This brake problem has apparently already been identified and resolved for 2010 - 2011 Mazda CX9 - see the following link: [http://www.mazdaproblems.com/trends/hissing-brakes/], but there was no mention of my model year (2012). I discovered this information, on your website, before I went to the Mazda dealer in Edmonton about the brake problem.

Symptoms of the brake problem included: loss of power assist making the brakes really hard to push at times: and, hissing noise coming from behind the dashboard area. The problem with my car started about 2 or 3 weeks before going to the dealership and the "hard pedal" was only occurring during very slow speed parking maneuvers. I printed out the information from the web page, showed the dealer, on March 11, 2016, and explained that my brake problem was exactly as described on your website.

The service people at the dealership told me that they had never heard of this problem and were skeptical that I had accurately diagnosed the problem by simply reading about it on your website. The dealer checked the car and confirmed brake booster failure is the problem, and told me that the car is unsafe to drive. The replacement part has to be shipped from Vancouver BC and I have an appointment on Tuesday March 15th for the work to be done.

I have a concern that, according to the information I read on your website the NHTSA thinks this problem was limited to the 2010 and 2011 model years. Therefore NHTSA, Mazda, Mazda dealers, and 2012 CX9 owners should all be notified that the problem is occurring with 2012 models as well!

Mazda CX- 9 2012 model I purchased on Nov-26-2013 from show room here in Qatar. From the day I have lots complaints in my car. I am complaining about my car to the show room manger and the service engineer and they just make its a silly issues. After a week my car stuck over road several times and they took into the service that is BRAKE POWER BOOST UNIT FAILURE. This I know only after 8 months when I got the service history of my car. They replaced it without saying anything. I ask about the complaints they say just jammed. After one week my car can't start. Again I call them for assist, it took one week again to get them respond about my compliant and they replace the battery and starter.

Another problem with power window motor I can't open and close the both front windows. I inform them they said we will see in next service. After only 5000km I used my car my brake pad and disc got damaged. They say I am a rash driver, that's why brake pad damaged, I replaced it . Before another 5000km I can't use my car because disc and brake pad damaged again. I can't move my car. I ask them service history of my car, they refuse to give me because recently some of other car brands showrooms closed here in Qatar by consumer court because of violations of consumer law. I hope I will get any contact details for Mazda through here better than contact dealer here in Qatar hopefully.

**please ignore any mistakes here I make. Thank you.

Over the course of several days, the brake pedal didn't feel normal or it required more pressure to stop the car. The problem was intermittent and I thought it might just be me. Then I was sitting in a drive-thru and the a/c kicked on or off causing the revs to rise and I lunged forward almost hitting the car ahead of me. I knew that I had a problem at that point.

After some research online, I determined that the brake booster was the most likely culprit. The following Monday, I took it to the dealership and told them what it was doing and that I felt the brake booster was the issue. The service writer explained that Mazda had extended the warranty on the brake booster beyond the basic 3-year/36k mile warranty. Since I was 4550 miles over the 36k limit, I was glad to hear that.

It took four days for them to get the part and perform the repair, but they gave me a loaner to drive. Overall, I still love the vehicle and have had no other troubles since it was new. My only concern is that Mazda hasn't performed a recall on the CX-9s affected (which would cost them a lot more) rather than simply covering the ones that fail under warranty. The potential for an accident is very high for someone when the brake booster fails, especially if the driver needs to stop very quickly or lacks the physical strength to apply a LOT of extra pressure to the brake pedal.

Excellent car!!! No issues accept the bad Brake Power Boost Unit that was replaced under warranty. Acceleration is great, the ride is a true pleasure. Though many convenience additions are absent (e.g. power liftgate, automatic folding mirrors, memory seats, tire pressure sensors) the car is built very well. Comfortable heated front seats (both electrically powered), good noise isolation, pleasant leather upholstery, a lot of cargo space with the 3rd row folded, rear a/c, sliding 2nd row!

Love the car!