When pressing the brakes at any speed there was a hissing sound and the brakes were hard to press. regardless of the amount of pressure i applied to the brakes they did not react and it took the vehicle longer to slow down even at very low speeds (5-10 mph) or faster. this came on suddenly and caused me to bring the vehicle into the service department of the the dealership where i purchased it. the mazda technician inspected the vehicles and completed a diagnostics of the vehicle and discovered that the master cylinder and brake booster have failed and need to be replaced.
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.
I had 3 children in car seats, myself and my oldest son in our cx9. i crested a hill and started down the other side and i applied the brakes to slow down and they were hard and would not allow me to stop. i almost hit the truck in front of me. he was thankfully watching his mirror and ran a red light to get out of the way so i didn't hit him. after standing on the brakes for what seemed like a life time they finally engaged in the middle of the intersection and hissed with a loud squealing noise. i removed myself from the intersection and at 5 miles per hour went to the nearest mechanic. i was told to call mazda because the power assist braking system had failed. i called mazda and they told me not drive it as it was unsafe. they would have it towed to the nearest dealership and would take care of it. the nearest dealership is dolan mazda kia in reno nevada. i was informed by steve to look at it in the shop i was looking at $125. and that it was no longer under warranty because my cx9 has over a 100k mls. and the warranty ran out at 90k. the brakes failed unexpectedly with no warning. i was never notified about this safety issue from mazda nor the dealership i purchased it from. i see that the nhtsa has closed it's investigation with no recall or that mazda customers were informed. my family could have been seriously injured or even killed.
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. *tr
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.
Tl* 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. *tr
This is the second happened to my mazda cx9, 2011. the brake started to have hissing sounds while stepping on brake. the brake pedal is harder than usual to depress. the brake functions has been reduced around 30~50% less than normal. this has put deriving safety in jeopardized. this is the second time my cx9's brake booster failure. the first time is in year 2012. i worked with mazda to have brake booster replaced. however, dealer seemed not realized there is a warranty extended program from mazda --- mazda special service program -93 (ssp93). this is official recorded in nhtsa action number pe14005. dealer tried contacting mazda for this program. but mazda kept not responding, it has been two weeks but still not message back from them. i paid the repairmen of the defective brake booster (parts & labor) from my own packet at this point. despite the defective parts for jeopardizing driving safety, my complaints to mazda is also for their non-responsive to customer's warranty program which they have made.
I actually noticed when i started my vehicle up and pressed on the brake pedal, it seemed to slowly sink all the way to the floor and made a hissing noise. the noise only stopped when i took my foot off the brake pedal. as i was driving, on several occasions i had dramatically reduced stopping performance when applying the brake. i've gone through several stop signs and have almost rear ended other vehicles. this seems to have suddenly happened, i first noticed it on 3/1/15. this wasn't happening on or before 2/26/15. i suspect the power booster or master cylinder have failed, though i'm concerned that this happened with only 61,000 miles on it. *tr
Tl* 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. *tr
The brake booster failed. all of a sudden the brake felt hard and the car wouldn't brake - had to press very hard to barely avoid hitting another car in front. on the way to the dealer, it was scary and could have easily got into an accident. i am lucky it didn't happen on a highway. the dealer replaced the brake booster - it was under extended warranty but not recalled. though the dealer was quick to fix the problem, i believe this is a really dangerous and lives can be lost! i expected a defective braking system should have initiated a recall!!! *tr
Without warning, the brakes failed. they seemed locked to the floor, impossible to press. no signal indicators no warning. just suddenly no brakes. very critical problem and accidents involving loss of life is probable. *tr
I have been having issues with the brakes mostly when raining or snow. at times when i go to hit the brakes they get stuck or make a grinding noise and don't want to stop. this has happened numerous times and almost caused me to hit another car on multiple occasions. i will take it in soon to have it checked now that i see that i am not the only person with this issue. starting in jan 2015 i notice a burning smell coming from under the hood of the car. i had an oil change and checked for an oil leak to find nothing wrong with the vehicle. after running the car for at least 20 minutes the smell continues.
