One problem related to brake fluid leak has been reported for the 2011 Mazda CX9. The most recently reported issues are listed below.
I was driving in my Mazda 2011 Cx9 SUV when I pressed on the brakes and they would not engage. I had to press repeatedly, extremely hard in order to get the vehicle to stop. I have taken the car into my Mazda dealer who is saying that I have a problem with the master cylinder leaking fluid into the booster. Mazda has not sent a recall for the master cylinder only for the booster. This is a very dangerous situation and one that needs to be addressed before someone gets into an accident. This car is 2. 5 years old and has 42000 miles and should not be having these problems. Mazda needs to honor the repair and fix this problem.