4 instances of brake failure in the last 3 months. Pedal goes to the floor with no braking. 2009 RAV4. Three different shops have looked at the car - each one reporting that all is good. Currently it's at a Toyota dealer. I have two theories - but I'll hold off until some people weigh in. Unless something definite is found, I'd like to retire the car. The driver has been lucky 4 times - however there was substantial damage in the latest incident. Between each incident, the car was driven for many days/weeks before the next incident occurred. The driver has been driving the car since new - so they should be familiar with the car.