The Genuine BMW Mini Brake Master Cylinder Grommet (part number 34336799316) is a small rubber grommet designed to fit into the brake master cylinder of BMW Mini vehicles. It serves as a seal between the master cylinder and the brake booster, preventing any leaks or air from entering the system. This grommet is an authentic BMW part, ensuring a perfect fit and reliable performance. It is compatible with various Mini models and is an essential component for maintaining the integrity of the braking system.