really awful
Crashes / Fires:
5 / 0
Injuries / Deaths:
2 / 0
Average Mileage:
56,471 miles

About These NHTSA Complaints:

This data is from the NHTSA — the US gov't agency tasked with vehicle safety. Complaints are spread across multiple & redundant categories, & are not organized by problem.

So how do you find out what problems are occurring? For this NHTSA complaint data, the only way is to read through the comments below. Any duplicates or errors? It's not us.

2010 Mazda CX-9 brakes problems

brakes problem

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2010 Mazda CX-9 Owner Comments (Page 1 of 2)

problem #40

Sep 052016

CX-9 6-cyl

  • 85,000 miles


The brakes on our 2010 Cx-9 are hissing upon brake engagement and have a hard feel to them for the first half or so. The brakes are slow to engage during this time. After the half way mark the brakes engage quickly and forcefully. It is consistent with the other complaints for the brake booster failure. I am having it looked at this week at a Mazda dealership.

- Bountiful, UT, USA

problem #39

Sep 282016


  • 146,000 miles
Poor braking which Mazda recognized as a brake booster and master cylinder problem but never notified its Cx-9 customers to go to the dealership to have the repair done.

- Churchton, MD, USA

problem #38

Sep 222016


  • 105,000 miles
2010-11 Cx-9 brake booster failure. Rapid onset from first symptoms to complete failure braking occurred within 45 minutes of driving on heavy interstate congested traffic during rush hour. Breaking failure is most significant if breaking is first applied lightly as a cautionary measure. Applying light breaks results in breaking system pressure to rapidly drop disabling assisted breaking within a few seconds. Breaking a heavy vehicle with fail power assist almost always resulted in either insufficient braking, or wheel lockup. (note, ABS fails). The assist braking then returns if brake is release for more than 10 seconds providing the brake is not applied. This is a significant safety hazard that may easily result in the destruction of property and death. The defect seems to have been glossed over by the NHTSA in April 2014 when the NHTSA investigation into this failure was closed. It appears that the investigation was closed when Mazda elected to use standard us mail to inform affected Mazda owners that it was 'extending its service warranty' by giving customers 1 year from notice to have the defective part replaced. If the Mazda owner did not receive or act upon the 'extended warranty' within the following 12 months and the brake booster failed, the customer would be responsible for over $1000 in repair costs, serious property destruction or even death. It is shameful that the NHTSA closed it's investigation so quickly on account of such remedial action by Mazda corporation.

- San Mateo, CA, USA

problem #37

Jul 092016


  • 122,000 miles


Brake booster failed, dealership indicated it was under extended warranty. Brought in for repairs at no cost, Mazda failed to acknowledge and do repair. Cost me $556.21 for a very serious safety issue that is under investigation. Would like to get reimbursed. Loss of brakes, unsafe to drive. Hissing sound from brakes when pressed

- Pomfret, CT, USA

problem #36

May 062016


  • 69,000 miles
Braking power booster system failed while driving. My booster brake and master cylinder went out suddenly and there were no warning lights. When applying full pressure on the brake, a loud hissing sound could be heard on the highway. In order to make a complete stop, I had to press the brakes far in advance of my stopping point to ensure the vehicle completely stopped in order to avoid hitting the vehicle in front of me. After this happened, I immediately drove the vehicle to my closest trusted mechanic (tires plus) to have the booster braking system inspected, and inevitably replaced. Tires plus completed the repairs and told me about another unrelated recall issue and recommended I take the vehicle to my closest Mazda dealership (classic Mazda orlando) to have the recall done for free. When I made the appointment for the unrelated recall item, classic Mazda informed me that the braking booster system that I just had replaced by tires plus was actually a warranty issue that Mazda corporate would have repaired at not cost. Classic Mazda suggested I file for reimbursement with Mazda corporate. Upon filing for reimbursement with Mazda, I waited about 4 weeks and then followed up with Mazda to confirm the date I should expect delivery of the check. At that time, they informed me that I was not entitled to full reimbursement because I should have taken or had the vehicle towed to my closest Mazda dealership for repairs. Not having any knowledge of the braking system warranty and fearing for my safety, I proceeded to have the repairs done immediately. All I want is for Mazda to fully reimburse me for the repairs and not just for "reasonable repair costs." This could have turned out much worse had I gotten into an accident, so shorting me $177 is a battle that I should not have to fight with Mazda corporate.

