The Volkswagen Passat Control Arm is the link in the suspension that allows the front wheels to be raised and lowered in a smooth manner with the tires facing straight ahead. Located between the chassis and the steering knuckle, it swings on rubber bushings at the frame end and a ball joint at the wheel end; thus, bumps cause the wheel to move up and down rather than pushing it backward. Depending on the suspension, some have a single Control Arm on each wheel, others mount an upper wishbone with a lower radius rod, but in all cases, the arm is in contact with springs, shocks, or sway bars and directs their forces into the frame. The first generations of sedans were stamped steel arms, as they were cheap and robust, but could be corroded and were also restricted in stiffness by their shape. Subsequent Volkswagen vehicles added either cast iron or, on lightweight models, cast aluminum rust-resistant arms that help reduce weight and also improve curb impact absorption which became evident in the B6 and beyond Passat models. When one of the Volkswagen vehicles hits a pothole hard enough to dent it, any such arm would go out of shape, and steering becomes difficult or almost impossible to straighten. The wear normally begins at the bushings or ball joint and therefore can be detected through a routine check before the arm itself has to be replaced. Nevertheless, replacing a broken Control Arm will recover handling accuracy and maintain the suspension geometry that Volkswagen wanted.
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