Genuine OEM Volkswagen Brake Caliper Housing, part number 2HJ615123B. This is the main structural component of the brake caliper that houses the pistons and brake pads. It is mounted to the steering knuckle and works with the brake rotor to slow the vehicle. Constructed from durable cast iron or aluminum for heat dissipation and strength. Genuine OEM calipers ensure precise piston movement and optimal braking force.