Brakes really hard to press. wife thought car wasn't going to stop and she was going to rear end car in front of her. sometimes brake pedal would feel spongy. over last month there was an intermittent strange noise sometimes when car was started. mazda dealership identified the problem to be a defective brake booster. i found that nhtsa opened investigation on cx-9 brake issues previously and mazda identified problem to be brake booster. mazda extended the warranty to 7 years or 90,000 miles and nhtsa closed investigation. our brake booster failed at 9 years with 79,388 miles on the car. from what i have read the life expectancy of a brake booster is the life of the car. mazda never informed us about this possible problem. our family could have been seriously injured or killed due to this defect. why did the nhtsa accept an extended warranty as a solution?
Tl* the contact owns a 2011 mazda cx9. the contact stated that while his wife was driving approximately 13 mph and attempting to slow down, the brake pedal was harder than usual to depress. as a result, the driver rear ended the vehicle in front causing a five vehicle collision at a traffic light. none of the frontal air bags deployed. the police were present and a police report was filed. there were no injuries reported. the vehicle was towed to an impound lot where the insurance company was scheduled to have an inspector inspect the vehicle. the vehicle was not taken to the dealer for a diagnostic. the vehicle was not repaired. the manufacturer was not notified of the failure. the contact referenced nhtsa action number: pe14005 (service brakes, hydraulic). the vin was not available. the approximate failure mileage was 86,000.
Our vehicle has lost braking power and is unsafe to drive any distance now. it is very difficult to get the vehicle to stop and keep it stopped once it has stopped moving without putting it in park. i have been advised this is in relation to mazda ssp 93. mazda has advised that is it my responsibility to have this vehicle towed to the nearest dealership, pay for repair labor, and pay for a rental car while repairs are being made. i am in complete disbelief that a known manufacturer's defect related to braking and general safety of everyone on the road was not immediately issued as a recall. we were provided zero notice that there was even potential for brake failure.
When trying to stop at an intersection, the brakes did not respond as usual. even with pressing the brake pedal as hard as i could, the stopping distance increased by at least 30 feet which placed me in the middle of the intersection. this is worse in hot conditions. there is also a hissing noise when the brake pedal is depressed. this continues to happen and does not feel safe to drive. a mechanic said it may be the power brake booster. i noticed that this was investigated, mazda issued a special service program which ended in 2015. the letter issued at that time said it was not necessary to take action unless there was a problem at that time. mazda should extend the service program because this is clearly a safety issue.
I noticed a significant problem braking on my cx9 to where i had to almost stand on the brake pedal to stop. added brake fluid hoping that would help but did not. took it to mazda dealership in buford,ga and they confirmed the brake booster was causing the problem and strongly recommended replacement asap. they explained the problem is a known issue and mazda extended the warranty to 90k miles. the problem for me was my '11 cx9 had 107k. i had no choice but to pay to have the problem fixed due to my personal safety. a couple days later i called mazda customer experience and voiced my disappointment that this part was never recalled and people are driving around in unsafe cx9's. they did confess that if i would have called them 'before' my repair they could have reviewed the issue and perhaps offset some of the cost. this left me very disappointed since they would have preferred i kept driving the car and risked injury to others while they reviewed the case. #cx9sadness
Brake booster failure
In dec. 2018, i had my 2011 mazda cx-9 to a mazda dealer service shop for what i felt like a spongy brake pedal. when i picked up the car the service advisor told be there is nothing wrong with the car's brakes. after a few months, while the symptom persisted, i found out there is a know issue with the brake booster, which mazda acknowledged and issued a warranty extension (which is expired now). two days ago, while traveling in traffic on highway, i had to stop the car due to a sudden traffic jam and i felt the brakes being insufficiently effective to stop my car safely. as such, i pumped the brake pedal 3-4 times and that caused the pedal to become very hard and made matters worst- to a point where i had to pull on the shoulder to avoid rear-ending the vehicle in front of me.
