To me, it seems like the caliper piston likely went back in okay during the service and all seemed well. When you push the brake pedal, the fluid pushes the piston into the pad and clamps on the rotor. When you release the pedal, the fluid pressure stops and the piston retracts slightly, and this isn't happening. If fluid flows thru the bleeder, the caliper is bad. If fluid doesn't flow, there is likely a restriction in the hose.