How to decompress my caliper piston for the rear brakes?

have a 203 svt cobra, i changed the front brakes already with no problem, i used a C clamp to decompress the pistons and everything was fine, so then i moved to the passenger rear barkes and i took it all apart and now im trying to decompress the piston but its not even budging or moving even a little bit, im still using the C clamp, please help i need to fix it cause i need to drive it.!!! please help thank you!!!!!How to decompress my caliper piston for the rear brakes?there are other types of piston designs. some push in with a c clamp and others you need a tool that fit into grooves on the piston and turns them. sometimes you can use a pair of needle nose pliers or screw driver tu turn them but that is not recommended. there is a tool for the job. check out harborfreight tools.com in the brake section. they are cheap tools but wil do the job if you can.How to decompress my caliper piston for the rear brakes?if you have the cap off master cylinder it should go but you might have to open bleeder to release the pressureHow to decompress my caliper piston for the rear brakes?You need the tool that rotates the piston as it compresses it. It does not cost much. Most auto parts stores have them also. Just uses a ratchet to rotate it back in. No c clamp needed.It looks like a hollow box with knobs on it.How to decompress my caliper piston for the rear brakes?Are you trying to compress the piston back into the caliper with the e-brake set? if so release the e-brakeHow to decompress my caliper piston for the rear brakes?You need the tool that Doug W described,without it you'll never get the piston in the calipers.The tool will run you about $8.00 @ any Auto Zone,O'reillys,just about any auto parts store will have them.Avoid Ford if you can,that $8.00 tool will run you about $30.00 @ the dealer.Good luck.