general problems of the 2011 Mazda CX9 - part 2

Brakes resist when trying to stop, taking longer to come to complete stop(at any speeds). Once stopped brake compresses all the way down on its own, feels like the car will start roll. When applying brakes it makes an air decompression sound. When backing out of parked position and braking, car coasts a little when brakes are completely pressed down. Very dangerous issue that I realized was related to the extended warranty brake booster issue that I received earlier in the year. I attempted to get this repair at the first service I scheduled after receiving notice and Mazda service department refused to complete service because they didn't think my car needed it.

Brakes have suddenly become erratic. Often they are "hard" and require excessive pressure to get the vehicle to stop. My research shows this is a known issue with this year and model, and Mazda extended their warranty to cover the issue; however, that evidently does not apply to second owners.

There is an issue when using the brakes where there's a loss of power assist making the brakes really hard to push at times, a sudden loss of braking ability with super spongy pedals, and a strange, hissing noise coming from the pedal area. These issues happen concurrently when driving in the city or highway and whenever the car is in reverse or drive.

Brakes are making a hissing sound when you press down. The brakes are hard to push and the vehicle is not stopping properly.

Same issue as everyone else hissing when brakes are compressed -or car is stopped and bad or lagging in braking. My brakes were completely down to the floor and the car kept slowly trying to roll. I had to pump the brakes. Or put the car in park. When I let the brakes go no hissing.

Brakes are not working properly or consistently. Sometimes have to press too hard on brakes and other times it works fine. Also, brakes are making a hissing sound like air coming out of tire.

Several times when the vehicle is in motion, and the driver attempts to apply the brakes, the pedal seems unresponsive. During these incidents, the brake pedal is very hard to apply, nearly impossible. Thankfully when this transpired (5-10 times over the last 2-3 weeks), we were traveling relatively slowly. After exerting much more than normal force, the brake pedal seems to depress and help bring the vehicle to a stop, although not at the normal rate of braking. Additionally, during one of these incidents, which happened today, the brakes remained engaged, and the car would not move, even after shifting to park, and turning off the engine. Eventually, after shutting off the engine a second time and waiting awhile, the brakes released. This incident occurred while driving on city streets, and trying to stop at a red light. Most of the other incidents have occurred during city driving, but they have also occurred while driving on the highway as well.

I have recently experienced trouble with my brakes. It has been very difficult to come to a complete stop no matter what my speed is. It feels like I have to push very hard to get the brakes to engage. Also, I hear a hissing noise, like air coming out of the tires when pressing on the brake pedal. No warning lights have come on. I took the car into just brakes last night and am waiting for an assessment. The mechanic said it sounded like a problem with the power boosters.

When breaking I hear a hissing noise and found out my break boaster was going bad.

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.

Brake pedal is very hard to push in. Tried to stop at a light and the brakes wouldn't stop the car, luckily there was't someone in front of me. Brakes feel like I am pushing against a wall, also can hear a hissing or leaking sound when I try to push the brakes.

Vehicle would not slow or stop, had to push pedal hard all the way to the floor to get it slowed. Really thought we were going to have an accident. Took vehicle into shop on 6/5/2015 and was told it was the power brake assist module was bad and needed to be replaced. Owner of shop said we were lucky to not have been in an accident. Come on Mazda you are aware of this situation.

Brake booster goes out causing brakes to unexpectedly malfunction and not stop the car in a timely manner. Brakes become hard to press, sound of hissing air from under dashboard, brake pedal was pressed all the way to floor and still did not stop the car in a safe manner. No warning lights alerted to this problem prior to this incident.

The brakes did not respond to typical pressure required to stop. . . When I pushed harder on the brake pedal it felt like the brakes were starting to engage, however I could not get them to fully engage and stop in time to avoid rear ending the vehicle in front of me. I took evasive action and jumped the curb and directed the vehicle at bank of newspaper stands in order to come to a complete stop.

The contact owns a 2011 Mazda cx-9. While coming to a stop at 10 mph, the brake pedal felt squishy. When the brake pedal was depressed, the brake pedal would almost travel to the floorboard. The feeling was also present while the vehicle was stopped at a stop light. Three months later, the contact heard an air noise when the brakes were being applied. The vehicle was taken to a dealer where it could not be diagnosed; however, the failure recurred. The manufacturer was not made aware of the failure. The failure mileage was 80,000.

I noticed a hissing noise when I press the brake pedal. It goes away when I let off the brake. I haven't noticed a difference in the brake pedal but I will be paying close attention to it. This is a major safety issue and should be recalled ASAP. I have 2 kids that ride in this car. I called the dealership and have an appointment tomorrow. The service department said they heard about this issue but haven't had a repair like this yet. I will update what I find out.

The contact owns a 2011 Mazda Cx9. While driving at low speeds, the contact heard a hissing noise coming from the front brakes. While attempting to engage the brakes to stop the vehicle, the pedal sank to the floorboard. The dealer stated that the brake booster was faulty and needed to be replaced. The brake booster was replaced and the failure was remedied. The manufacturer was not notified. The failure mileage was 43,000.

I went to have new tires put on the car and on the way to the tire shop when I applied the brakes the peddle became hard and was difficult trying to stop the car. After the new tires were put on the same thing on the way home, still has a hard brake peddle when the brakes are being applied.

