really awful
Crashes / Fires:
2 / 0
Injuries / Deaths:
0 / 0
Average Mileage:
75,168 miles

About These NHTSA Complaints:

The NHTSA is the US gov't agency tasked with vehicle safety. Complaints can be spread across multiple & redundant categories, & are not organized by problem. See the Back button — blue bar at the very top of the page — to explore more.

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problem #7

Jul 252022


  • 115,000 miles
The contact owns a 2008 Mazda CX-9. The contact stated while driving approximately 30 MPH, he noticed that the brakes felt loose and the braking distance had become extended while attempting to stop the vehicle. The contact stated that he heard a hissing sound while depressing the brake pedal. The contact stated no warning light was illuminated. The contact stated that the brakes failed completely while attempting to stop for a traffic signal and the vehicle rolled into the intersection. The contact had taken the vehicle to a local dealer, where it was diagnosed that the brake booster was malfunctionin, g and needed to be replaced. The vehicle had not been repaired. The manufacturer had not been informed of the failure. The failure mileage was approximately 115,000.

- Chapel Hill, NC, USA

problem #6

Mar 082014

CX-9 6-cyl

  • 122,000 miles
My wife pulled the vehicle shifting gear in reverse with her purse without pressing on the brakes pedal. After the fact, I double and triple checked it, and this vehicle can shift gear without engaging the brakes pedal.

- Columbus, OH, USA

problem #5

Jul 132011


  • 50,000 miles
There have been a multitude of problems on the vehicle (two sets of brakes, tierod, electrical overhaul vacuum hoses...) the major issue has been oil leaking. This past summer (2011) there was an oil leak. The dealer had the car for several days before diagnosing that it was the rear main seal. The seal was replaced (car was at dealer for nearly two weeks.) this fall (2011) oil was still leaking. After several days the dealer contacted Mazda corporate and they suggested replacing the transmission, claiming it was not uncommon. The dealer replaced the transmission. Winter/spring 2012 oil still leaking, car is currently at the dealer - claiming it is the rear main seal. Again" wouldn't that have been replaced with the new transmission"

- Holliston, MA, USA

problem #4

Mar 032012

CX-9 6-cyl

  • Automatic transmission
  • 68,000 miles
The contact owns a 2008 Mazda Cx-9. the contact was driving 20 mph when the brakes were depressed and the vehicle failed to stop properly, and crashed into a gate. The crash caused no injuries and the police were not contacted. The same failure recurred on multiple separate occasions and without warning. The vehicle was taken to the dealer where the dealer confirmed that both the master cylinder and power booster were leaking brake fluid and needed to be replaced. The manufacturer was contacted. The vehicle was repaired. The failure mileage was 68,000 and the current mileage was 68,200. Updated 04/26/12 according to the repair invoice, the brake booster was leaking due to corrosion from brake fluid leaking from the master cylinder into the booster. The brake master cylinder and booster were replaced. Updated 04/27/12

- Boca Raton, FL, USA

problem #3

Feb 232012


  • 78,175 miles
The contact owns a 2008 Mazda Cx-9. the contact stated that the brake pedal was partially depressed and the contact had to keep pumping the brake in oder to get the vehicle to stop. The contact took the vehicle to the dealer and was told that the vacuum booster failed. In addition, the brake fluid was leaking into the booster. The vehicle was not repaired. The failure and he current mileage was 78,175.

- Brownsville , TX, USA

problem #2

Jan 032012


  • 46,000 miles
The contact owns a 2008 Mazda CX9. The contact stated that while driving approximately 20 mph, the brake warning indicator illuminated on the instrument panel. The indicator remained illuminated until the engine was turned off. The failure had not been diagnosed or repaired. The manufacturer was not made aware of the failure. The contact stated that the defect could possibly be contributed to an internal brake fluid leak. Currently, there was an open investigation under NHTSA action number PE11026 (service brakes, hydraulic:foundation components:master cylinder). The approximate failure mileage was 46,000.

- Fairfax, VA, USA

problem #1

Aug 132011

CX-9 6-cyl

  • 47,000 miles
Lately, my Cx-9 does not come to a complete stop within the expected distance (stop sign or signal), for the usual brake pedal travel. I had to lift my foot and brake hard to bring it to stop. Otherwise, Cx-9 remains a pleasant vehicle to drive and ride.

- Northville, MI, USA