The ball joint is held to the control arm by three 18 mm bolts.

Remove the bottom two nuts with a breaker bar or long wrench.

Place a breaker bar over the gold nut on the bottom of the control arm.

The breaker bar alone will not be able to loosen the nut, since the bolt is free to rotate.

Place an 18 mm box end wrench over the bolt on top of the control arm.

Turn the breaker bar and the wrench in their respective counterclockwise directions to loosen and remove the third ball joint-to-control arm bolt.