The ball joints are part of the front end or front suspension of the vehile, it safely allows for pivot movements between the control arms and steering knuckle for a smooth and comfortable ride and also allows for controlling the vehicles turning precisely. These ball joints fail over time and can cause major damage to the vehicle if not properly looked after. If you are experiencing clunking noises from the front suspension, excessive vibration on the front of the vehicle or your steering wanders to the left or right then you may have a bad or failing ball joint.