Genuine OEM Mercedes-Benz Brake Bleed Valve, part number A0004209455. This valve is essential for allowing the removal of air from the brake hydraulic system, which is critical for maintaining proper braking function. It is typically located on the brake caliper assembly. The valve is designed with precise threading and sealing to prevent leaks while allowing for effective bleeding. Genuine OEM brake bleed valves ensure the correct material composition and sealing properties for safe and reliable brake system maintenance.