The Lexus ES350 Control Arm is the pivotal link between the frame of the sedan and its wheels, which allows the wheels to climb over bumps while maintaining precise steering. Acting as the mount for springs, shocks and sway bars, the Control Arm pivots on rubber bushings at the chassis end and either bushings or ball joints at the knuckle end in order to cushion the road forces instead of passing them directly on to passengers. Over the course of the ES350 generations, two main Control Arm styles have appeared. Earlier Lexus cars have depended on stamped steel arms, which are valued for being low cost but tend to rust and become weaker, making bushing or joint service difficult. Newer ES350 versions adopt cast iron or cast aluminum designs, which are resistant to corrosion, lighter and provide additional strength against curb strikes or tow truck mishaps. In the Lexus suspension layout, these are upgrades to the Control Arm that maintain alignment even while driving over harsh roads. Regardless of material, all Lexus Control Arms are durable and service on an ES350 typically focuses on worn bushings or joints unless bending or severe rust necessitates a full replacement. The Control Arm is essential for ensuring a smooth ride.
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