hardly worth mentioning
Crashes / Fires:
0 / 0
Injuries / Deaths:
0 / 0
Average Mileage:
104,232 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.

2007 Mazda CX-9 brakes problems

brakes problem

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2007 Mazda CX-9 Owner Comments

problem #3

May 032015


  • 122,000 miles


My vehicle's braking system had been functioning normally with the exception of the sound of a "hissing" when applying the brake when stopped at a red light. I stopped to get gas on May 3rd, 2015 and upon restarting the vehicle, the power assist on my brakes was gone. Upon doing some research, I discovered that Mazda had issued a special service recall that was VIN specific on this exact issue; however, my VIN # was not included therefore I was never notified. For those vehicles affected, Mazda issued an extended warranty between the dates of March 31, 2014 - March 31, 2015 (ssp93 - www-ODI.NHTSA.dot.gov/cars/problems/defect/results.cfm?action_number=PE14005&searchtype=quicksearch&summary=true). My vehicle did not present with the problem until 33 days past the expiration of Mazda's extended warranty, and they now refuse to cover the cost I incurred to fix the problem. This vehicle was not suitable to drive once the power assist on the brakes failed. If my VIN was not identified as part of the original recall, there are likely other vehicles that have or will experience this exact same problem - and they may not be as lucky to have it happen when they're stopped at a gas station like I was. If the power brake assist were to fail during normal driving, accidents and subsequent injury or loss of life could easily occur. This needs to continue to be investigated, and a full recall should be issued.

- Oak Point, TX, USA

problem #2

May 312014

CX-9 6-cyl

  • 107,484 miles
For a couple of weeks, I've been noticing a hissing sound coming from my brakes on my 2007 Mazda Cx-9. I didn't think much of it at first until tonight. My sister was driving the car and said it was extremely hard to brake the car. I wanted to see what she was talking about, so I got in the car and as soon as I placed my foot on the pedal to start the car and put it into reverse to back out of the driveway, the hissing sound was very loud and much more noticeable than before. Once the car was in gear, the breaks were kind of stuck on. The car wouldn't go backwards in idle and when I pushed the gas for it to go there was a grinding sound coming from the wheels. I didn't like what was going on and didn't want to take it down the road. I decided to put it into drive and pull into the garage when the brakes failed completely. I couldn't push the pedal at all and the car kept rolling into the garage, so I had to slam on the E-brake and slam into park for it to stop so I wouldn't crash into the house. I saw a few other people with the same problem which led me here to report it. Mazda really needs to do something about this problem before someone seriously gets hurt or even killed. If this were to happen to me at road speeds when I needed to stop, there could have been wreckage, possible injures or even death.

- Andrews, NC, USA

problem #1

Oct 182013

CX-9 6-cyl

  • 83,213 miles
On Friday, October 18th 2013 I was involved in a near accident on my way home from work on interstate 99 off the 17th street exit near altoona pa. The brake system failed as I tried to come to a stop on the exit ramp. I placed my foot on the brake pedal and noticed I was not stopping. I could hear a hissing/air sound when I pressed down on the brake pedal. I had to pump the brakes, gear the car down in manual, and swerve off the road to avoid crashing into the car that was stopped in front of me. No dash lights were on giving me no warning that there was anything wrong with the brake system in the vehicle. II took my vehicle to the local Mazda dealer and found out that the cause of the brake failure was a leaky master cylinder and that ruined the brake booster. I brought my car to my local dealer in good faith to see if Mazda would replace the parts or at least provide the parts to fix the car since there was a prior investigation into the faulty master cylinders. I then was informed by the service department that their Mazda representative has not heard of any investigations into the faulty master cylinders. So I contacted Mazda directly via the customer service number. I spoke with a [xxx] and my complaint was filed with Mazda documentation number 149440377. I was then informed that Mazda was not willing to replace the parts needed to fix the car as the dealer's service department said the car was unsafe to drive. Total cost to fix the vehicle was $2300. This vehicle needs recalled and the faulty master cylinders need to be replaced by Mazda before someone get killed. Information redacted pursuant to the Freedom Of Information Act (FOIA), 5 U.S.C. 552(B)(6).

- Altoona, PA, USA

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