2012 Mazda CX-9: brake failure

Filed Feb 20, 2023 · Brakes · NJ

On August 14, 2020, the brake booster along with the master cylinder failed, resulting in very dangerous and frightening driving conditions, and the parts were replaced with Mazda original parts. This was an ongoing issue with the Mazda CX-9’s. I reported it to the federal safety agency, complaint number 11480067. On January 4, 2023, the brake master cylinder and booster failed again resulting again in very dangerous and frightening driving conditions. The car was driven only 25,383 miles before the brakes failed the second time. The Mazda parts were defective and continue to be so after many years with no effort by Mazda to improve these parts. Attached are the repair invoices for both incidents. I have tried contacting Mazda and they refuse to address the issue.

Filed Apr 29, 2021 · Brakes, Engine · 110,000 miles · TX

Tl* 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 was advised to reach out to the dealership eldorado chevrolet(233 n central expwy, mckinney, tx 75070). The contact wanted a second opinion and the vehicle was taken to eldorado 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 svc mgr informed consumer he wouldnt advised anyone to drive the vehicle until repairs were made. Due to incorrect title work the dealer refunded some money and took posession of the vehicle. The vehicle was not repaired. The manufacturer was not informed of the failure. The failure mileage was approximately 110,000. The consumer stated the vehicle was put back on the lot for resale. The consumer contacted a lawyer and vehicle was taken off the lot but carfax was not updated with correct information.

Filed Nov 4, 2020 · Brakes · 129,000 miles · CT

Tl* the contact owns a 2012 mazda cx-9. The contact stated that while driving at approximately 20 MPH, the brakes failed to operate. The contact mentioned that the brakes gradually slowed down the vehicle and stop independently. The vehicle was taken to an independent mechanic where they informed the contact that there was an unknown recall on the vehicle. The contact contacted riley mazda (75 myrtle ave, stamford, ct 06902, (203) 978-5780) and was informed that the VIN was not under recall. The contact was informed of an extended warranty coverage however, the mileage had been exceeded. The manufacturer was notified of the failure. The approximate failure mileage was 129,000.

Filed Oct 22, 2020 · Brakes · 84,894 miles · GA

I was on the interstate (driving 60+MPH) and the car in front of me slammed on their brakes for an unknown reason. I tried to use my brakes but they were rock hard and the pedal wouldn't depress. I was forced to swerve to the right, still having no brakes, and barely made it over 3 lanes to the shoulder of the road. In doing so, I caused total chaos around me, caused a tractor trailer to start to jackknife, which caused a chain reaction behind him. It was a total miracle that no accidents were caused and no one was killed. I called my mechanic from the side of the road, hysterical. He looked in his database and found that mazda had known issues with their power brake booster. I subsequently found a letter from mazda instructing owners "if your vehicle is functioning properly, there is no need to contact your dealer." are you kidding me???? My brakes were fine until they weren't, then I narrowly avoided being killed or causing the death of another because apparently mazda's body count wasn't high enough to issue a recall.

Filed Aug 24, 2020 · Brakes · 81,952 miles · MO

While pulling into my garage at low speed, my power brakes failed. I had to practically stand on the break pedal to get the vehicle to stop, barely stopping before hitting the fridge in my garage.the vehicle was towed for service and the problem diagnosed as the failure of the brake vacuum booster.

Filed Sep 25, 2018 · Brakes · 90,700 miles · NJ

Vacuum power brake booster failure, my brakes did not work and my car stalled. There is a warranty extension for this problem - not a recall - I never knew anything about it. A consumer must be notified of a recall but not a warranty extension but this is a very dangerous problem. I fear for the safety of others who may not know about the problem. If you don't know about it you do not ask to have it checked and when it fails you are in danger. I appreciate the warranty extension but I honestly think that I should have been notified. No one was injured and there was no property damage - I believe there should be some reconsideration regarding the decision not to issue a recall on this problem.

Filed Jul 3, 2018 · Brakes · 58,766 miles · CO

Virtually complete loss of braking. Quick onset. Apparently the same underlying defect as investigated in 2008-2011 (incorrectly closed) and in tsb #ssp93 the federal safety agency id #10117767. The dealer had the car in for another issue (recall) in march; but did not fix this issue (not allowed to speak of it -- unless the customer brings it up (personal communication 7/3/2018). The federal safety agency staff should have noticed that the 2012 tsb is essentially a continuation of the core issue from 2008 onward. A failing booster should increase the effort to brake, it should not be permitted to result in complete loss of functionality!

Filed Nov 1, 2017 · Airbags, Brakes · 75,000 miles · IN

Airbag safety recall, transmission switch failure, throttle body failure, brake failure

Filed Sep 8, 2017 · Brakes · NV

When braking the brakes are either hard and do not work or brakes are spongy, will slow vehicle, but will not give you confidence that they will stop the vehicle like they should. When braking at times you can hear a hissing, maybe all the time, but when things are happening you aren't listening for a hissing sound. Also, when the vehicle is stationary and in park if you really put you foot to the floor a beeping almost like an alarm sound is made. This brake booster failure should be a major concern. 8-13-2017 I was traveling about 65 MPH in lite traffic on a downgrade and slight corner when a vehicle in front of me lost a tire and I needed to brake quickly and my brake pedal wouldn't move, it was hard as a rock, never slowed the vehicle at all. Thank goodness I had plenty of room to maneuver, otherwise who knows what the result of that accident may have been. Another time was 8-30-2017 I was driving my vehicle, approx 20 MPH, and was approaching the intersection of our subdivision and the hwy where the traffic travels at 55 MPH, I went to brake and the pedal went to the floor.... Again no brakes. My vehicle rolled to a complete stop, but not before I crossed into the second lane of cross traffic. Again thank goodness it was around 6:30 am and traffic was fairly lite. Mind you this is only two of the more extreme times. I have purchased a new brake booster and it will be installed this weekend. I did try to contact mazda, but after sitting on hold, 1‑800‑222‑5500, for over 18 minutes the phone finally rings.....until it disconnects.

Filed Apr 19, 2017 · Brakes · 35,060 miles · HI

Brakes failed. Attempts to stop only slowed vehicle down unless extreme pressure applied. Pedal stopped halfway. Occasionally ABS activated due to excessive force required to depress brake pedal. Repair with replaced brake booster. Immediately failed again by making noise on depression though vehicular is stopping. Dealer ordering another booster and will need to return for repair again when it comes in.

Filed Aug 31, 2016 · Brakes · 101,000 miles · SC

Loss of brake fluid; brake pedal hard to push. Unable to stop car; hissing noise at brake pedal.

Filed May 19, 2016 · Brakes · 60,000 miles · SC

Brake failure at 60k miles (possibly earlier). I bought the vehicle from a dealer 2 months ago and was told front and rear pads and rotors had already been replaced. They felt inconsistent but I thought they needed to settle in. Then the power boost began to fail and a high pitched whining noise comes from the booster if the pedal is held down. It has lurched forward with my footrr on the pedal while at a full stop. I now put it in neutral when at a stop. Getting it to stop is the problem. Very ,very dangerous.