Brake pedal went to the floor while applying the brake. Pulled car back up driveway and parked and noted almost zero ability to brake the car, pedal goes to floor when applying pressure to the pedal, almost zero ability to come to stop. Checked fluid – was still in reservoir but not at max. level (b/n max and min.). Checked under hood at and no signs of any leaks in engine compartment or on any lines in engine compartment (all good). Looked under car and no signs of leaking. Opened reservoir to top off to max. and by time I went into garage and came back with brake fluid the reservoir was empty, reexamined and found brake fluid leaking from a plastic cover on passenger side rear of car. Placed cover to soak up all fluid dripping/ streaming down to the ground. Called my local mechanic, and he indicated car may need to be towed to be serviced. In looking online, I have found many accounts of this issue with 2010 Subaru outback owners in northern areas where corrosion at the 4-way connector of the brakes lines causes immediate loss of braking and loss of all fluid. Not sure of cost, but I am thinking once it is examined the 4-way connector and all 4 brake lines may need to be replaced. This appears to be a widely known issue and for some reason this was never included or changed from 2005-2009 Subaru recalls to change for 2010 models, so I would like to know why this and the cost for repairs are not covered by Subaru as a RECALL. This could have caused a major accident and severe injury or death if traveling at speed on highway or in area needing hard braking to come to immediate stop. This is now the third major issue I have had in less than 12-months and 2nd from corrosion on my 2010 Subaru. Last summer my front frame had corrosion damage and required replacement. This brake issue with corrosion at the lines to the 4-way connector had recalls in earlier models, but why not in 2010 Subaru Outbacks? Very Unsafe and No Warning Light prior to brake loss !