PMR Hydraulic Brake is busted after 1 week.

#1
I purchased the PMR hydraulic brake about 2 weeks ago. I got about a week of use out of it and it has now locked up. I had to pry it apart with a screw driver. With it off of the brake disc it no longer pushes its self back and just clamps shut. How do you fix this. Im kind of irritated because my mini bike is not usable till I fix this brake. I took the disc pads off and the piston popped out. What could cause this. This is basically brand new brake system.
 
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