how much force to push pistons back into calipers, trying to free up sticky brakes Options

[swl]

DaveP is doing me a new set of front calipers but while I'm waiting I'm trying to free up the front right. It was dragging pretty hard and was the only thing that the car failed on its safety check. If I can get that caliper freed up I can start (IMG:style_emoticons/default/driving.gif)

I followed the haynes instructions for freeing up a stuck caliper. Took out the pads. Put in some wood shims. Applied the brakes until they moved. Felt a little pop as the first side moved. Then a pump or two later the second side moved. So far so good. Now I'm trying to lever the pistons back in but they won't budge. How much force should that take? I feel like I'm putting way more pressure on it than it should need. Starting to wonder if I might have a swollen softline.