Brake Drum Wheel Cylinder Problems of Mazda CX9

O was operating the vehicle and the brakes became spongy and failed to stop the vehicle unless I increased the effort to depress the brake pedal down. Foot has slipped on occasion causing my ankle to be struck on the pedal. I now down shift gears to slow the vehicle to assist in stopping while keeping even further back from vehicles in front of me. Currently, no recalls are out specifically for my VIN but the year make and model are consistent with the current recalls out for bad master brake cylinder and brake booster. Both of which have failed in my vehicle. I have contacted the gaithersburg MD Mazda dealership and they insist the vehicle is not recalled and are suggesting I pay out of pocket for a known recall on these vehicles. Any assistance would be greatly appropriated. Thank you.

See all problems of the 2008 Mazda CX9 🔎.

Current mileage: 125707. Noted brake fade, insufficient braking response during normal city driving. The vehicle was towed to a location to have the brakes examined. New front rotors, calipers and brake pads were installed. Brake system bled and vehicle test driven. Normal braking during speed tests of city driving and emergency braking. Vehicle then driven for 2-3 days of normal operation. Operator driving the vehicle and when braking to a stop on approach to an intersection noted the brake pedal went to the floor before vehicle would slow. The pedal had to be pumped to obtain a measure of brake response. The vehicle took longer to slow to a stop. Also noted during braking was a "hissing" noise when depressing the pedal. Pedal was then pumped up on approach to any anticipated stopping point. Vehicle taken to be checked for possible air in the brake lines. Brake system checked for air in the brake lines and none found. Taken to a third-party shop for analysis. It was determined that the Mazda oem power brake booster had failed and per the mechanic (note attached pdf) the diaphragm had become "brittle" and the brake power booster failure caused the "hissing" noises and the brakes to be causing the brakes to become unresponsive. The oem brake booster had to be replaced. During a review of online information it was discovered that the NHTSA had conducted an investigation into the issue of master brake cylinder leakage regarding this generation of Mazda brake boosters. The vehicle has been in to a Mazda dealership for prior recall replacement of other defects, however this potential defect was not addressed.

See all problems of the 2011 Mazda CX9 🔎.