Ball joints: Keeping your control arm safely connected to the steering knuckle.
The ball joint is an important part of your vehicle, it's the bearing which connects the control arms to the steering knuckle. It looks just like a steel stud and socket, in a steel case which is specially created to connect into the tapered hole of the steering knuckle.
The two types of ball joints: Encapsulated (sealed) or Mechanical (greasable)?
There are two main types of ball joint: Encapsulated (sealed) and Mechanical (Greasable).