2012 Mazda CX-9 brakes problems

Related recalls

No recalls on file.

What owners say

1. Filed Sep 29, 2023ORBrakes

   I was driving normally when I started sowing down and noticed the brakes were harder to push. I finally stopped just before almost rear-ending a vehicle in front of me. It turns out the brake booster, a known problem that was not communicated to me a few years ago, failed and makes braking the vehicle harder, increases distance, and makes the vehicle unsafe to drive. The problem has been reproduced via a diagnostic test at Mazda of Gladstone dealership on 9/27/23. The…

   NHTSA complaint #11547325 · source
2. Filed Feb 20, 2023NJBrakes

   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 NHTSA, 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…

   NHTSA complaint #11508193 · source
3. Filed Aug 18, 2022NJBrakes

   The brakes suddenly became very difficult to press as if I did not have power brakes. No warning lights came on and it became very difficult to stop the car. Then if I had to break suddenly and hard it would stall. I brought it to the repair shop and the brake booster was defective. The brake booster along with the master cylinder had to be replaced. It was a very dangerous and frightening experience the brakes suddenly difficult to use. I contacted Mazda customer service…

   NHTSA complaint #11480067 · source
4. Filed Mar 28, 2022VABrakes

   This is relating to NHTSA Investigation PE 14-005. Although this car is a 2012 Mazda CX9, my wife driving the car had the same issue where she heard a hissing noise and the brakes were very difficult for her to depress or to stop. A brake issue is a major defect where the NHTSA should have initiated a recall in accordance with 49 U.S.C. 30118-30120, which required notification of all owners. Why the NHTSA allowed Mazda to only issue a 'Special Extended Warranty' is beyond…

   NHTSA complaint #11458648 · source
5. Filed Oct 5, 2021NJ1 injuredBrakes

   Brake booster failure caused a near miss. Wife driving with 5 year old daughter in the vehicle. The stopping force required on the brake pedal became excessive and the stopping (safe braking) distance significantly increased causing emotional distress. My understanding is this part (brake booster) has a defective diaphragm that deteriorates over time. The extended warranty created for this particular issue did not cover the vehicle at the time of the failure.

   NHTSA complaint #11435560 · source
6. Filed Oct 4, 2021CABrakes

   BRAKE BOOSTER INTERNAL FAILURE - This is a known issue and a safety hazard on Mazda CX 9 models and should be investigated again regardless of the age of the vehicle.

   NHTSA complaint #11435469 · source
7. Filed Aug 2, 202129,805 miVABrakes

   The contact owns a 2012 Mazda CX-9. The contact stated while driving 25 mph and approaching a stop sign, depressing the brake pedal the vehicle failed to stop. The contact stated that there was no warning light illuminated. The contact stated that she pumped the brake pedal and shifted to neutral until the vehicle came to a stop. The contact was able to drive to her residence. The contact took the vehicle to an independent mechanic and was informed that the power brake…

   NHTSA complaint #11427415 · source
8. Filed Apr 29, 2021110,000 miTXBrakesEngine

   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…

   NHTSA complaint #11414523 · source
9. Filed Nov 4, 2020129,000 miCTBrakes

   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, [phone removed]) and was informed that the vin was…

   NHTSA complaint #11372953 · source
10. Filed Oct 22, 202084,894 miGABrakes

    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…

    NHTSA complaint #11365802 · source
11. Filed Oct 22, 202054,000 miTXBrakes

    I was driving slowly about 30miph and began hearing a hissing noise when i depressed the brake pedal. Once i pulled into my driveway a small incline, and pushed the brake pedal it was very tight and stopped at a point, but would not go further, tried shifting different gears. Finally brake depressed. Hissing has continues, very stiff brake pedal

    NHTSA complaint #11365716 · source
12. Filed Sep 8, 202075,000 miOKBrakes

    Tl* the contact owns a 2012 mazda cx-9. The contact stated that while driving, and 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 [phone removed]) to be diagnosed. The contact was informed that brake master cylinder needed to be replaced. The vehicle was not repaired. The manufacturer was contacted and stated that…

    NHTSA complaint #11353788 · source

Source: U.S. National Highway Traffic Safety Administration (NHTSA) Office of Defects Investigation public data. Complaints are submitted by owners and are not verified by NHTSA or by us; a complaint does not prove a defect exists. View this vehicle on NHTSA.gov Methodology