KH brake help

Thanks Jim,
I picked them up a few years back and they have been sitting in the garage. I sealed them with brake fluid thinking it would help. I will give it a try one more time with the vice. I had one side start to move and I placed a clamp on it and started to pump and the other piston got away from me and popped out.
I have the the halves soaking in PB blaster hoping to free them up.
I will let you know how it all goes.