Brake Master Cylinder Problems of Mazda CX9 - part 1

The contact owns a 2012 Mazda cx-9. The contact stated while driving at various speeds, the vehicle stalled. Additionally, the brakes failed to engage when the brake pedal was depressed. There was no warning light illuminated. The vehicle was taken to an independent mechanic to be diagnosed. The contact was informed that the brake master cylinder and brake booster needed to be replaced. The contact wanted a second opinion and the vehicle was taken to el dorado Chevrolet (2300 n central expy, mckinney, TX 75070) where it was also diagnosed with the master cylinder and brake booster needing to be replaced. The vehicle was not repaired. The manufacturer was not informed of the failure. The failure mileage was approximately 110,000.

See all problems of the 2012 Mazda CX9 🔎.

Tl-the contact owns a 2012 Mazda cx-9. The contact stated that while driving, making a turn at 5 mph the brakes were squishy and the vehicle failed to stop. There were no warning lights illuminated. The vehicle was taken to bob moore Mazda 13045 n kelley Ave, oklahoma city, ok 73131 (405) 775-7000 where diagnosed the master cylinder needed to be replaced. The vehicle was not repaired. The manufacturer was contacted who stated the extended warranty had expired. . The failure mileage was 75,000. Ap.

First brakes started failing were soft had to pump them to stop in time as to not hit another vehicle. I took my car to my mechanic. He said we needed to replace the master cylinder. Did this now brakes make a whomp whomp sound and push back some. Was told to drive a few days and see if it gets better. Did this and hubby was driving they were soft again. Then I took car today it was fine until I got home to pick up kids to take them out left car running came in got my kids went back out to car. At this time brakes are now hard and you can't push them down. I put car I'm reverse and car didn't want to move almost like brakes are on safety bake is not on. I took around block to see if it would get better. It didn't in fact I barely made it up a small hill even with my foot to the floor with gas peddle. Got back to my house opened door and you could smell the brakes like they were burnt. Will be taking car back to machanic tomorrow. I know there has been problems with other years mine is a 2014 I don't think they have fixed or solved them. My car only has 71,000 miles on it right now. Note when I say car I am meaning SUV. My car when it first happened mushy brakes was in motion on road not freeway thank goodness. The second problem was not in motion to begin with then was in motion.

See all problems of the 2014 Mazda CX9 🔎.

The brake pedal became very hard to push. I assume it could be the brake power booster or brake master cylinder.

See all problems of the 2010 Mazda CX9 🔎.

Applying brakes for 1-2 seconds resulted in no immediate stopping, only resistance from the pedal. After 1-2 seconds, the brakes were aggressivly applied. This resulted in "running a stop sign" and stopping the in middle of an intersection. This occurred on a city street multiple times before getting the car to a repair shop. On highways, braking had to begin well in advance to avoid possible crashes. We had to have the master cylinder and brake booster replaced. The vehicle has 55k mile on it.

I put my vehicle in the Mazda shop last year 2017 for a recall and I mentioned that there was something I felt in my brakes they told me that it may be dust and by driving it will go away,Mazda knew about this problem they should have taken care of it then. My vehicle was taken to ourisman Mazda dealership about 2 weeks ago and I was told that it was my brake booster & master cylinder labor is $709. 47 and the parts are $537. 98 and the brake flush is $202. 61 total $1450. 06 and my warranty expired in October 2018. I then called Mazda and I spoke to a ms. Jennifer a customer experience representative and she said she would check into it. I then called back to ourisman Mazda and spoke to mr. Emerson and he told me that he spoke to ms jennifer at Mazda and that my out the door price would be $553. 16 and they have already ordered the part ,they stated Mazda called off the recall and did a 7 year warranty or 90,000 miles my car is neither of them for a 2012, then they wanted to say its because when my car was purchased? then to tell me that when I put my car in last year for a recall if it was not making a problem they were not going to look for one? on these roads,my children,my grand children and the lives of all people I,and I'm sure a lot of people feel . I have been sick and without a loaner car and this is unexceptable I would greatly appreciate your help with this problem. My contact person with ourisman Mazda is mr. Emerson 240-863-2429 and my contact info for Mazda customer rep is jennifer 800-222-5500 prompt 2 then ext 1133 (1-1930090754) the recall needs to be put back on, I was never notified that there was a extended warranty. This can result in serious injury or death,how dare them put a price on this.

Vehicle has 57000 miles had to put intwo master cylinders in two years. Auto was in motion and complete loss of brakes.

Power booster master cylinder failure. First, spongy pedal attributed to master cylinder with no fluid present. After refilling hydraulic fluid, pedal was better for a day or two then loud noise coming from cabin in vehicle when pedal is depressed. (it goes to the floor and becomes very loud. ) sounds like an identical problem to earlier model year.

