Genuine OEM Audi Fixed Brake Caliper, part number 420615407L. This caliper assembly is designed to hold the brake pads and apply pressure to the brake rotor when the brakes are applied. It is located on the front or rear axle, depending on the specific vehicle assembly. The caliper is a critical component of the braking system, ensuring consistent and reliable stopping power. Genuine OEM calipers are manufactured to exact specifications for optimal performance and longevity.