CarComplaints.com Notes: The only area of real concern for 2011 Mazda CX-9 owners is the brake booster.

In 2014, Mazda extended the warranty on the 2007-2013 CX-9 brake booster to 7 years / 90,000 miles. However this extended warranty has expired, so buyer beware.

This Mazda CX-9 brake booster failure isn't terrible in terms of repair cost — it "only" costs $550 average to fix. However it is a safety issue when the brake booster fails as it increases stopping distance. Owners have reported having to stomp on the brake pedal, & crashes/injuries have been reported due to this CX-9 brake booster defect.

2.8

hardly worth mentioning
Crashes / Fires:
0 / 0
Injuries / Deaths:
0 / 0
Average Mileage:
52,346 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 #4

Dec 312018

CX-9

  • 110,000 miles

A D V E R T I S E M E N T S

Our vehicle has water drains or "weep" lines for the sunroof. We recently had the electrical system stop/start, dash lights remain on constantly after sitting in the driveway during the rain. We learned that if the drains become blocked that water leaks into the cabin directly onto the body control module (BCM). Because the BCM is not in a sealed or water-proof case, yet is soaked in these conditions, the vehicle is subject to electrical failure as a result. Replacing the BCM costs about $1,000. When we started the car the dash lights that warn of an issue with many of the vehicles safety systems remained on. Others went off and soft of flashed. We could not determine if there was really an issue with all of the components flashing on the dash so we did not want to drive it for fear of an accident. Our vehicle was stationary (thank god). We waited for a while and were able to leave for home, but this condition is clearly a huge safety risk.

- Livonia, MI, USA

problem #3

May 242017

CX-9

  • miles
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.

- San Diego, CA, USA

problem #2

Jul 242015

CX-9

  • 72,246 miles
On 24 July 2015, while driving home from work, the driver in front of me executed an emergency braking to avoid a collision which caused me to do the same. From the moment I tried to actuate the brake pedal, it felt as if the pedal was in the floor and immovable. Little, if any, brake force was applied and required both feet with all the power of my legs to get even a small amount of braking. I had to immediately dive into the median at speeds of 60-65 mph to avoid hitting the car in front of me. This caused two tires to have to be replaced. When I left my parking garage and all the way to the freeway, braking was normal. No dash lights were active nor are they now. The issue persists now and driving the vehicle is not an option.

- Glendale, AZ, USA

problem #1

Feb 142014

CX-9 6-cyl

  • 27,140 miles
I have not had a accident yet, however since I purchased the car new I have had trouble with the front brakes, especially the right wheel. The dealer say there is nothing wrong and I have complained about this issue several times at regular service. I know something is wrong, the pedal fades and there is a grinding and sometimes hissing noise from the front right. It needs to be corrected by the dealer before something really bad happens.

- Los Angeles, CA, USA

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