Inboard brake
An inboard brake is an automobile brake mounted on the chassis of the vehicle, rather than directly on a wheel hub. It began with drum brakes and evolved to disks, and creates a reduction in the unsprung mass (by relocating the brake discs and calipers from the wheel hubs to rear drive components). It also improves brake performance by applying its force directly to the chassis, rather than being transferred to it through the suspension arms.