general problems of the 2011 Mazda CX9 - part 1

Brake booster failure. The power assisted braking has stopped working. There are no leaking vacuum hoses and the check valve is working. The brake pedal travels to the floorboard.

The contact owns a 2011 Mazda cx-9. The contact stated while driving 20 mph, there was an abnormal sound coming from the brakes. The contact stated that the brake pedal was firm and difficult to depress while attempting to stop the vehicle. The vehicle was not diagnosed or repaired. The manufacturer was contacted, and a case was filed. The failure mileage was 67,000.

Braking trouble recent in weeks in 2011 Mazda cx-9 vehicle. Had mechanic (euro motorsports in chagrin falls OH) check it out. Turned out to be a faulty brake booster. Mechanic test drove car; braking failed and he almost rear-ended another vehicle. He found on line a Mazda service notice dating from April 4, 2014 called ssp93. Mazda issued an extended warranty of 7 years or 90,000 miles, whichever came first, to have defective part replaced by an improved part. But we were never informed by Mazda of bedford, where we bought the vehicle. Currently, our vehicle has about 83,000 miles. Never knew there was a problem until recent trouble with the braking. There are thousands of cx-5, cx-7, and cx-9 vehicles in operation in u. S. Right now; probably many owners have no idea there is a brake defect in their vehicles that could cause a serious accident, potentially fatal. Mazda should have done a recall in 2014, not an extended warranty. Although brake boosters are supposedly good for at least 150,000 miles of driving, our brake failure at around 83,000 miles proves otherwise. Nhtsa should order Mazda to recall all vehicles with the defective brake part and replace them at Mazda's expense, probably hundreds of dollars each time. We do not want to have our brake booster replaced by our regular euro motosports mechanics because a recall must typically be repaired by the dealer. We already filed a complaint with state of ohio attorney general's office, but their people say the complaint must first go through bbb. No urgency on their part at all, even when informed potentially fatal flaw in the brakes. To avoid dangerous accidents, NHTSA should act more swiftly. Thanks.

The brake pedal seems hard too stop the car when in motion on public streets, vehicle continues too roll upon pumping brakes, have too continuously pump the brake hard too stop the vehicle, had the front brakes replaced recently, and brake pedal is still not functioning correctly, possibly the brake booster.

I went from having brakes to having to push the brake to the floor, which still did not stop the car, all in the same day. I was lucky not to wreck but could not stop for stop signs or stop lights all while my 22 month old was in the vehicle. Something in the brake system messed up, and it still had a full thing of brake fluid. I believe that it is the brake booster causing this problem.

The contact owns a 2011 Mazda Cx9. The contact stated that while his wife was driving approximately 13 mph and attempting to slow down, the brake pedal was harder than usual to depress. As a result, the driver rear ended the vehicle in front causing a five vehicle collision at a traffic light. None of the frontal air bags deployed. The police were present and a police report was filed. There were no injuries reported. The vehicle was towed to an impound lot where the insurance company was scheduled to have an inspector inspect the vehicle. The vehicle was not taken to the dealer for a diagnostic. The vehicle was not repaired. The manufacturer was not notified of the failure. The contact referenced NHTSA action number: pe14005 (service brakes, hydraulic). The VIN was not available. The approximate failure mileage was 86,000.

Brakes when applied would sometimes go to the floor before stopping. The brake booster has gone bad and very dangerous almost causing an accident. Brake pedal soft and sometimes will not stop.

Brake booster is leaking. Takes longer to stop. Called Mazda and reported issue.

Brake pedal is very hard and vehicle is not stopping well almost causing an accident.

When trying to stop at an intersection, the brakes did not respond as usual. Even with pressing the brake pedal as hard as I could, the stopping distance increased by at least 30 feet which placed me in the middle of the intersection. This is worse in hot conditions. There is also a hissing noise when the brake pedal is depressed. This continues to happen and does not feel safe to drive. A mechanic said it may be the power brake booster. I noticed that this was investigated, Mazda issued a special service program which ended in 2015. The letter issued at that time said it was not necessary to take action unless there was a problem at that time. Mazda should extend the service program because this is clearly a safety issue.