Tl* the contact owns a 2011 mazda cx-9. the contact stated that there was an intermittent failure with the brake system failing to function properly as the contact had to press the brake pedal, release the brake pedal and apply force to stop the vehicle. the failure happened more than once to the point of it being a risk that may result in a crash. in addition, the vehicle stalled. the vehicle was unsafe to drive, parked at the owner's residence and may need to be towed for repairs. the dealer young mazda (191 commerce park dr, easton, pa 18045, (610) 991-9100) was notified of the failure. the vehicle was not diagnosed. the vehicle was not included in nhtsa action number: pe14005 (service brakes, hydraulic). the manufacturer was notified of the failure to determine if they had a technical guideline to repair the vehicle. the vin was not available. the approximate failure mileage was not available.
Difficulty pushing the brake pedals and achieving a full stop. sometimes car would inch forward when brake applied. sometimes hearing a hissing noise when trying to apply the brakes. the noise seemed to come from the area of the brake pedal. overall, brakes did not appear to be working as intended. primarily experienced at lower speeds. has happened repeatedly over a few weeks.
I started noticing it was taking a long distance for my vehicle to come to a stop. i took it to my mechanic. we took it for a test drive and he confirmed there was a problem with the power brake booster. when he was driving, if he pressed on the brake pedal hard, he could make the car have a long "beep" sound. otherwise, he, too, noticed the long distance required for the car to stop.
Mazda cx-9 2011 has un-detected water pump leaks which cause to engine overheat and eventual engine death. mazda corporate is unwilling to co-operate. car suddenly came to a halt showing engine light on..and i had to replace the brake booster also because when i was driving the vehicle it turn off on me everywhere and i had to pay out of my pocket and im still paying for this vehicle right now my vehicle is in a garage because is not drivable
Brake pedal is rock hard and takes immense pressure to press down to get brakes to engage. hissing noise coming from under dash it seems.
Loss of power brakes. excessive brake pedal pressure needed to stop vehicle. hissing noise when depressing brake pedal.
I was approaching an intersection where i needed to stop with my children in the car, i went to hit my brake pedal and it was stuck in the up position and i couldn't stop, i had to quickly turn my wheel to hit the shoulder of the road to slow down and to avoid being hit in the intersection. the car brake then eventually released after hearing a hissing noise and it slowly going into the down position. when i had a mechanic look at it, he explained that it clearly is a failure of the brake booster. we researched it and found that similar issues happened with my make and model in the past but mazda does not want to honor the defect as its special service call on it ended in 2015.
Uninformed about the 2011 mazda cx9 brake problem which did not show up until 8-22-2018, i was informed that while mazda extended their warranty, the warranty had ended in 4-2018 or when the car had 90,000 miles logged. (my car is at 91,244 miles.) the car is unsafe to drive, the brakes are suddenly not working, and this is a documented problem with my make, model, and year. there is no more important safety feature in your car than the brakes. yes, teenage drivers ' that's even more important than bluetooth connectivity. unfortunately, owners of the 2010-2011 cx-9 have been having problems bringing their car to a stop. the brake symptoms cx-9 owners, especially those in hotter climates, have been telling harrowing tales of brake problems centered around: the brakes became hard to push, there was a hissing noise from the pedal and the car would not stop until the brake petal was pumped.
Brake peddle stiff, makes hissing noise. at times while in traffic loss of braking ability happens.
The brake start losing power and need to push really hard to stop.. and also make losing air sound when push on brake
Current mileage: 125707. noted brake fade, insufficient braking response during normal city driving. the vehicle was towed to a location to have the brakes examined. new front rotors, calipers and brake pads were installed. brake system bled and vehicle test driven. normal braking during speed tests of city driving and emergency braking. vehicle then driven for 2-3 days of normal operation. operator driving the vehicle and when braking to a stop on approach to an intersection noted the brake pedal went to the floor before vehicle would slow. the pedal had to be pumped to obtain a measure of brake response. the vehicle took longer to slow to a stop. also noted during braking was a "hissing" noise when depressing the pedal. pedal was then pumped up on approach to any anticipated stopping point. vehicle taken to be checked for possible air in the brake lines. brake system checked for air in the brake lines and none found. taken to a third-party shop for analysis. it was determined that the mazda oem power brake booster had failed and per the mechanic (note attached pdf) the diaphragm had become "brittle" and the brake power booster failure caused the "hissing" noises and the brakes to be causing the brakes to become unresponsive. the oem brake booster had to be replaced. during a review of online information it was discovered that the nhtsa had conducted an investigation into the issue of master brake cylinder leakage regarding this generation of mazda brake boosters. the vehicle has been in to a mazda dealership for prior recall replacement of other defects, however this potential defect was not addressed.
