Bleeding The Hydraulic Unit
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2018 Porsche Cayenne, 2017 Porsche Cayenne, 2016 Porsche Cayenne, 2015 Porsche Cayenne, and 2014 Porsche Cayenne. However, it is still accessible from the selected car via links, so may be relevant.
If the hydraulic unit was removed (e.g. after an accident) or if the hydraulic unit was replaced, it must be bled using the Porsche System Tester. This procedure removes any air from the system.
Connect the Porsche System Tester to the vehicle. >>Bleeding the brake system (and replacing hydraulic unit)<< → 470107 BLEEDING THE BRAKE SYSTEM