Brakes makes a hissing sound when you step on it and it is hard. updated 03/4/2015 *js
Tl* 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. *js
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. *tr
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. *tr
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. *tr
The brakes on the vehicle have become unpredictable. i initially took the car to my local shop only to be turned around being told that there was not enough wear on the pads to warrant replacement and that everything looked fine. however, being the owner of the car, i can confirm a severe and sudden regression in the breaking behavior. while the car still slows down when the breaks are applied, the pedal has become very hard and the ability to stop suddenly is severely comprised (even at a slow speed). i have to plan my braking point much further away from my anticipated stopping point which makes driving much trickier. i would not trust the vehicle to save me from a crash were i to require emergency braking. *tr
I was driving in my mazda 2011 cx9 suv when i pressed on the brakes and they would not engage. i had to press repeatedly, extremely hard in order to get the vehicle to stop. i have taken the car into my mazda dealer who is saying that i have a problem with the master cylinder leaking fluid into the booster. mazda has not sent a recall for the master cylinder only for the booster. this is a very dangerous situation and one that needs to be addressed before someone gets into an accident. this car is 2.5 years old and has 42000 miles and should not be having these problems. mazda needs to honor the repair and fix this problem. *js
Brakes failed to engage 3 times this morning, the first time failed to stop the suv so had to swerve to the center median and slightly hit the metal barrier. then going back home making a turn, brakes failed again to engage. seems this happened when making turns. brought to the mazda dealer, told them about ongoing investigation by nhtsa about mazda cx9 2010-2011 brake problems. they did a thorough check but could not duplicate the problem so nothing was fixed. it might be the brake booster. i'm afraid this might happen again, they said there was no recall regarding brakes for 2011 mazda cx9. hope that nhtsa forces mazda to make a recall. mazda has to fix this dangerous problem. *tr
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. *tr
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. *tr
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. *tr
My wife complained that the brakes didn't seem to be stopping the vehicle very well. i drove the car and almost had an accident. at slow speed the brake pedal was very hard to depress and made a hissing sound, but continued to travel slowly toward the floor. i limped it to the mazda dealer and i was told that the booster and master cylinder needed to be replaced. when i questioned the service manager about mazda's problems with cx-9 brakes, he said mine was the first one he had heard of. i drove away as fast, carefully and safely as i could. *tr
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. *tr
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! *tr
Similar to other complaints here, i recently started noticing hissing when i pressed my brakes....... i noticed that i was having a hard time coming to a complete stop. i took my cx9 in today august 14, 2013 to gunther mazda in fort lauderdale. i thought it was going to be a simple change of brake pads, little did i know i was in for $700!!!!!- apparently this is nothing new for mazda, there was an investigation going on by the nhtsa for the 2008 cx9 model and guess what? the 2011 seems to be having the same exact issue. the mechanic said the pads are fine but the master cylinder and booster need to be replaced. i'm going to call mazda usa to see what they can do but unless everyone starts demanding answers they're going to be laughing all the way to the bank. it'll take a strong effort to make them issue a recall. this is my last mazda. i'm going back to my lexus, more expensive by a lot but i didn't have to worry about putting my life and my daughter's life at risk. this is ridiculous. *tr
August 6th 2013 my wife complained about the brakes on her 2011 mazda cx9 making a hissing type sound and brakes feeling mushy and not responding as normal. the next day she advised the brakes were worse so we parked the car until the 9th. the cx9 has 46000. miles. the car receives regular maintenance and was taken to tom bush mazda (jacksonville fl.) for diagnosis of the problem. we were advised that the issue was a vacuum leak from the brake booster and it had to be repaired at the cost of $695.88. (part = $130. w/ labor $503.) we learned that others have had the same problem and that a recall might have been issued for the previous year cx9s. there was no consideration on repair costs. our issue is the brake vacuum booster failure seems to be an abnormally common complaint on mazda's cx9 vehicles and the fact that this involves brake failures, is a safety issue that may lead to a catastrophic crash at higher speeds. i believe other similar complaints noted about mazda cx9 brake issues in the nhtsa warrant a thorough investigation and possible recall. we will retain the defective part. further note, the mazda dealership released the vehicle to my father w/o properly inspecting their work. the vehicle was released to us w/o the brake lines being bled properly which caused the brakes to fail while at the dealership. it took another day to fix that issue. *tr
Our 2011 cx 9 brakes are failing. the power brake booster will at times not work making the brakes very hard to depress and without the ability to quickly and safely stop the car. *tr
I just stated noticing issues with my brakes, i started hearing a low hissing noise and noticed that i was having a hard time coming to a complete stop. i need to pump the brakes several times to slow down and then once stopped the brakes go all the way to the floor. i took my cx9 in today july 8, 2013 to have the brakes checked and the oil changed. i was told the breaks and pads are fine but there is something wrong with the brakes. they tried flushing the lines and that did not help. they told me they could not look at the car further until wednesday july 10th. i asked if the car was safe to drive they said it was and to go slowly upon reaching a light and make sure to pump the breaks so i can stop in time and not go through the intersection. this is very alarming to me since an accident can occur this is my only vehicle and i need to get back and forth to work. they told me they needed to call the mazda help line to find out what is wrong with the breaks. after researching on line today mazda cx9 brake issues am very interested to see what they say and if it is the same problem that has been reported since 2008 with this model. i am very upset since i take very good care of my car and always take it to the mazda dealer for service. my vehicle is at the 37,000 mark which appears to be the point when this has been a problem for other vehicles. i hope that mazda will cover the costs to fix the car and that i don't get into an accident between now and wednesday. *tr
Approaching a red light on a dry sunny day, my brakes failed halfway through coming to a stop. at first my vehicle (2011 mazda cx-9 sport with 56,000 miles) was slowing down normally and then suddenly there was grinding/crunching noises and despite pressing the brake, the vehicle was no longer stopping. i slammed the brakes, pumped a few times, and the vehicle simply failed to slow down or stop causing me to slam into the rear of the vehicle in front of me. i took the car into a mechanic who notified me that both of my "front calipers were possibly defective," and my front rotors were "uneven and wearing on the outside." however, my brake pads were good and did not need to be replaced. good thing i was already stopping for the red light; therefore i estimate going about 10-15 mph (speed limit on street was 35 and i was already midway through coming to a stop at the light). imagine if i need to brake while going 60-70 mph on the interstate! or worse, driving in the rain! *tr
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. *tr
Power brake booster failure. *tr