DRC System Pressure Checking

WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2015 Audi S7, 2015 Audi RS 7, 2015 Audi A7 Quattro, 2014 Audi S7, and 2014 Audi RS 7. However, it is still accessible from the selected car via links, so may be relevant.

Special Tools And Workshop Equipment Required

DRC Pressure Tester VAS 6209/2
Hand Vacuum Pump VAS 6213

DRC Pressure Tester VAS 6209/2 Bleeding

Use only approved oil for the bleeding procedure .

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 (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 Hand Vacuum Pump 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.

Fig 2: DRC Pressure Tester VAS 6209/2

Courtesy of AUDI OF AMERICA, LLC

-- Remove the cap 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 DRC Pressure Tester VAS 6209/2 increases slowly and takes approximately two minutes. DRC system pressure can only be read when DRC Pressure Tester VAS 6209/2 needle 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 little 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 (4.3 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 value, refer to reference temperature of 20 °C (68 °F)

16 bar (232 psi) = operating pressure
15 bar - 16 bar (218 - 232 psi) = central valve new or as good as new
14 bar -15 bar (203 - (218 psi) = normal range of operation, system OK
< 14 bar (203 psi) = system leaking or not filled completely, air entering system, central valve has no pressure/is empty.