The contact owns a 2012 Mazda cx-9. While driving various speeds, the brake pedal was depressed and failed to engage correctly. The pedal felt stiff and there were no warning indicators illuminated in the vehicle. The vehicle was taken to an independent mechanic who diagnosed that the brake booster was faulty and there was a leak in the master cylinder that needed replacement. The vehicle was repaired. The manufacturer was notified and opened a case. The VIN was invalid. The failure mileage was approximately 100,000.

At just over 90,000 miles I had transfer case problem that everyone is posting. As described by mechanic it is a manufacturing defect. Transfer case is placed just above catalytic converter (which throws off alot of heat) as a result oil in transfer case cooks over time and gears are destroyed. Mazda did not provide a way to replace and or check this fluid without taking down the entire transmission. Mechanic said I will have this problem again at roughly another 80-100,000 miles. Year and a half later I noticed a very soft brake. I replaced brake pads and drums, and brake fluid. I have a very hard brake which then sporatically goes soft. Again I looked up this issue and found again Mazda is aware of this issue and extented warranty to 90,000 miles. Again I'm just over the warranty allowance and now my brake power booster and possibly master cylinder need to be replaced. Both are known issues by Mazda. Unfortunately I was the lucky one who was the beneficiary of both problems just over the 90,000 mile warranty. I reached out to Mazda to request some assistance with at least the cost of the parts on the brake power booster. I was given a quick no by Mazda. Very frustrating since these are both known problems and they will not at least work with me on the parts cost.

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).

See all problems of the 2011 Mazda CX9 🔎.

I had to push harder and harder on my Mazda Cx9 brake pedal for my car to slowdown and to come to a complete stop . This happened when backing out of my garage and the brake is getting worse everyday on my way to work . On the day when I had to take my car to the mechanics , I had practically put both feet on the brake pedal for the car to stop . It was a terrifying experience that the car would not stop and continued to roll forward and more so at every traffic light . I took my car to two different mechanics within one hour since I didn't believe the first one and wanted a second opinion . They both told me that the brake booster and the master cylinder were defective and needed to replace immediately because I just don't have brake on my car ! they said this should not happen in a car with only 59,000 miles . The first mechanic even had me signed a waiver since I didn't want them to fix the brake and wanted a second opinion . I did not believe that it would cost me $1062,07 to fix the brake . Unfortunately the second mechanic gave me the same diagnostic with the cost of $843 and two days to order the parts since it was on Saturday and recommended me to leave the car in their garage . And to make the thing worse my Mazda dealer service is not open on the weekend . I googled and found out that the defective brake has had happened to several other Mazda cx 9 owners and no recalls had ever been issued . I do have photos of the defective brake boost and master cylinder but don't know how to upload .

Poor braking which Mazda recognized as a brake booster and master cylinder problem but never notified its cx-9 customers to go to the dealership to have the repair done.

Braking power booster system failed while driving. My booster brake and master cylinder went out suddenly and there were no warning lights. When applying full pressure on the brake, a loud hissing sound could be heard on the highway. In order to make a complete stop, I had to press the brakes far in advance of my stopping point to ensure the vehicle completely stopped in order to avoid hitting the vehicle in front of me. After this happened, I immediately drove the vehicle to my closest trusted mechanic (tires plus) to have the booster braking system inspected, and inevitably replaced. Tires plus completed the repairs and told me about another unrelated recall issue and recommended I take the vehicle to my closest Mazda dealership (classic Mazda orlando) to have the recall done for free. When I made the appointment for the unrelated recall item, classic Mazda informed me that the braking booster system that I just had replaced by tires plus was actually a warranty issue that Mazda corporate would have repaired at not cost. Classic Mazda suggested I file for reimbursement with Mazda corporate. Upon filing for reimbursement with Mazda, I waited about 4 weeks and then followed up with Mazda to confirm the date I should expect delivery of the check. At that time, they informed me that I was not entitled to full reimbursement because I should have taken or had the vehicle towed to my closest Mazda dealership for repairs. Not having any knowledge of the braking system warranty and fearing for my safety, I proceeded to have the repairs done immediately. All I want is for Mazda to fully reimburse me for the repairs and not just for "reasonable repair costs. " this could have turned out much worse had I gotten into an accident, so shorting me $177 is a battle that I should not have to fight with Mazda corporate.

Master cylinder leak causing the brake booster to go out as well. Suspension weak and rusty. Mazda refuses to address the problem.

See all problems of the 2008 Mazda CX9 🔎.

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.

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.

