Two problems related to brake fluid leak have been reported for the 2009 Mazda CX9. The most recently reported issues are listed below.
Brake master cylinder leaked fluid into the brake booster causing loss of boost resulting in extremely reduced braking function.
The contact owns a 2009 Mazda cx-9. The contact stated that while driving approximately 40 mph, excessive force had to be applied to the brake pedal in order to bring the vehicle to stop. The vehicle was taken to a private mechanic where the contact was informed that there was fluid leaking from the master cylinder to the power booster. The contact was also informed that the power booster needed to be replaced. The manufacturer was not notified of the failure. The vehicle was not repaired. The approximate failure and current mileage was 38,000.