The BMW X3 Control Arm is the vital connection that allows each front wheel to have vertical movement while being securely tied to the chassis. Mounted with rubber bushings to the frame on one side and a ball joint to the steering knuckle on the other, this Control Arm has the ability to pivot each time there are bumps or springs pushing the wheel up or down. This ensures that ride comfort and precision of handling are maintained. Earlier versions of the X3 applied stamped steel Control Arm pieces, which were strong but prone to rust. In later iterations, the Control Arm was improved to cast iron or lightweight cast aluminum, which made the SUV more corrosion resistant and allowed it to handle sharper turns due to a reduction in unsprung weight. On the 2011-2017 X3 models, BMW further refined the geometry to reduce tire wear. Although the arm itself will last the life of the BMW in many cases, the arm's bushings and ball joint will wear over time, and severe curb hits can bend the assembly, so full replacement is the safe choice. A damaged Control Arm may also cause misalignment, so every BMW X3 still uses one lower Control Arm on each front corner within the MacPherson strut layout with a separate radius rod to prevent forward or rearward wheel movement.
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