Genuine OEM Citroen Brake Servo Gasket, part number 9844693480. This gasket is essential for creating a vacuum-tight seal between the brake master cylinder and the brake booster, which is critical for the power-assisted braking system. It is positioned at the connection point where the master cylinder mounts to the brake servo unit. This small but vital component is made from a durable, resilient material. Using a genuine OEM gasket ensures the correct material properties and precise dimensions to maintain vacuum integrity and reliable brake performance.