BMW Genuine Rear Brake Disc Back Protection Plate

Brake protection plate for vehicles manufactured up to November 2012.
Brakes are the most important safety component of the vehicle and for this reason must satisfy the extremely high requirements - legal guidelines as well as BMW high quality requirements.

This includes not only the most rigorous on-road tests and computer simulations but also the checking of all elements and data for deviations - even after the beginning of series production.
All Genuine BMW Brake components are specifically matched to the respective model-specific aerodynamics in interaction with the other model-dependent factors such as the ABS, the body, the chassis and the engine.

Represented by part number 3 in the diagram.