My brakes did not respond as they normally would upon application of the brake pedal when approaching an intersection on thursday morning. it felt almost like there was a pillow under the brake pedal. this occurred once on thursday morning, and once on friday afternoon. friday evening brake fluid was filled to ensure that there was not a lack of fluid causing the problem, however the problem again occurred several times on friday evening after adding brake fluid. by saturday morning it was worsening both in frequency (occurring with every application of the brake) and severity (felt as though no matter how long and hard i applied pressure to the brakes it would not perform in a manner that would be effective in anything other than very slow speeds with excessive space between all vehicles). on saturday it also began making a hissing noise which occurred as i was depressing the brake pedal, then stopped when the brake pedal was finally fully depressed (which took an extraordinarily long time). i felt it was no longer safe to drive other than to get it to our mechanic which i did on monday morning. our mechanic tested it and determined that the brake vacuum booster had failed and had to be replaced.
Notice while on line for gas, maintaining foot on brake pedal car began to move forward and had to apply more foot pressure. car has 690000 miles and over 7 years old. in park while depressing the brake pedal can hear a hissing sound. symptoms getting worst, braking distances are longer and takes more pedal pressure.
Tl* the contact owns a 2011 mazda cx-9. while driving at an unknown speed, the brakes failed to respond when the brake pedal was depressed. there were no warning indicators illuminated during the failure. the dealer was not contacted. the vehicle was taken to an independent mechanic where it was diagnosed that the brake booster failed. the vehicle was repaired. the manufacturer was notified of the failure. the vin was unknown. the failure mileage was 120,000.
Brake booster failure, causing brakes to not engage without pumping the brake pedal. no check engine or maintenance lights were triggered due to the failure. only indication was engine revving while idle for no apparent reason and inability to bring the vehicle to a stop.
Tl* the contact owns a 2011 mazda cx-9. while driving 40 mph, the brake pedal was depressed, but was extremely firm. the contact stated that gradually the brake pedal traveled to the floorboard before the vehicle was able to be stopped. the vehicle was taken to cardinaleway mazda-peoria (8424 w bell rd, peoria, az 85382, (623) 738-0755) where it was diagnosed that the brake booster and brake booster switch needed to be replaced. the contact stated that the vehicle was currently at the dealer to be repaired. the contact stated that the failure was intermittent. the manufacturer was notified. the approximate failure mileage was 74,000.
Lost braking power. pedal has to go to floor to work.
Brake booster failure brake pedal hissing and started to stiffen i was driving then stopped at a traffic light noticed that the brakes were hissing and was really hard to push on to a complete stop
Sitting at a stoplight, my brake pedal came up and the car died. restarted it, and it ran fine. happened again at a stoplight. i took it to a shop who said it was a "mazda" issue . within a week, my brakes started to not work. i took it to mazda & they told me i was past the 90,000 extended warranty. i asked them why they wouldn't honor fixing it when it was a mazda issue and they just said i was past the warranty. beware of buying a "certified used car"! warranties/recalls will not be sent to you!
Tl* the contact owns a 2011 mazda cx-9. while driving, the brakes were applied and failed to respond. additionally, the brake pedal became hard to depress. the local dealer was not contacted. the vehicle was not diagnosed or repaired. the manufacturer was not notified of the failure. the failure mileage was 60,000. *cn
Stiff pedal. no brakes
My cars brake pedal suddenly became stiff and would not stop my car. i had to swerve to prevent myself from rear ending the vehicle in front of me. at the next stop light i was extremely cautious and after i finally stopped, as i waited for the green light the car began idling oddly then it stalled. was able to start it back up. it seems to be shifting a little oddly too. very scary driving my car. incredibly lucky we weren't injured nor was anyone else. will have it towed to the shop to be safe.
