soak them well with a good penatrant,then use a 6 point socket to try to loosen them,a little back and forth motion may do it.if it turns out they are so rusty they will not move,i suggest just buy new ones.
Mine rounded off, they were really rusted in bad. I just replaced the whole wheel cylinder, it was only like 10 bucks, and if you do that, then you know the assembly is new including the seals. But yeah if you don't do that, listen to what Heavy Metal said and use a 6 point socket not a 12 point.
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