sounds like the pins need a good greasing. I use this stuff called silaramic by CRC. clean em out the best you can, and use a light amount of grease to keep the pins sliding.
Basically what is happening is one of two things. you hit the brake and the piston pushes the inside pad against the rotor, and the pins are stuck and not pulling the opposite piece against the outside pad.
or the piston pushes the inside pad to the rotor and the outside pad gets pulled into the rotor, and when you let go of the break, the pins get stuck and hold the inside pad against the rotor.
otherwise the piston is not decompressing and the calipers are defective.
2002 GT 5sp. 16x,xxx miles
Steeda Exhaust, C&L plenum, BBK Throttle Body, Steeda Underdrive, Steeda short throw, unknown stage clutch. Rear main leak. Compressor seal leak. Steeda lower control arms. good tires.