The Lexus ES300 Steering Knuckle helps to anchor the front wheel hub to suspension and steering linkages in order to turn the sedan precisely and roll smoothly over bumps. On every Lexus ES300, the Steering Knuckle provides a connection point for control arms or strut and lower arm, the tie rod end and hub or spindle to allow vertical movement of the wheel with the road and horizontal movement with the input of the steering wheel. Throughout its life, the ES300 stayed front wheel drive with its common configuration pushing or bolting a bearing hub into the Steering Knuckle, with the axle shaft running through the center. Earlier kingpin designs, which were once very common on trucks, gave way to ball joints that mount in the Lexus Steering Knuckle, which sits low on weight and also helps to make the steering lighter and easier to move. Because the Lexus ES300 Steering Knuckle rarely wears out, the knuckle is usually only replaced if it is damaged in a collision or distorted bores prevent ball joints or tie rod studs from seating securely.
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