Mazda 323F - Squeezing rear brake piston back into caliper - cliff

Anyone know how to return the rear brake piston back into the caliper, it moved out easily using the brake pedal, I've tried squeezing with a g-clamp but no luck!

Mazda 323F - Squeezing rear brake piston back into caliper - Peter.N.

It probably needs winding back, a haynes manual would probably help. There are some special tools available on ebay for not to much money.

Mazda 323F - Squeezing rear brake piston back into caliper - cliff

I was wondering if it should be wound in as the face of the piston has a little notch on opposing sides, I'll look in the morning.