Ball joints are vital components of a car’s chassis and suspension system, and are subject to wear over the life of a vehicle. To put it simply, ball joints are used to allow the front wheels and tires to pivot on a vertical axis as you turn the steering wheel one way or the other. Believe it or not, you’re body has built in ball joints as well. Just think of your legs and arms. One end of your arms and legs have a ball of sorts, that sits within the cups of your hips and shoulders. Even this are subject to wear, as sometimes humans have to undergo shoulder or hip replacement. The same idea carries over to the cars that you see on the road today.