Genuine OEM Audi Rear Left Brake Caliper Housing, part number 5G0615423B. This component serves as the main body of the brake caliper, housing the piston and other mechanisms that apply hydraulic pressure to the brake pads. It is positioned on the rear left side of the vehicle's braking system. Weighing approximately 2.686 kg, this housing is engineered for high strength and heat dissipation. Choosing a genuine OEM caliper housing ensures the correct material composition, precise machining for piston movement, and exact mounting points, which are critical for safe, consistent, and reliable braking performance.