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Ball joints are a part of your vehicle's suspension system that connect the steering knuckles to the control arms. A ball joint is essentially a flexible ball and socket that allows the suspension to move and, at the same time, the wheels to steer. Cars and trucks will have multiple ball joint assemblies depending on their type of suspension system. Like any other suspension component, ball joints will eventually wear out and become loose. Excessive play in the joint can affect wheel alignment and tire wear. Loose joints can also cause suspension noise (typically a "clunking" sound when going over a bump). If a ball joint fails, the suspension can collapse, causing a loss of control of the vehicle.