I noticed a significant problem braking on my Cx9 to where I had to almost stand on the brake pedal to stop. Added brake fluid hoping that would help but did not. Took it to Mazda dealership in buford,GA and they confirmed the brake booster was causing the problem and strongly recommended replacement ASAP. They explained the problem is a known issue and Mazda extended the warranty to 90k miles. The problem for me was my '11 Cx9 had 107k. I had no choice but to pay to have the problem fixed due to my personal safety. A couple days later I called Mazda customer experience and voiced my disappointment that this part was never recalled and people are driving around in unsafe Cx9's. They did confess that if I would have called them 'before' my repair they could have reviewed the issue and perhaps offset some of the cost. This left me very disappointed since they would have preferred I kept driving the car and risked injury to others while they reviewed the case. #cx9sadness.

In Dec. 2018, I had my 2011 Mazda cx-9 to a Mazda dealer service shop for what I felt like a spongy brake pedal. When I picked up the car the service advisor told be there is nothing wrong with the car's brakes. After a few months, while the symptom persisted, I found out there is a know issue with the brake booster, which Mazda acknowledged and issued a warranty extension (which is expired now). Two days ago, while traveling in traffic on highway, I had to stop the car due to a sudden traffic jam and I felt the brakes being insufficiently effective to stop my car safely. As such, I pumped the brake pedal 3-4 times and that caused the pedal to become very hard and made matters worst- to a point where I had to pull on the shoulder to avoid rear-ending the vehicle in front of me.

Difficulty pushing the brake pedals and achieving a full stop. Sometimes car would inch forward when brake applied. Sometimes hearing a hissing noise when trying to apply the brakes. The noise seemed to come from the area of the brake pedal. Overall, brakes did not appear to be working as intended. Primarily experienced at lower speeds. Has happened repeatedly over a few weeks.

I started noticing it was taking a long distance for my vehicle to come to a stop. I took it to my mechanic. We took it for a test drive and he confirmed there was a problem with the power brake booster. When he was driving, if he pressed on the brake pedal hard, he could make the car have a long "beep" sound. Otherwise, he, too, noticed the long distance required for the car to stop.

Mazda cx-9 2011 has un-detected water pump leaks which cause to engine overheat and eventual engine death. Mazda corporate is unwilling to CO-operate. Car suddenly came to a halt showing engine light on. . And I had to replace the brake booster also because when I was driving the vehicle it turn off on me everywhere and I had to pay out of my pocket and im still paying for this vehicle right now my vehicle is in a garage because is not drivable.

Brake pedal is rock hard and takes immense pressure to press down to get brakes to engage. Hissing noise coming from under dash it seems.

Loss of power brakes. Excessive brake pedal pressure needed to stop vehicle. Hissing noise when depressing brake pedal.

I was approaching an intersection where I needed to stop with my children in the car, I went to hit my brake pedal and it was stuck in the up position and I couldn't stop, I had to quickly turn my wheel to hit the shoulder of the road to slow down and to avoid being hit in the intersection. The car brake then eventually released after hearing a hissing noise and it slowly going into the down position. When I had a mechanic look at it, he explained that it clearly is a failure of the brake booster. We researched it and found that similar issues happened with my make and model in the past but Mazda does not want to honor the defect as its special service call on it ended in 2015.

Uninformed about the 2011 Mazda Cx9 brake problem which did not show up until 8-22-2018, I was informed that while Mazda extended their warranty, the warranty had ended in 4-2018 or when the car had 90,000 miles logged. (my car is at 91,244 miles. ) the car is unsafe to drive, the brakes are suddenly not working, and this is a documented problem with my make, model, and year. There is no more important safety feature in your car than the brakes. Yes, teenage drivers � that's even more important than bluetooth connectivity. Unfortunately, owners of the 2010-2011 cx-9 have been having problems bringing their car to a stop. The brake symptoms cx-9 owners, especially those in hotter climates, have been telling harrowing tales of brake problems centered around: the brakes became hard to push, there was a hissing noise from the pedal and the car would not stop until the brake petal was pumped.

Brake peddle stiff, makes hissing noise. At times while in traffic loss of braking ability happens.

The brake start losing power and need to push really hard to stop. . And also make losing air sound when push on brake.

My brakes did not respond as they normally would upon application of the brake pedal when approaching an intersection on Thursday morning. It felt almost like there was a pillow under the brake pedal. This occurred once on Thursday morning, and once on Friday afternoon. Friday evening brake fluid was filled to ensure that there was not a lack of fluid causing the problem, however the problem again occurred several times on Friday evening after adding brake fluid. By Saturday morning it was worsening both in frequency (occurring with every application of the brake) and severity (felt as though no matter how long and hard I applied pressure to the brakes it would not perform in a manner that would be effective in anything other than very slow speeds with excessive space between all vehicles). On Saturday it also began making a hissing noise which occurred as I was depressing the brake pedal, then stopped when the brake pedal was finally fully depressed (which took an extraordinarily long time). I felt it was no longer safe to drive other than to get it to our mechanic which I did on Monday morning. Our mechanic tested it and determined that the brake vacuum booster had failed and had to be replaced.

