Have you managed to remove the bolt? It has to be removed completely before the the pin will come out of the upright.
It can be rusted in and needs lots of penetrating oil, esp. in the 'slot'. Then use a good socket or a hex socket on a breaker bar and move the bolt a little at a time, back and forth, keep adding more penetrating fluid until the bolt finally 'unscrews' from the rust.
If the joint pin is stuck in the upright then get a thin, narrow chisel (cold steel, not wood working) or a chunky screwdriver and tap it into the slot to expand the socket slightly, add more penetrating fluid, then support the hub or edge of the brake disk (use a wood packer under a jack) whilst persuading the wishbone downwards with a hammer applied to the end of a bit of 2x2.
The ball joint pin has a groove which the bolt locates in, this prevents the pin coming out if the nut and bolt were to come loose but also provides a space for rust to build up which is what causes it to stick in the upright.
When I started this reply you hadnt got it free but now you have....doesnt work get in the way of more interesting activities