Not talking about rebuilding. Wondering if I can get the piston pushed back in so I can put in new pads. I already have a rebuilt caliper and the core charge is only $4 so I might just keep it and experiment with rebuilding it.

For now I just wonder if I can get away without all the labor of replacing the existing caliper. And take the new caliper back.

I could hardly get the piston to push back enough to get out a very worn pad.