Notice while on line for gas, maintaining foot on brake pedal car began to move forward and had to apply more foot pressure. Car has 690000 miles and over 7 years old. In park while depressing the brake pedal can hear a hissing sound. Symptoms getting worst, braking distances are longer and takes more pedal pressure.

The contact owns a 2011 Mazda cx-9. While driving 40 mph, the brake pedal was depressed, but was extremely firm. The contact stated that gradually the brake pedal traveled to the floorboard before the vehicle was able to be stopped. The vehicle was taken to cardinaleway Mazda-peoria (8424 w bell rd, peoria, az 85382, (623) 738-0755) where it was diagnosed that the brake booster and brake booster switch needed to be replaced. The contact stated that the vehicle was currently at the dealer to be repaired. The contact stated that the failure was intermittent. The manufacturer was notified. The approximate failure mileage was 74,000.

Lost braking power. Pedal has to go to floor to work.

Sitting at a stoplight, my brake pedal came up and the car died. Restarted it, and it ran fine. Happened again at a stoplight. I took it to a shop who said it was a "Mazda" issue . Within a week, my brakes started to not work. I took it to Mazda & they told me I was past the 90,000 extended warranty. I asked them why they wouldn't honor fixing it when it was a Mazda issue and they just said I was past the warranty. Beware of buying a "certified used car"! warranties/recalls will not be sent to you!.

The contact owns a 2011 Mazda cx-9. While driving, the brakes were applied and failed to respond. Additionally, the brake pedal became hard to depress. The local dealer was not contacted. The vehicle was not diagnosed or repaired. The manufacturer was not notified of the failure. The failure mileage was 60,000.

Stiff pedal. No brakes.

My cars brake pedal suddenly became stiff and would not stop my car. I had to swerve to prevent myself from rear ending the vehicle in front of me. At the next stop light I was extremely cautious and after I finally stopped, as I waited for the green light the car began idling oddly then it stalled. Was able to start it back up. It seems to be shifting a little oddly too. Very scary driving my car. Incredibly lucky we weren't injured nor was anyone else. Will have it towed to the shop to be safe.

Had a problem a few years ago related to the traction control system as indicated by the warning light appearing on the dash. Dealer contacted the warranty department to file a claim and said that is would not be covered under warranty because they felt it was due to dirt and not a faulty sensor. The dealer never confirmed one or the other. Second issue is related to a hissing noise coming from the break peddle. Research suggested Mazda was investigated by NHTSA back in 2014 and instead of a recall, Mazda issued and extended warranty for 7 years or 90k miles. Unfortunately my vehicle is within the 7 years but not the 90k. I am currently at 97k miles. Still waiting to see if Mazda will cover the repair or at least discount it.

While driving in the city or on highway suddenly the brake pedal becomes hard to press and creeps down to floor with loss of brake booster, a hissing noise is heard in the car and it becomes very hard to stop the vehicle.

A strange, hissing noise coming from the pedal area. I am having a hard time pushing the pedal during ¿initial pedal application¿, but that effort diminished as the pedal was pressed further while driving. The brakes booster squeals very loud if you push the brakes down while not moving. I did some research and found this is a defective brake booster issue that Mazda had confirmed.

As I was driving my car on a city street, I lost all steering and braking ability. The first time it happened - mazada thought it was a suction from the brake and a tube that was broken. However it just happened again as I was reversing in a parking lot. The car is now with mazada being looked at. . .

Driving from work today on a highway behind an electric truck that stopped abruptly, I applied my breaks kind of quickly and after stopping and taking off again when trying to apply brakes to slow the peddle would be really hard to press and it felt like the peddle was pushing up against you. There is a hissing noise when brake is applied and if you press the brake all the way to the floor there is a squealing noise. The hissing noise is inside the care and sounds to be coming from around the brake peddle area. The car can not be drove at this time because when in movement the brake is really hard to press and it takes very long distances to get stopped. I can't put my children in this car to go anyplace!.

Loss of brake fluid; brake pedal hard to push & not stopping car; noise at brake pedal.