Dynamic Ride Control (DRC), System Pressure Checking

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Special Tools And Workshop Equipment Required

DRC Pressure Tester:VAS6209/2
Hand Vacuum Pump:VAS6213

:VAS6209/2 Bleeding

Use only approved oil for the bleeding procedure.

NOTE:

The charging device :VAS6209/2 must always be bled the first time it is used.

If the charging device :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 special tool as shown in illustration.

Fig 1: Bleeding Pressure Gauge And Line Section

Courtesy of AUDI OF AMERICA, LLC

NOTE:

The illustration shows bleeding process by extracting hydraulic fluid using a :VAS6213 .

-- 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 Dynamic Ride Control (DRC) Line.

Fig 2: Connecting V.A.S 6209/2 And Remove Dust Cap

Courtesy of AUDI OF AMERICA, LLC

-- Remove the cap from the extract/fill valve and connect the :VAS6209/2 .

-- Read the system pressure on the :VAS6209/2 .

Fig 3: Connecting V.A.S 6209/2 And Remove Dust Cap

Courtesy of AUDI OF AMERICA, LLC

NOTE:

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.

Fig 4: Connecting V.A.S 6209/2 And Remove Dust Cap

Courtesy of AUDI OF AMERICA, LLC

NOTE:

A small oil leak at the connection that results from connecting or disconnecting the Dynamic Ride Control (DRC) System pressure tester for Audi RS4 :VAS6209/2 is not critical. Avoid repeating measurements because a small quantity of oil is removed from the system every time the DRC system pressure tester for Audi RS4 :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 belo w minimum pressure or failure.

-- If the pressure is not OK, determine the cause and service the system.

Dynamic Ride Control (DRC) System Pressure Values

Pressure values refer to reference temperature of 20 °C (68 °F).

20 bar (290.07 psi) = operating pressure
19 bar - 20 bar (275.57 - 290.07 psi) = central valve new or as good as new
18 bar - 19 bar (261 - 275.57 psi) = normal range of operation, system OK
< 18 bar (261 bar) = system leaking or not filled completely, air entering system, central valve has no pressure/is empty.