So as the title suggests my wife's minivan (a 2011 Toyota Sienna) was missing the driver's side inner brake pad. She texted me to tell me that she heard a noise and then the brakes were not as effective. When I got home the first thing I noticed was a puddle of brake fluid in the area of the driver's side front wheel. Upon further inspection I discovered that the inner brake pad was missing and the piston had popped out of the caliper spilling a good amount of brake fluid. I did not even know this was possible since the pad is pretty much locked in there. A trip to an autoparts store and I ordered a couple of new rotors, pads and the drivers side caliper. I guess the moral of the story is make sure you drive your wife's car once in a while. It must have been making some horrible noise prior to the incident. I guess it could have been much worse. Anyone seen this before??