4301IN Bleeding and filling the levelling system
WM 4301IN Bleeding and filling the levelling system
Tools
Technical values
Bleeding and filling the levelling system
Notes on handling vehicles with a drained air spring system when operating in the workshop
Information
Vehicles that have been raised in transport mode must not be moved in manoeuvring and driving mode.
- Vehicles that have been raised in transport mode and whose air suspension system has been bled can be filled again by starting the engine and leaving the engine running without interruption for at least 10 minutes (switch on exhaust-gas extraction system!).
- Transport mode can be switched off using the Porsche System Tester.
Information
Vehicles that have been raised with the air spring system drained must not be moved in manoeuvring or driving mode.
- In other words, raised vehicles with a drained air spring system must not be placed on their wheels and moved.
- Brief manoeuvring is permitted provided the vehicle has NOT been raised in the meantime.
- Vehicles that come into the workshop with a defective or empty/partly empty air suspension system must be refilled again as required (nitrogen compressed-gas bottle) after raising the vehicle, depending on symptoms. This prevents damage to the air-spring struts on the vehicle, which are not defective.
- If the vehicle has been driven with one or more empty air springs, these air springs must be replaced.
- Raising a vehicle with empty air springs creates a vacuum in these air springs. The air spring bellows may develop creases after the vehicle has been set back down on the floor and this may result in the premature failure of the air springs.
- Absolute cleanliness is essential when working on air spring systems.
The following process is only for setting down on the wheels and then manoeuvring the vehicle
If the fault has been located after reading out the fault memory and any troubleshooting according to the troubleshooting guide (for faults that are not obvious) -> 430149 Troubleshooting the levelling system 430149 Troubleshooting the Levelling System, proceed as follows:
1. Detach the air lines for the intact air-spring struts at the valve unit. The valve unit for the levelling system is fitted on the left side, behind the rear axle, at the luggage compartment recess. -> 4301IN Location of air suspension components 4301IN Position of air suspension components
2. Connect the adapter 9825 (valve) to each intact air spring.
3. Connecting line 9825/1 must be connected to the compressed gas bottle of nitrogen and the corresponding pressure reducer unit and pressure gauge (the adapter is shown fitted to the front right spring strut).
Screwing in special tool
4. Fill each intact air spring to=> Pressure: +7 bar+1 bar. Connecting line 9825/1 and compressed gas bottle of nitrogen are then removed. It is now possible to manoeuvre the vehicle in the workshop.
After completing this work, follow the instructions in the section entitled Bleeding and filling multiple components and/or the pressure accumulator.
Bleeding and filling an air spring
Bleeding an air spring without any loss of system air
This function is used for bleeding when working on an air spring or the lines for an air spring. The air from one air-spring strut is the most that can be accommodated in the pressure accumulator.
Switch off the levelling system:
- Switch on ignition.
- Press the high-level button for at least => Time: +10 s.
1. Raise the vehicle. -> 4X00IN Lifting the vehicle Service and Repair
2. Select >> Levelling system/PASM[]]]Maintenance/repairs[[]]Replacement of an air spring[[ in the control unit overview. Select the relevant air spring and then select ]]Bleed[[. Follow the instructions on the Porsche System Tester.
3. After completing repairs, select >>Levelling system/PASM[[]]Maintenance/repairs[[]]Replacement of an air spring[[ in the control unit overview and then select ]]Fill[[. Follow the instructions on the Porsche System Tester.
Bleeding and filling multiple components and/or the pressure accumulator
Bleeding multiple components and/or the pressure accumulator with partial loss of system air
This function is used for bleeding when working on the system and/or the pressure accumulator. Some of the system air is lost in the process.
1. Select >>Levelling system/PASM[[]]Maintenance/repairs[[]]Replacement of several components or replacement of the pressure accumulator[[ in the control unit overview and then select ]]Bleed[[. Follow the instructions on the Porsche System Tester.
2. After completing repairs, select >>Levelling system/PASM[[]]Maintenance/repairs[[]]Replacement of several components or replacement of the pressure accumulator[[ in the control unit overview and then select ]]Fill[[. Follow the instructions on the Porsche System Tester. Refer to the section on "Filling" below!
Information
Filling
Information
Only nitrogen 5.0 may be used for filling the air suspension system.
- Use a compressed gas bottle with a corresponding pressure reducer unit and pressure gauge.
- Fill the air spring system to at least => Pressure: +16 bar+1 bar.
- Fill the air spring system to at most => Pressure: 17 bar
- Wheels must be suspended freely.
- Switch on ignition.
- Adapter 9825 and connecting line 9825/1 must be used.
- When carrying out repairs on the rear axle, use centring aids 9828 to install the air springs if necessary.
- Observe correct tightening torques. -> 4301TW Tightening torques 430115 Calibrating the levelling system 4301IN Position of air suspension components 430149 Troubleshooting the Levelling System
The air spring system is filled from the front right air line. After filling has been completed using the compressed gas bottle of nitrogen, the front right air-spring strut is filled from the pressure accumulator.
Tool
Tool for filling and bleeding air springs
1. Remove front right design cover above spring-strut dome and detach the line for the air-spring strut -2- at the front right.
Detaching and securing air spring line
1.1. Adapter 9825 -1- and connecting line 9825/1 must be connected to the compressed gas bottle of nitrogen and the corresponding pressure reducer unit and pressure gauge.
Screwing in special tool
1.2. Open the compressed gas bottle and set the => Pressure: 17 bar max. (shown as an example)
Pressure of max. 17 bar (shown as an example)
2. Connect Porsche System Tester and select ]]Levelling system/PASM]]Maintenance/repairs[[]]Replacement of several components or replacement of the pressure accumulator]] in the control unit overview and then select ]]Fill[[. Follow the instructions on the Porsche System Tester.
3. Fit front right air line. ]]Fill[[ process must be completed. Follow the instructions on the Porsche System Tester.
4. Fit front right design cover over the spring strut dome.