The Lexus RX350 Control Arm is the important hinge that allows each front wheel to move vertically while maintaining rigid alignment with the SUV frame. Acting like a strong link between the chassis and knuckle on Lexus assembly, the Control Arm rotates on rubber bushings at the frame end and on a ball joint at the wheel end. Bumps are absorbed by springs and shocks without being transmitted into the cabin. Stamped steel Control Arm designs dominated early RX350 models, a good idea for cost but subject to rust if road salt piled up. Later, Lexus engineers switched to cast aluminum or iron versions, as they are resistant to corrosion, lighter, and stronger. Regardless of material, all Control Arms support ancillary parts such as sway bars or torsion bars, and a diagonal radius rod prevents fore and aft movement of the wheels in the MacPherson strut layout applied by the RX350. Wear usually manifests itself in bushings or ball joints, but a bent Control Arm can follow a harsh curb strike, so it is important to check your Control Arm components to maintain Lexus ride comfort and RX350 steering precision.
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