BMW 31216793923 Left Carrier

The steering knuckle or 'swivel bearing' is one of the two outboard attachment points for the suspension arms apart from acting as a wheel hub and carrier for the wheel bearing. The wheel bearings are factory sealed and therefore do not need to be serviced. Whereas in the rear drive models, the wheel bearing and hub assembly is just bolted to the steering knuckle, in the xDrive models, it is pressed onto the steering knuckle and requires the use of several special tools for removal. Well, it is different depending on the model, in xDrive models for an example, when you remove the wheel hub the bearing is destroyed and therefore, one needs to use the correct procedure for the model in question.