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definitely annoying
Crashes / Fires:
0 / 0
Injuries / Deaths:
0 / 0
Average Mileage:
41,400 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.

2011 Mazda CX-9 brakes problems

brakes problem

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2011 Mazda CX-9 Owner Comments

problem #2

Mar 022015


  • 58,800 miles


This is the second happened to my Mazda CX9, 2011. The brake started to have hissing sounds while stepping on brake. The brake pedal is harder than usual to depress. The brake functions has been reduced around 30~50% less than normal. This has put deriving safety in jeopardized. This is the second time my CX9's brake booster failure. The first time is in year 2012. I worked with Mazda to have brake booster replaced. However, dealer seemed not realized there is a warranty extended program from Mazda --- Mazda special service program -93 (ssp93). This is official recorded in NHTSA action number PE14005. Dealer tried contacting Mazda for this program. But Mazda kept not responding, it has been two weeks but still not message back from them. I paid the repairmen of the defective brake booster (parts & labor) from my own packet at this point. Despite the defective parts for jeopardizing driving safety, my complaints to Mazda is also for their non-responsive to customer's warranty program which they have made.

- Dededo, GU, USA

problem #1

Nov 242012

CX-9 6-cyl

  • 24,000 miles
I had my Cx-9 GT driving on the road. This happened while I drove on street and stepped on brake the pedal to stop for a red light. I almost hit the car in front of me, because my brake at this time, all of sudden, took longer stopping distance as I expected. It was a close call to hit the car in front of me while my braking system reacted differently. After almost hitting the car, I drove very cautiously in a fear that I might lose the control of my brakes totally; the bad feeling for the unpredictable braking system really put my family's safety in a compromise. I have only had this car for one and half year and drove around 24,000 miles. This never happened to the three cars I have drove in my 20 years of driving history. The braking system should be designed and provide what it should perform without any compromise. But this one didn't do the job it should. Don't even see any warning light in the dash. Today, I took my car to the Mazda service. They responded that one of the components of the braking system is defective. They mentioned that the "brake booster" is broken. I am so surprised at how these instrumental systems easily break in just less than two years, without any warning?? would this be a serious issue that would affect any Cx-9 models and cause further life threatening results. I like to pop up this concern to the safety authority for further investigations.

- Tamuning, GU, USA

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