luder_5555

this is a dumb question, but do you have the ebrake set, or is there any testion on the cable?

also to those saying that its dumb, it is cause the ebrake is built into the caliper, this is a far superior design than having a drim brake inside the rotor

Maksim

Rent the caliper set from autozone

bAyaSsaSsiNs

SpitfireS is right but i would leave the caliper off, you should leave the caliper off and have someone slowly depress the brake pedal "real slow" just slowly go down to the point where you feel pressure at the pedal then release and do it again, you don't want to go too far as this will build a lot of pressure you don't want with nothing in between the caliper and piston. while your watching the piston make sure you don't go too far out as soon as you see it move your good to go. leaving it off the car usually does the trick for most seized caliper pistons, cause you wont have the pads and rotors between for it to stop so watch carefully you wouldn't want to make a mess. and you have some safety glass on lol, if the caliper is seized most of the time this will do the trick. good luck or you can get a caliper tool set like the pic Marksim put up.. and don't forget the elbow grease.. your going to need a lot of it for a seized piston lol

negcamber

You do have the parking brake off, right?