https://www.hoyihe.com/product/audi/b5-b6-front-axle-lower-8e0-407-151-4b3-407-151.htmlAs an integral part of the Audi suspension system, the control arm branch out from the chassis to the wheels, connecting and managing the motion of the wheels in relation to the vehicle's body. This pivotal component is designed to ensure that the wheels remain in contact with the road surface under any conditions, greatly enhancing not only the comfort but also the overall handling and safety of the vehicle.Construction and Design,The control arm, also commonly referred to as an A-arm, is built rugged yet lightweight typically constructed from either cast iron or aluminium. In an Audi vehicle, the control arm composition ensures lesser unsprung weight allowing for a more responsive suspension system. The A-arm design allows for better control of the wheels, effectively managing vertical wheel movement, ensuring optimal tire contact and improving ride quality.