A vehicle with a significantly worn ball joint should not be driven. If the ball joint fails completely, the control arm can detach from the steering knuckle, meaning you will lose control of the car.
A car with a ball joint that is just starting to wear out can be driven, but as the wear increases, so do the chances of premature tire wear and poor handling. If you suspect that a ball joint is beginning to wear, have a technician evaluate the problem as soon as possible.
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