The Genuine BMW Brake Booster Seal - 34336857618 is a rubber seal designed to fit into the brake booster of BMW vehicles. The brake booster is a component of the braking system that helps increase the force applied to the brake pedal, making it easier to stop the vehicle. This seal helps to prevent air leaks and maintain proper pressure within the brake booster, ensuring efficient braking performance. It is a genuine BMW product, meaning it is made to the exact specifications and quality standards of the original part used in BMW vehicles. This brake booster seal is an essential component for maintaining the safety and performance of your BMW's braking system.