The Genuine BMW Seal Brake Booster is a high-quality replacement part for the 128i, 135i, and 328i models. This seal is designed to fit perfectly onto the brake booster and ensure a tight and secure seal. It is made from durable materials to withstand the high pressures and temperatures of the braking system. This seal is an essential component for maintaining the proper functioning of the brake system, ensuring safe and reliable braking performance.