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ANSWER by Visitor , June 07, 2011
Whoever changed the pads might have loosened the brake fluid hose by mistake and didn't tighten it up well or the it lost it's thread since it's a screw very tight to loosen up. I woulf take the car back to whoever did it
First - don't drive the car - have it towed to a repair facility, probably the one that replaced the brakes.
A leak should be pretty visible from any of the hydraulic components, so a good physical inspection is in order.