We experienced what similar Mazda Cx9 owners have reported: our brakes stiffened, provided resistance coupled with a hissing noise, and failed to stop the vehicle in a timely manner, despite having a full brake fluid reservoir and sufficient brake pads. Our mechanic reports failure of the master cylinder and the blower. We experienced these events suddenly and while the car was in motion.

My wife was driving our cx-9 with our kids on Saturday when the brakes failed. This prevented her from braking at a red light. There were no dash warning lights prior to the incident. The brake fluid was at a recommended level since the vehicle is well maintained. We towed the vehicle to the local Mazda dealer (where we originally purchased the vehicle). On removal of the brake booster the Mazda dealership found the brake booster failed because it was full of brake fluid. On closer inspection they found the brake master cylinder was cracked which led to the brake booster filling up and causing the brakes to fail. They said the brake master cylinder was not covered under the factory recall since this issue only happens to 2010-2011 model year cx-9's even though our 2008 cx-9 exhibits the same exact brake master cylinder defect. The brake booster was covered under the factory recall (from Mazda notes: perform manufacturers recall ssp93 power brake unit warranty). The only thing that prevented a major accident was this happened early on a Saturday morning with light traffic. If this would've happened Monday-Friday at the same time if would've been a severe accident since it's a very busy intersection during the work week. I truly believe this should be investigated for the 2008-2011 Mazda cx-9's.

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.

Vehicle lost braking power. Vehicle was being driven (infant inside) from chicago to evansville, in when brakes starting to respond in a delayed manner from when brake pedal was actually pressed. By next morning the vehicle did not brake. Mazda dealership checked the vehicle and mentioned that somehow â¨master cylinder and booster failedâ¨with no apparent reason as they were able to tell no abusive or incorrect use was applied to the vehicle. Mazda will replace parts that failed to work but it placed my family in a very dangerous situation.

My brakes have started making a hissing sound and brakes are hard when pressed. I experienced a similar issue with a 2008 Mazda cx-9 in which the master cylinder and brake booster had to be replaced. I now own a 2012 Mazda cx-9 and am experiencing the same problem. I took it to the dealer may 14th, 2014 and they said it was fine. It now has gotten worse as of June 22, 2014, to the point the brake is very hard when depressed and takes several car lengths to come to a complete stop. Mazda needs to address and fix this issue with this model if they want to keep their customers. They did extend the brake booster warranty for this problem specifically but they need to correct and improve the brake system in their newer vehicles to maintain the safety for their drivers. I am already considering a different make and model for my next vehicle. I have always been happy with my Mazda but no longer feel safe driving it and feel dissatisfied having experienced the same problem in this model that are 5 model years apart. You would think they would do better to improve the brake system, a major safety feature for a family vehicle.

The contact owns 2012 Mazda Cx9. The contact stated the brakes would hiss when being depressed. The contact also stated that there was an abnormal increase in braking distance and time. The vehicle was taken to the dealer for diagnosis, who stated that the brake booster and possibly the master cylinder would need to be replaced. The vehicle was repaired. The manufacturer was not alerted of the failure. The failure mileage was 35,000.

Brakes not working properly, reduced brake effectiveness, hard pedal and not stopping properly, and a definite constant hissing when applying the brake pedal. Possible master cylinder issue. Mazda Cx9, 2012. Very similar to complaints and ongoing investigation, except for this is a 2012.

The vehicle stalls when idling at a stop light or in a a drive thru. The vehicles motor begins to shake and then eventually dies and stalls out and the vehicle must be started again with the turn of the ignition. The braking system is also defective. When at a stop light and your foot is on the brake pedal. The pedal suddenly sinks as if the brake fluid in the master cylinder has drained fully and the brake pedal sinks all the way to the floor and the vehicle shoots forward even if your foot is on the brake. Another problem is in the power door lock system. There has been a time when the power door lock was stuck and the rear right door could not be shut. I had to drive the car to the dealership with the car door flopping all over the place. They were able to fix it at the dealership but could not figure out how it occurred. They were as puzzled as I was. The car was bought back in 2010 brand new from the Mazda dealership. The reviews were good for the vehicle. Its the first Mazda we purchased and is probably going to be the last.

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.

Brakes would not work as usual. After "stomping" on brake, car continued to move for several feet. There were no warning lights of brake failure whatsoever. Took vehicle to dealer to be informed the master cylinder and brake power booster were out and the car was dangerous to drive. Very glad nobody got hurt. Couple issues: this brake failure is fairly widespread with this make/model/year as I've found from research. Why is there no recall? there's not even a technical advisory from Mazda about this serious threat to drivers of this car. Does somebody have to get hurt first? second, I get that parts go bad - but on something as important as the brake system, the car should sound some sort of alarm, light a dummy light. . . . Something to tell the driver to stop driving the car as they are in imminent danger. To not address at least this second issues is neglectful of Mazda and the ntsb. To not address the mechanical failures by way of recall is also extremely negligent.

