I would try the wd40. I am assuming this is on a drum and not a disk brake. Either way, don't get any oil on the surface of the rotor or into the drum.
Liquid wrench is good too. After you have done this, leave it for an hour or two. Then use a chisel to get between the parts, a little at a time, 180 degrees apart. ie, start a 12 oclock then 6, then 9 then 3 And all over again. Trying to put that chisel between the parts a little more each time.
I am confident that will work. However if not, then you need an oxy-acetylene torch to heat the spacer up and it will then break the rust between the parts.
Good luck
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