hi i have a 110cc gio hummer and the back brakes flew apart all i can find is a 1 spring and the pads what else am i looking for what holds them in can anyone post pics of the break system

 

Show a pic of your rear brake system and we wil tell you what you need.
It should be a hydraulic setup.
There should be a caliper, brake hose, brake reservoir, hand or foot brake pedal/lever, and a set of pads. These should be mounted to the rear swing arm and be attached to the rotor.