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I think that you are talking about what is called the A arms. They are usually part of the front suspension on a rear wheel drive, and can be in the rear, on a front wheel drive vehicle. They're function is to support the wheel spindle assembly, which is what the wheel bolts to. Each side has two, an upper, and a lower. They are usually on an ecentric, or use a shim type system to position the camber of the wheel, which is whether the top of the tire sticks out, or is pulled in. They also control the caster of the wheel, as well, which is the angle of the spindle, either forward, or back. These settings are a whole nother article to explain, but, basically, these settings determine if a car goes strait down the road, or not, and have a big influence on tire wear. The outsides are wearing that could be a camber issue, or a toe issue, or even a tire pressure issue. If your vehicle when you take your hands off off the wheel attempts to change lanes, or, perhaps, even area codes, this is an alignment issue, most likely.

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15y ago

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