Dynamic Ride Control (DRC) System Pressure, Checking

WARNING: This page is about a different car, the 2021 Audi S4 and 2021 Audi A4 Quattro. However, it is still accessible from the selected car via links, so may be relevant.

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.

NOTE:

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.

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 .

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

-- Disconnect hose -C and D-.

System Pressure Test

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 :VAS6209/2 .

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

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.

NOTE:

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.