Ball joints are a common and vital suspension part of the modern vehicle. They're a round bearing in a socket that connects the car's control/suspension arms to the steering knuckles. Whenever the steering wheel is turning while the car is driving down the road, it is the front ball joint that allows the front wheels and suspension to travel back and forth, as well as up and down. If a ball joint fails, the wheel becomes completely free to move in any direction, potentially causing damage to the car's wing, tyre, and other suspension components. It could also lead to a serious accident, and this is the reason why when car owners carry out a MOT history checker online for their vehicle, they will find a worn-out ball joint a common reason a MOT test has failed. When looking for MOT history checker to do a routing car service or car repairs, request that the mechanic also perform a full health check on your car so you are aware of any faulty parts or those that are wearing out and will need to be replaced