- Orlando, FL, USA

problem #35

Jun 092016


  • 91,000 miles
The brakes have become "hard" and have to be pressed all the way down to work. The car is slow to stop unless you jam on the brakes. It feels unsafe to drive as it appears a rear-end collision could easily happen. We have been told that the problem is the brake booster unit and there is an extended warranty to 7 yrs, 90K. However, this car has 91K.

- Katy, TX, USA

problem #34

Jun 042016


  • 100,015 miles


Vehicles brakes suddenly stopped working causing a low speed collision. I had the brakes inspected, and was told this was a known issue with my car, but Mazda did not initiate a recall. I then discovered that the NHTSA had struck a deal with Mazda, agreeing to an extended warranty with no customer notification. This is a clear case of a government Agency that is supposed to protect consumers, shirking their duty. NHTSA and Mazda you should be ashamed of yourselves!

- Lunenburg, MA, USA

problem #33

May 212016


  • miles
Brakes make a hiss sound when pressed. Sounds like air leaking out. Very hard to brake. Sounds like brake booster as I read about this issue everywhere.

- Warwick, RI, USA

problem #32

Nov 282015


  • 90,000 miles
My brake booster has failed and caused a near crash. The hissing sound when pressing the break occurs and the brakes do not come to a complete stop. I had the vehicle inspected and the same brake booster failure that has been reported has been previously reported. I was never notified from Mazda of the warranty extension and now that my mileage is at 101,000 miles I've just missed the "warranty extension" and they refuse to make the repair. Why is this just an investigation and not a complete recall? Mazda clearly knows there's a problem and this can cause serious accidents with injury. My wife, who is the primary driver, is pregnant and have 3 small children that use this vehicle.

- Savannah, GA, USA

problem #31

Nov 032015


  • 85,000 miles
For several weeks now I have been hearing a hissing noise coming from my brake pedal when engaging the brakes. Now, for the past several days I have noticed that the brake deal become very hard to press down when trying to stop. Today I was very scared because I didn't think the car would stop.

- Newark, NJ, USA

problem #30

Dec 092014


  • 60,000 miles


Vehicle brakes lighting dim while coming to a stop and can not be seen from other vehicles approaching from behind on the road. When not replaced, stop light will run continually or not function, potentially causing premature bulb failure, safety issues and/or the transmission will not shift out of park. A failed stoplight switch will prevent the brake light from illuminating when the brake pedal is applied that may cause a collision and a life lost.

- Chicago Ridge, IL, USA

problem #29

Sep 182014

CX-9 6-cyl

  • 70,000 miles
Same braking problem for which Mazda issued an extended warranty in April of 2014, where Mazda knows they have a defective part impacting the quality of braking, in which under pressure would generate a hissing noise and loss of braking power, extreme difficulty pushing the brake pedal (and complete loss of braking ability). Our incident occurred while traveling on interstate 10 at speeds exceeding 60 mph and traffic slowing. As I attempted to brake to decrease speed with slowing traffic I realized the car was not slowing and I had no option but to quickly swerve to the shoulder to avoid making contact with the slowing cars in the lane. The problem continued and I immediately contacted my Mazda dealership who recommended I immediately bring the car for service. Mazda obviously knows there is an serious issue as well as the NHTSA (why aren't they forcing Mazda to announce an immediate recall vs. Allowing an extended warranty?). I could easily see how this issue could lead to a critical accident or fatality. Come on NHTSA wake up... how about we sue you as not taking ownership and protecting public safety for known issues" why place all the burden on the manufacturer" what even frustrates me further... when the car was brought in to be serviced, they don't even have the parts available.

- Redlands, CA, USA

problem #28

Jul 232014


  • 59,575 miles
My brakes basically failed! when I was driving, I tried to apply my brakes and I could tell right away something was wrong. The car had a lot of trouble stopping and I was afraid it wouldn't stop. The brakes felt very hard and I had to apply a lot of pressure to them to get the car to stop. I had to almost stand on the brakes to get them to work. When I called my mechanic he said it sounded like the brake booster failed which apparently is very common in this make and model of car. I almost hit a car when this happened and it was very dangerous and quite scary! it was also very expensive to fix, but would have been a lot worse if I had hit something.

- San Diego, CA, USA

problem #27

Jul 072014

CX-9 6-cyl

  • 42,100 miles
I was driving around town and attempted to brake. I noticed that there was a odd pressure that was not allowing me to brake properly. I had to push hard in order to feel my car slowing down. After I pushed past the pressure, the brake pedal was able to push down normally to a full stop. It has done this every time I have used the brake since. It is now getting much worse and becoming increasingly harder to push the brake down to get the car to stop. As I was parking in my garage I was almost unable to stop in time so that I didn't hit the back wall of the garage. The brake pedal when pressed completely to the floor makes a squealing noise. I have parked the car in the garage and do not plan on driving it until I can get it looked at. As I said, it is getting worse every time I drive it and I believe my safety is compromised when driving this vehicle in this condition.

