disconnect the DRC Pressure Tester :VAS 6209/2 and install the dust cap.

NOTE:

A small oil leak at the connection that results from connecting or disconnecting the DRC Pressure Tester :VAS 6209/2 is not critical. Multiple measurements should be avoided since the system loses a small amount of oil each time the DRC Pressure Tester :VAS 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.

16 bar = operating pressure
15 bar to 16 bar = central valve new or as good as new
14 to 15 bar = normal range of operation, system OK
Less than 14 bar = system leaking or not filled completely, air entering system, central valve has no pressure/is empty.