My brake peddle began hissing and my vehicle does not want to stop when in motion, I took my vehicle to a Mazda dealership and they stated it was the brake booster which is a problem Mazda has been having, but my vehicle is not in the years specified in the warranty extention. The dealership stated Mazda is not willing to help or fix the issue, and that we would have to pay out of pocket. It is the exact same problem the earlier models have been experiencing and are being fixed and mine is not. Maxda is aware of this defect and will not help me. My vehicle only has 58K miles and should have theses issues. The hard brake peddle and hard braking occurs on roadways, in driveways anytime the vehicle is moving. It is unsafe and I have avoided several collisions.

- Palm Bay, FL, USA

The front brakes make a grinding noise when repeatedly applying the brakes when going downhill or slowing repeatedly from speeds of 65 or so. I believe the brake parts become hot and create something google searches call "judder". I have had the steering will start shaking as well. After repeated requests to Mazda corporate and visits to two dealers, Mazda claims the brakes work as designed. One service manager at browning Mazda stated the front rotors are too small to stop a car of this weight, but this statement is not written. Regarding the vehicle stability control, when I turn left and go downhill from my driveway at a slow speed of approx 10mph, I usually have no throttle control. I need to apply the brakes to regain any control of the throttle. Once again two dealers tell me this is within design specs. Maybe this is true, however, I have no way to immediately get out of the way of other cars as I have to brake first for the throttle to return. Doesn't seem right to me. Also, my combined mpg is about 13.7 when Mazda states it should be about 18. How can they make such a claim like this and get away with it. It is not just my Cx-9, many people complain on the internet. Again, Mazda states the car is within specs.

- Rancho Palos Verdes, CA, USA

We have 2015 Mazda Cx-9 with 8400 miles that has a leak on the break master cylinder. Which the dealership was denying to be a leak because they saw an old dry debris on top of the fluid depot. But have it checked to an outside mechanic because we've been having a shimmy problem when braking for moths and they still can't figure as to what is wrong with our vehicle. All they are saying is they cannot duplicate the problem that I am saying. To cut the long story short we brought our vehicle to their service again to fix the break fluid leak on the cylinder but they are saying they will not fix it because theres enough fluid on the reservoir and they are saying that the fluid might have come from the cap because of an old leak debris. But I told them that I will not going to be that much fluid underneath the break booster and aound that area. But they still insist that they're not gonna fix it. Probably they are waiting for us to get hurt before they will action on it.

- Prairieville, LA, USA