- Norwalk, OH, USA

problem #26

Jul 092014

CX-9 6-cyl

  • Automatic transmission
  • 41,000 miles
The contact owns a 2010 Mazda Cx-9. the contact stated that the brakes failed intermittently. The contact mentioned that he had to apply force in order to stop the vehicle. The vehicle was taken to the dealer. The manufacturer was notified of the failure. The approximate failure mileage was 41,000. Updated 8/28/14 the consumer stated the dealer repaired the vehicle. Updated 09/15/2014

- Leland, NC, USA

problem #25

Jun 122014

CX-9 6-cyl

  • 56,977 miles
Brake pedal would not depress. Car hit another vehicle that was stopped and it hit another vehicle. The Mazda never even slowed before hitting the stopped vehicle. My wife was driving and she has had this issue before but it was intermittent and we could not get it to act up to bring it to the dealer. The 3rd car involved I do not have a status of. [xxx] information redacted pursuant to the Freedom Of Information Act (FOIA), 5 U.S.C. 552(B)(6).

- Sulphur, LA, USA

problem #24

May 232014


  • 50,425 miles
Vehicle did not stop (just like slide) when applying the brake. Needed to apply the brake pedal several times to stop the vehicle.

- Richardson, TX, USA

problem #23

May 292014


  • 94,057 miles
The contact owns on a 2010 Mazda Cx-9. the contact stated that while driving at 10 mph, the brake pedal became stuck to the floorboard and made an abnormal noise while the contact was attempting to stop. The contact was able to release the brake pedal and stop the vehicle by depressing the brake pedal several times. The vehicle was not diagnosed or repaired. The manufacturer was not made aware of the failure. The failure and current mileage was 94,057.

- Cordova, TN, USA

problem #22

May 152012

CX-9 6-cyl

  • 19,000 miles
I filed a complaint through Mazda in 2012 and it didn't go anywhere. I saw an article in usa today, regarding my vehicle stating that an investigation was started due to 7 reported incidents on brake failures which resembled my experience. I am now sharing my story as it could have resulted in serious injury. I was approaching an intersection and applied the brake but the car did not slow down, I pushed the brake all the way to the floor and the wheels squealed but the car did not slow. I let up on the brake and reapplied and that is when the car began to slow down. But, it was too late. I hit the car in front of me and launched it into the middle of the intersection. Thankfully, the light had just changed and the cross traffic was at a stop. When the police arrived, they noticed one skid mark on the driver side only which was around 200 yards. About 4 feet prior to impact, there were two skid marks, one on each side of the vehicle. They said that they had never seen anything like it and that I should take it to an independant person to get the brakes checked out. I have photos of this and sent all of the documentation sent to the insurance company and to Mazda. I felt neither believed me and was very diappointed in Mazda's response. Eventially, I gave up. We actually were going to sell the vehicle as I didn't feel comfortable driving it. However, after all of the responses I was getting about what I described as impossible with anti lock breaks or that it was a result of "panic breaking", I second guessed myself and we still have the vehicle. On a separate occassion 2-4 weeks prior to the accident on May 15, my husband was driving very slowly in a residential area and when he applied the brake, the car initially did not stop until reapplying. He rolled part way into the intersection. I was with him when this occurred.

- Phoenix, AZ, USA

problem #21

Feb 042014

CX-9 6-cyl

  • 44,521 miles
The vehicle stalls when idling at a stop light or in a drive thru. The vehicles motor begins to shake and then eventually dies and stalls out and the vehicle must be started again with the turn of the ignition. The braking system is also defective. When at a stop light and your foot is on the brake pedal. The pedal suddenly sinks as if the brake fluid in the master cylinder has drained fully and the brake pedal sinks all the way to the floor and the vehicle shoots forward even if your foot is on the brake. Another problem is in the power door lock system. There has been a time when the power door lock was stuck and the rear right door could not be shut. I had to drive the car to the dealership with the car door flopping all over the place. They were able to fix it at the dealership but could not figure out how it occurred. They were as puzzled as I was. The car was bought back in 2010 brand new from the Mazda dealership. The reviews were good for the vehicle. Its the first Mazda we purchased and is probably going to be the last.

- Indio, CA, USA

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