2012 Mazda CX-9 Complaints

Brake booster failure caused a near miss. Wife driving with 5 year old daughter in the vehicle. The stopping force required on the brake pedal became excessive and the stopping (safe braking) distance significantly increased causing emotional distress. My understanding is this part (brake booster) has a defective diaphragm that deteriorates over time. The extended warranty created for this particular issue did not cover the vehicle at the time of the failure.

BRAKE BOOSTER INTERNAL FAILURE - This is a known issue and a safety hazard on Mazda CX 9 models and should be investigated again regardless of the age of the vehicle.

The contact owns a 2012 Mazda CX-9. The contact stated while driving 25 mph and approaching a stop sign, depressing the brake pedal the vehicle failed to stop. The contact stated that there was no warning light illuminated. The contact stated that she pumped the brake pedal and shifted to neutral until the vehicle came to a stop. The contact was able to drive to her residence. The contact took the vehicle to an independent mechanic and was informed that the power brake booster and master cylinder needed to be replaced. The vehicle was repaired. A dealer was not contacted. The manufacturer was informed of the failure. The failure mileage was 29,805.

TL* THE CONTACT OWNS A 2012 MAZDA CX-9. THE CONTACT STATED WHILE DRIVING AT VARIOUS SPEEDS, THE VEHICLE STALLED. ADDITIONALLY, THE BRAKES FAILED TO ENGAGE WHEN THE BRAKE PEDAL WAS DEPRESSED. THERE WAS NO WARNING LIGHT ILLUMINATED. THE VEHICLE WAS TAKEN TO AN INDEPENDENT MECHANIC TO BE DIAGNOSED. THE CONTACT WAS INFORMED THAT THE BRAKE MASTER CYLINDER AND BRAKE BOOSTER NEEDED TO BE REPLACED. THE CONTACT WAS ADVISED TO REACH OUT TO THE DEALERSHIP ELDORADO CHEVROLET(233 N CENTRAL EXPWY, MCKINNEY, TX 75070). THE CONTACT WANTED A SECOND OPINION AND THE VEHICLE WAS TAKEN TO ELDORADO CHEVROLET (2300 N CENTRAL EXPY, MCKINNEY, TX 75070) WHERE IT WAS ALSO DIAGNOSED WITH THE MASTER CYLINDER AND BRAKE BOOSTER NEEDING TO BE REPLACED. THE SVC MGR INFORMED CONSUMER HE WOULDNT ADVISED ANYONE TO DRIVE THE VEHICLE UNTIL REPAIRS WERE MADE. DUE TO INCORRECT TITLE WORK THE DEALER REFUNDED SOME MONEY AND TOOK POSESSION OF THE VEHICLE. THE VEHICLE WAS NOT REPAIRED. THE MANUFACTURER WAS NOT INFORMED OF THE FA...

TL* THE CONTACT OWNS A 2012 MAZDA CX-9. THE CONTACT STATED THAT WHILE DRIVING APPROXIMATELY 5 MPH WHILE PULLING INTO A PARKING SPACE, THE VEHICLE SUDDENLY EXPERIENCED UNINTENDED ACCELERATION AND DROVE FORWARD CRASHING INTO A WOODEN SEATING BENCH WHICH WAS PUSHED INTO A BUILDING. DURING THE INCIDENT THE DRIVERS FOOT WAS PRESSING THE BRAKE PEDAL. NO INJURIES WERE REPORTED. A POLICE REPORT WAS TAKEN AT THE SCENE AND THE VEHICLE WAS TOWED AWAY. THE CAUSE OF THE FAILURE WAS NOT YET DETERMINED. THE MANUFACTURER AND LOCAL DEALER WAS NOT NOTIFIED. THE FAILURE MILEAGE WAS 112,000. THE VIN WAS NOT AVAILABLE.