911 Carrera 4 Cabriolet AWD F6-3600cc 3.6L SOHC (1990)
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Switch on ignition and tester. Select vehicle type and then the system PDAS. Go into the drive link menu.
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Select the item "Bleeding" in the drive link menu. Open the bleeder valve on the transverse lock cylinder and remove brake fluid after pressing
the start key indicated by the tester.
Continue bleeding until brake fluid free of air bubbles emerges (max. 300 cubic cm). Press the stop key and close the bleeder valve.
Change to pressure reduction position with the tester.
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Fill with the new brake fluid (depending on quantity removed).
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Then operate the solenoid valve again with the system tester 9288 (in the drive link menu/item "Bleeding") and also remove brake fluid at the
bleeder valve of the longitudinal lock cylinder until the fluid is free of air bubbles (remove max. 300 cubic cm).
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Disconnect the system tester and correct the brake fluid level. Do not fill over the "max. marking" under any circumstances.
Further 3: (Bleeding the lock or brake booster circuit)
Information
Bleeding is divided into three steps. The first step can be omitted where appropriate.
1st step:
Preparatory measures for first assembly or re-installation
2nd step:
Bleeding the pressure accumulator and the valve block
3rd step:
Bleeding the lock cylinders and pressure lines (refer to Further to 2: (Bleeding the lock cylinders and pressure lines))
In the case of replacement or removal of the pump assembly, pressure accumulator and valve block, these instructions (procedures) must be observed
exactly. If a different procedure is followed, heavy foaming of the brake fluid may occur.
When working on the booster circuit (for removal and installation of corresponding parts), first depressurize this circuit. To do this,
disconnect the electrical plug on the pressure pump (pump assembly) and then operate the brake pedal approx. 25 times.
To remove and plug in the electrical plug, press in the center on the plug locking clip.
Preparatory measures for first assembly or reinstallation
This work step (1st step) is required only in the event of replacement or re-installation of the pump assembly, pressure accumulator and valve block.
In addition, it is also necessary if the suction line has been opened or if the fluid reservoir was previously empty. Otherwise, start with the 2nd step.
(Bleeding the pressure accumulator and the valve block).
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Ensure that the electrical plug at the pressure pump (pump assembly) has been disconnected.
