WM 405719 Removing And Installing Front Wheel Bearing (All Models): Information

Information 

The wheel bearings adopt the function of the former ABS pulse rings. They are fitted with a so-called multiple seal. This is a seal with a magnetized layer, which generates the torque impulses for the ABS RPM sensors.

The multiple seal must not come into contact with highly magnetic parts. During installation, make sure that the magnetic side is facing the ABS sensor. Use test card 147-2 for this. 

Fig 1: Identifying Wheel Bearing Components

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

1. Wheel hub
2. Four M8 screws
3. Cover for wheel bearing
4. Wheel bearing (the magnetic side must be facing the ABS sensor)