ok, the saga moves on, i have untill thursday for my free retest, dont think its gonna happen now as i recieved the wrong antiroll bar bush from gsfac

anyhow, i have removed the caliper and found that one of the pistons siezed, the other piston i could push in just abou and it would sqirt brake fluid form the pipe hole, but the other one i did manage to get to move in with a g clamp, but much harder than it should be.
my question is, it obviously needs rebuilding but how can i get it out, i already chipped a few bits off the piston trying to lever it out, i reconnected it to the brake line and pumped the pedal, one piston poped out but the other has not moved

i have left it soaking in wd40 at he min, but not sure what else to try.
cheers
jon