Suspension: Service and Repair
Bleeding the Off-Road Stabilizer System (ORS)Procedure for bleeding
The Off-road Stabilizer System (ORS) must be bled when the system was opened (e.g., after removing the front and/or the rear axle, or after replacing spare parts for the system). Both stabilizers are bled at the same time when it is done.
WARNING: The Off-road Stabilizer System (ORS) operates at an overpressure of up to 165 bar. Under certain conditions, motions can occur on the wheel carrier (e.g., if the Off-road stabilizers are disengaged when lifting, the button is pressed on the centre console, and the wheel carrier is also raised).
^ The stabilizer can close quickly. Thus there is the danger of crushing in the area of the stabilizers and wheel carriers.
-> Before working on the vehicle, ensure that the ORS is engaged. The indicator light on the centre console button must be OFF . If the indicator light is on, follow the following procedure: Switch on the ignition and engage the road driving program &get;> High Range <<. The stabilizers must audibly engage.
-> Before working on the ORS, depressurize the system. To do this, close the Porsche System Tester and select in the menu >> Off-road Stabi (ORS) >> Drive links >> clock valve VA or valve HA <<. The valve clocks (audibly) until the procedure is finished.
-> Wear protective gloves and goggles.
Note: The driving programs can be selected using the rocker switch on centre console. The -arrow- on the indicator light displays if the road driving program >> High Range << (light OFF) or the off road program >> Low Range << (light ON) disengaged.
Front stabilizer, operator control unit
1. Connect the bleeder valves of the actuator to the front axle with a suitable transparent hose and open approximately one turn.
2. Connect the bleeder valves of the actuator to the rear axle with a suitable transparent hose and open approximately one turn.
3. To prevent the hoses from slipping from the bleeder valves, they must be fastened using screw-type hose clamps/tie wraps. Because of the high pressure occurring, they can become loose during the bleeding process.
4. Fill with Pentosin CHF 11S in the opening of the dipstick -arrow-. The opening is located at the left rear, in the centre of the D-pillar.
5. Pull out the dipstick and fill with Pentosin CHF 11S using suitable filling equipment.
6. Fill with Pentosin CHF 11S up to the Max. marking of the dipstick.
Note:
^ Connect the Porsche System Tester and switch on the hydraulic pump in the menu >> Off-road Stabi (ORS) >> Drive links >> Switch on electrical hydraulic pump <<.
^ Only allow the hydraulic pump to run for max. 10 seconds when switching it on for the first time following repairs.
Switch on the ignition, press the brake pedal, and engage High Range. Connect the Porsche System Tester and switch on the hydraulic pump for 10 seconds. The Pentosin CHF 11S is pumped through the lines.
Switch off the hydraulic pump. Check the fluid levels on the oil dipstick and top up to the Max.marking.
Switch on the hydraulic pump the 2nd time for 10 seconds. The Pentosin CHF 11S is pumped through the lines.
Switch off the hydraulic pump. Check the fluid levels on the oil dipstick and top up to the Max.marking.
Switch on the hydraulic pump the 3rd time. The Pentosin CHF 11S is pumped through the lines. Perform a visual inspection of the front and rear axle for lack of air bubbles.
Let the hydraulic pump run until air bubbles can no longer be seen on the hoses of the actuators. Let the hydraulic pump run for approximately an additional 1 minute. Only then it is ensured that the return line is also completely rinsed out.
Switch off the hydraulic pump. Check the fluid levels on the oil dipstick and if necessary, top up to the Max.marking.
Disconnect the Porsche System Tester, switch off the ignition, and close the bleeder valves of the actuators. Remove the hoses. To protect the bleeder valves, attach the protective caps.
Checking operation
Note: After pressing the button on the centre console, the hydraulic pump starts (audibly). The stabilizers disengage or engage when a specific overpressure has been reached in the system. A time delay between activation until disengaging/engaging (audible) is normal.
Switch on the ignition, press the brake pedal, and engage Low Range. To do this, briefly press the rocker switch-direction arrow-forwards. The indicator light -arrow- co meson.
The stabilizers disengage. In other words: Press the button on the centre console. The button light-arrow- comes on.
In the instrument cluster (tachometer) the indicator light is on and the stabilizers disengage audibly.
Press the button again. The button light-arrow- goes out. The stabilizers engage again audibly and the indicator light in the instrument cluster goes off.