CarComplaints.com Notes: The only area of real concern for 2010 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.
2.7
hardly worth mentioning
Crashes / Fires:
0 / 0
Injuries / Deaths:
0 / 0
Average Mileage:
54,235 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.
The contact owns a 2010 Mazda CX-9. The contact stated that while driving at an undisclosed speed, the vehicle was unable to stop while the brake pedal was depressed. The vehicle was taken to an independent mechanic who was unable to duplicate the failure. The vehicle was not repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 162,706. The consumer stated the brake booster was replaced on 07/22/2022.
Cpsc: I1360001A. Mazda CX9 2010. Consumer stated after 36,400 miles on car, a catastrophic brake failure occurred on a two year old impeccably maintained vehicle.
The first time I experienced this terrifying ordeal was in November of 2011. Since then, I have had it happen two more times. The car accelerates of up to speeds of 90 mph without warning. All 3 incidents have happened on the highway. The brakes slow it down, but do not stop it. All 3 times, I've been lucky enough to get the car to the shoulder and ride down the median, pushing the emergency break in and at one point pushing it into park. Mazda knows about this. Therefore they are liable. Mazda will tell you it's a throttle problem, they will tell you there is no wear on the brakes....well, that's because when the car does this unexpected acceleration, the brakes only go part way..almost like pushing against air. This is a serious problem with the computer and possibly throttle combined. My car is not fixed, it's also doing other stuff. Mazda wants me to keep this car and drive it. They are giants, so the little person like me does not matter to them it's the $$$$. but when someone dies, it will cost them $$$$$$$$$$. there needs to be a recall. I hope more people come forward. It could save your life or/and someone you love and other drivers on the road who are in danger of you hurting/killing them. My Mazda dealership have wonderful people who work there. They are very unhappy with Mazda not taking care of this problem. I want to make this clear, it's Mazda Corp that is aware and doing nothing and they hold the Mazda dealers hostage.
- Virginia Beach, VA, USA
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