Brakes makes a hissing sound when you step on it and it is hard.

The contact owns a 2011 Mazda cx-9. While decelerating from approximately 55 mph, the contact noticed that the brake pedal was difficult to depress. The vehicle began making a hissing sound and the check engine indicator illuminated on the instrument panel. The vehicle was not diagnosed or repaired and the manufacturer was not notified. The approximate failure mileage was 57,119.

I was going approx 40 mph, and went to hit the brake pedal at a light, and the brake pedal was incredibly hard and would not push down. I lifted my foot up and tried again. The pedal was still very hard but I was able to push (very hard!) and get to a stop. I did stop pass the light as it took me longer to stop the car, but luckily there were no cars ahead of me, nor any going through the intersection.

First I was backing out from a parking spot and almost hit a car waiting behind me because the car did not stop, I first did not think anything of it, I thought I did not step on the brakes well, but after while driving I noticed that it was hard to break at the red light. . . I decided to drive home, and my car would not stop and was rolling the stop signs, no matter how hard I stepped on the breaks the car would not stop!!!!!!!!!!!! this was very scary, I thought I was going to crash. I tried pumping the break and would hear some type of air coming out form underneath. They need to recall all of these vehicles! I could have killed myself or someone else crossing the street!! I am now afraid to drive it even though it is at the dealers getting fixed.

The brake pedal has become extremely hard and it doesn't stop quickly anymore. It feels like the brakes are going to completely fail and not stop the car. A car in front of me suddenly stopped to make a left turn and as I applied my brakes, they became very hard and took a very long time to stop, I almost rear ended the car ahead of me.

While traveling on the highway rush hour traffic my brakes started malfunctioning. The traffic ahead of my vehicle came to a sudden halt. I applied my brakes (100 ft. From collision), however, they failed to decelerate the vehicle- it didn't feel as though I had applied them. In order to prevent a collision I depressed the peddle with all of my strength (60 ft. From collision). Gradually, and insufficiently, the car began to decelerate. With the brake peddle fully depressed. Suddenly (25 ft. From collision) the brakes tightly grasped the rotor and the tires screeched- thrusting the passenger and I forward. Then the braked released and grasped again. The vehicle finally stopped inches short of a collision with the ahead of mine. For the past few days, the car has continued to exhibit similar symptoms. When I fully depress the break the vehicle makes a hissing sound and the rpms drop- on one occasion this action caused the cuv to shut off. I have to remain an additional 50 ft. Behind other vehicles in order to insure that I have sufficient time to stop.

I was driving about 40mph when I pressed on the brakes and it was hard and would not stop. I stepped on the brakes several times when it finally slowed down but it slowly rolled to a stop. After a few days of driving like this I knew to start breaking way in advance but now the car would suddenly turn off when at a complete stop while waiting at a red light. The whole engine would turn off and the engine light would turn on. I would turn the engine key off and then turn it on and the engine would turn on after the second try. I was freaking out every time if got into the car because I knew it would stop on me whenever I would stop at a long stop light. I finally took my car to a Mazda service center and they said it was the brake booster. It's been 5months and my car is running great. I hope this is the end of this brake booster nightmare because it was a really scary experience.

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.

I was driving to the grocery store with my two year old and my seven year old. When I applied my brakes at a stoplight my car did not slow down until I put both feet on the brake peddle and push with all my might. There was no warning light for a brake problem. The car was making a high pitch screaming noise when I applied the brake. My father who is an engineer check the car and found the brake fluid low and it had leaked into the booster and ruined it. I looked on line and found several Mazda owners had reported the same problem. My family, I and anyone else on the road lives are in danger if this is not recalled and corrected immediately.

Brake pedal became increasing hard to depress requiring an excessive amount of force to engage brakes. Stopping power decreased and distance to a full stop increased leading to very dangerous situations when driving the vehicle. Mechanic says the brake booster needs to be replaced.

I was driving my son to the doctors office when I realized the brakes did not feel right. I told my husband that I felt a lot of resistance when applying the brakes. So when I got home I had my husband drive the car and he said he did not feel anything until later that night when he was driving the vehicle he freaked out cause he said he felt as if the car wasn't going to stop after pushing on the brakes. He had to pull off of the highway and take the back roads home at a low speed and give himself plenty of distance from the car in front of him in order to brake so he would not slam into their car. Also, when applying all the pressure you could to the brakes, a loud hissing sound could be heard as well. The car was taken to our Mazda dealer where the car was purchased and after they looked at it, we were told that the vehicle had bad brake boosters and that we were lucky we weren't in an accident. After hearing this and researching it, it really upset us that Mazda has had this issue with the same model vehicle of other years. . . . Why hasn't a recall been done? are they waiting for someone to lose their life before something is done?! I thank god we were able to stop our car but there was no warning or lead up to this incident. It literally just happened out of nowhere!.

Upon light braking I hear a hissing sound. The brakes are ineffective at slow speeds. It takes a longer time and requires application of greater braking force to get the car to come to a complete stop. I took the car in for inspection and am awaiting the results. I saw online that there are known problems with the braking system.

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.