Genuine OEM Mercedes-Benz Brake Liquid Tank Cap, part number A0004319087. This cap is essential for sealing the brake fluid reservoir, preventing moisture ingress, contamination, and fluid evaporation. A properly sealed reservoir is crucial for maintaining the hydraulic integrity of the braking system. The use of genuine OEM ensures a perfect fit and seal, safeguarding the brake fluid's condition and performance. This component is vital for the reliable operation of your brakes.