Rear Knuckle Assembly

I need to change out the driver side rear backing plate and wheel cylinder on my 94 LX cause somehow it got bent and screwed up the brakes.
Does anyone know how to remove the long lower (bottom) bolt that goes through the control arms on the rear knuckle.
I finally got the nut off, but the bolt won't come out, it won't even turn.
I tried using a hammer to beat it out, but it won't budge.
Is it pressed in or something.

The salvage yard gave me the whole knuckle and backing plate as one piece and I don't know how they got that bottom bolt off.

Some helpful input would be greatly appreciated.

Thanks,
Marvin

you can try to put a jack under it and lift up to try to take some of the pressure off of it, its probably just being held in there since all that weight is on it.

I already tried putting a jack under it.