Tl* the contact owns a 2011 mazda cx-9. while driving approximately 30 to 40 mph, the contact engaged the brake pedal and attempted make a left turn, but the brakes failed to engage. the contact was able to steer the vehicle onto a dirt road to bring the vehicle to a stop. the vehicle was towed to the hyundai mazda dealer (14821 pandelli road victorville, ca 92392 phone 760-241-3801) where it was diagnosed that the brake booster failed. the manufacturer stated that the brake booster failure was not warranted for 90,000 miles. the vehicle was not repaired. the failure mileage was 90,000.
Had a problem a few years ago related to the traction control system as indicated by the warning light appearing on the dash. dealer contacted the warranty department to file a claim and said that is would not be covered under warranty because they felt it was due to dirt and not a faulty sensor. the dealer never confirmed one or the other. second issue is related to a hissing noise coming from the break peddle. research suggested mazda was investigated by nhtsa back in 2014 and instead of a recall, mazda issued and extended warranty for 7 years or 90k miles. unfortunately my vehicle is within the 7 years but not the 90k. i am currently at 97k miles. still waiting to see if mazda will cover the repair or at least discount it.
While driving in the city or on highway suddenly the brake pedal becomes hard to press and creeps down to floor with loss of brake booster, a hissing noise is heard in the car and it becomes very hard to stop the vehicle
A strange, hissing noise coming from the pedal area. i am having a hard time pushing the pedal during 'initial pedal application', but that effort diminished as the pedal was pressed further while driving. the brakes booster squeals very loud if you push the brakes down while not moving. i did some research and found this is a defective brake booster issue that mazda had confirmed.
Brake master cylinder hissing and squealing while engine is in idle. after revving (and releasing) to 2000 rpm's and applying (holding) brake pressure simultaneously, the build up vacuum pressure does not allow engine to return to idle rpm. rpm hangs at 1500 rpm's. if vehicle is in drive while accomplishing this then the brake pressure applied is not enough to bring the vehicle to a stop. after find the cause of the issue i went online and found previous message boards about this issued were posted in early 2014 but a recall was never issued. reported the issue to mazda (20161012) but was told that since the vehicle is 30k outside of the extended warranty then the issue belongs to the consumer. (mazdaref 1-368-227-539).
As i was driving my car on a city street, i lost all steering and braking ability. the first time it happened - mazada thought it was a suction from the brake and a tube that was broken. however it just happened again as i was reversing in a parking lot. the car is now with mazada being looked at...
Driving from work today on a highway behind an electric truck that stopped abruptly, i applied my breaks kind of quickly and after stopping and taking off again when trying to apply brakes to slow the peddle would be really hard to press and it felt like the peddle was pushing up against you. there is a hissing noise when brake is applied and if you press the brake all the way to the floor there is a squealing noise. the hissing noise is inside the care and sounds to be coming from around the brake peddle area. the car can not be drove at this time because when in movement the brake is really hard to press and it takes very long distances to get stopped. i can't put my children in this car to go anyplace!
There was a ratal sound anytime i would go over a bump or dip at any speed. the ratal got louder. i went to my mechanic and he said the calipers in the front had to be replaced. specifically the driver's side it looked worn and there was rust so he thought moisture had got into the calipers. thought this was unusal. so both had to be replaced in addition to my brakes. it also caused my brakes not to function correctlyl.
Reference ssp93 - brake booster diaphragm leakage on 2010-2012 mazda cx-9 vehicles. on, or about august 5, 2016 power brakes failed, causing a need to apply heavier than normal pedal pressure to stop vehicle, resulting in very near rear-end collision with vehicle at stop sign. this defect is known by the manufacturer and was investigated by nhtsa in 2014. investigation was closed with no recall action recommended. there should indeed be a recall mandated for this defect since it can result in serious collisions due to failure to safely stop vehicle.
Loss of brake fluid; brake pedal hard to push & not stopping car; noise at brake pedal
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.
Hissing sound when applying brakes, brake feels stiff. have an appointment tomorrow (they said it should be ok to drive until then), said it was probably the master cylinder failing.
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.
Hissing noise when pressing brake pedal. if feels like more force is needed to stop vehicle. loud noise from transmission when shifting from part to drive/reverse
When breaking i hear a hissing noise and found out my break boaster was going bad.