On Friday, October 18th 2013 I was involved in a near accident on my way home from work on interstate 99 off the 17th street exit near altoona PA. The brake system failed as I tried to come to a stop on the exit ramp. I placed my foot on the brake pedal and noticed I was not stopping. I could hear a hissing/air sound when I pressed down on the brake pedal. I had to pump the brakes, gear the car down in manual, and swerve off the road to avoid crashing into the car that was stopped in front of me. No dash lights were on giving me no warning that there was anything wrong with the brake system in the vehicle. Ii took my vehicle to the local Mazda dealer and found out that the cause of the brake failure was a leaky master cylinder and that ruined the brake booster. I brought my car to my local dealer in good faith to see if Mazda would replace the parts or at least provide the parts to fix the car since there was a prior investigation into the faulty master cylinders. I then was informed by the service department that their Mazda representative has not heard of any investigations into the faulty master cylinders. So I contacted Mazda directly via the customer service number. I spoke with a [xxx] and my complaint was filed with Mazda documentation number 149440377. I was then informed that Mazda was not willing to replace the parts needed to fix the car as the dealer's service department said the car was unsafe to drive. Total cost to fix the vehicle was $2300. This vehicle needs recalled and the faulty master cylinders need to be replaced by Mazda before someone get killed. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

See all problems of the 2007 Mazda CX9 🔎.

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.

Tl- the contact owns a 2010 Mazda cx-9. The contact stated that the brakes would sporadically fail. The contact had to continuously pump the brakes in order to stop the vehicle. The vehicle was taken to the dealer where it was determined that the master cylinder and brake booster needed to be replaced. The failure and the current mileage was 42,000. Kmj.

Brake system failure involving master cylinder and booster. Leaking internally. Replacement cost of $1500 researched Cx9 and found this problem is widespread and not being addressed. We had a minor fender bender that could have been much worse. Mazda USA has not issued any bulletins as of yet.

In June of 2012 I noticed that my brakes made a hissing sound at random times. I brought the car into the dealer for a complete service and brake check. I was told that the breaks were in perfect condition but they did do a brake flush. The hissing continued at random time until the week of 1/13/13 at which time the hissing was at every occasion the brakes were engaged. And on 1/15/13 the brakes failed to stop the vehicle. I brought the car directly into the dealership and was informed that it was a leak in the brake booster into the master cylinder. After researching this I have found that this is a common malfunction with the Cx9 and I am extremely frustrated. Although Mazda acknowledged the issue on earlier models they are not acknowledging the issue on the later models. They should have to stand behind the parts and vehicles that they make. And when they know that a certain part or system has a history of failing they should take responsibility for the issue instead of making their customers pay for their mistakes and faulty parts.

I have a 2010 Mazda cx-9 with approximately 41,000 miles. I have been diligent in my maintenance-always with a Mazda dealer. The car started to exhale slightly when braking. The car then did not want to brake/stop without pumping the brakes repeatedly. I was able to stop suddenly but unable to stop without ample warning at stop signs, etc. The vehicle was taken to Mazda dealership where they told me that the vacuum booster and master cylinder were defective. I was not allowed to drive the car because it was not safe. They then told me the next morning that Mazda/dealership found no warranty covering such a malfunction/factory defect b/c I had passed the 36,000 miles mark. I will have to pay $839 for a repair to drive my car that is an issue with the manufacturing of my car. The dealer told me I must contact Mazda USA directly to see if they will pay for it-otherwise I am responsible. I have read other complaints and an article in the wall street journal both sitting the existence and experience of this malfunction. The NHTSA was said to be investigating the issue. Mazda should be forced to recall the vehicles and fix the malfunctioning brake system. It is not the fault of the consumer but of the car manufacturer.

The contact owns a 2008 Mazda Cx9. The contact stated that when the brake was depressed, the brake pedal would become stuck to the floorboard and caused an increase in stopping distance. The vehicle was taken to local mechanic whom inspected the vehicle and located the failure at the power brake booster master cylinder. The vehicle was not repaired. The VIN was not available. The approximate failure and current mileage was 190,000.

The contact owns a 2010 Mazda cx-9. The contact stated that while driving 25 mph, there was a delay in stopping distance once the brakes were engaged. The contact mentioned that he had to depress the brakes repeatedly in order to bring the vehicle to a complete stop. The vehicle was taken to an independent mechanic who diagnosed that the vacuum booster and master cylinder were defective and needed to be replaced. The manufacturer was not made aware of the failure. The vehicle was not repaired. The failure mileage was 50,000 and the current mileage was 50,040.