Bleeding the ABD circuit
- Preliminary work: Bleed brakes by conventional method. Refer to BLEEDING BRAKES - VEHICLES WITH ABS AND ABS/TC .
- The bleeding unit remains connected (switched on) when the ABD circuit is being bled. Bleeding pressure approximately 1.5...2.0 bar.
- Connect the Porsche System Tester 2 to the diagnostic socket. The diagnostic socket is located in the driver's footwell (left-hand drive vehicles) or passenger's footwell (right-hand drive vehicles) near the fuse box. Switch on the ignition. Select the "Bleed" menu in the ABS/TC system.
- Open the rear right bleeder valve (use collection bottle).
- Press the Start key on the System Tester. This initiates certain functions in the hydraulic control unit (return pump, outlet solenoid valve and switch-over solenoid valve are activated).
Bleed the system until the brake fluid emerges without bubbles.
In addition (during the entire bleeding process), fully depress the brake pedal to the stop (pump) at least ten times.
IMPORTANT: Double the number of pumping cycles for vehicles with extremely high mileage or for very old vehicles, and use only half of the master brake cylinder stroke (damage could be caused to the master brake cylinder / primary boots). - Close the right rear bleeder valve. Then immediately press Stop key on the System Tester.
- Switch off the ignition and disconnect the System Tester.
- Switch off and disconnect the bleeding unit. Correct the brake fluid level if necessary.