[wadesdad]

I've not worked on your type specifically, but I'll give you my $.02 worth based upon a Nissan set-up I've encountered.

The pistons twist-in, but be careful, one twists one way and one the other to get them to go back inward. If there is a tension/return spring on emergency brake actuator, try to unhook it.

After I tore a piston boot trying to strong arm the piston back in by using really large channel locks, I bought a little tool that goes inside the piston. JC Whitney sells a "rear disc brake piston tool" for about $8.99 (P/N 38PX3645N) 1-800-529-4486

(you might also try your local "Auto-Parts-B-Us")

Good luck.