Genuine OEM Skoda Main Brake Cylinder Gasket, part number 1J0611243B. This critical O-ring is designed to seal the main brake cylinder, effectively preventing brake fluid leaks and maintaining hydraulic pressure. It forms a tight seal within the main brake cylinder assembly. Made from durable rubber, it is a small component measuring approximately 5 cm in diameter and weighing only 0.0008 kg. Using a genuine OEM gasket ensures the correct material composition and dimensional accuracy, which are vital for long-term sealing performance and brake system reliability.