Genuine OEM Mercedes-Benz Brake Pad Anti-Rattle Spring, part number A0004213391. This spring is designed to prevent brake pads from rattling within the caliper assembly during operation, ensuring a quiet and smooth braking experience. It is a small but vital component for brake system performance and comfort. Made from high-tensile spring steel for durability. Genuine OEM parts provide the correct tension and material properties for reliable anti-rattle function.