The Lexus ES350 Steering Knuckle allows the front wheels to pivot smoothly and yet remain firmly connected to suspension and steering components. It anchors control arms or a strut to tie rod ends and supports the hub or spindle so that the wheel can move up over bumps and turn left or right without wobble. In early days, kingpins provided this rotation, but now modern ball joints that are fitted to every single one of the Lexus sedans cut weight and simplify alignment. Front wheel drive ES350 versions use a hub pressed into the Steering Knuckle with the drive axle passing through, while older rear drive layouts present on other Lexus platforms featured an integral spindle on tapered roller bearings. Two basic styles persist with one spindle type for non-driven wheels and hub type for driven wheels with the ES350 always relying on the latter to combine propulsion and steering functions. Impacts or deformed ball joint tapers are the major reasons one replaces a Steering Knuckle, but typically they will last the life of a Lexus ES350. Depending on the type of vehicle, regular checking of stud seats and bearing threads helps to ensure that the Steering Knuckle remains true. When necessary, fitting a new Steering Knuckle gives your car straight tracking and tight handling.
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