2018 Mazda CX-9 service brakes problems
This is a safety-related system. If you notice symptoms, stop driving and have it inspected.
What owners report
“My 2018 Mazda CX-9 experienced catastrophic engine damage after a radiator failure allowed coolant to enter the engine. The vehicle provided no dashboard warning, overheating alert, or coolant warning before the failure occurred. Modern vehicles are designed to alert drivers to overheating or cooling system failures. The lack of warning prevented me from addressing the issue and resulted in catastrophic engine damage. I believe this represents a potential safety defect in the vehicle’s cooling s…”
NHTSA complaint · filed 03/12/2026
“my 2018 MAZDA CX-9 safety issue SCBS / SBS, LAS / LDWS, MASTER AND/OR HBC WARNING LIGHTS Forward sensing camera (FSC) stops functioning cause my car run rough even depress accelration and those light came on dashbaord -Forworad smart city brake support malfunction -smart brake system -front camera sensor malfunction”
NHTSA complaint · filed 09/09/2025
“I am submitting this recall request because my vehicle has experienced repeated incidents of a serious safety issue. While driving—most often on the highway—a warning appears that says “Smart System Brake Malfunction.” Immediately after, the car begins braking on its own without driver input. This has happened multiple times and, based on online reports, it appears to be affecting many Mazda vehicles across different models and years. Each time, I have been forced to pull over, turn off the car…”
NHTSA complaint · filed 08/22/2025
“1. The navigation has a frosted crackle appearance framing the screen. It is difficult to read the navigation when needed. I know this has happened to other models of this vehicle and those were recalled and covered. 2. The brake senor keeps going off stating "SMART BRAKE SYSTEM MALFUNCTION". This goes off repeatedly while driving. 3. Then a second message pops up and reads "FRONT RADAR SENSOR SYSTEM MALFUNTION".”
NHTSA complaint · filed 04/15/2025
“Within 6-8 months of purchasing the car we noticed the brakes squeaking and vibrating. At that time the car was under 25,000 miles. At our maintenance check it was advised that we have the brakes resurfaced at the next appt. Back brakes were done in 3/2019 and the front were done in 6/2019. We noticed the squealing and vibration returned again. At our recent maintenance check, we asked to have the brakes and rotors inspected. We were told everything looked fine and nothing needed to be done, how…”
NHTSA complaint · filed 05/22/2021
“HAPPENED TO ME TWO TIMES IN PAST THREE WEEKS, WHERE I AM COMING TO A STOP, OR HARDLY MOVING, AND CAR SUDDENLY ACCELERATES. HAD MY FOOT ON THE BRAKE AND THE CAR WAS STILL TRYING TO ACCELERATE. YESTERDAY, 4/24/21 IT TOOK ALL MY STRENGTH ON THE BRAKE TO KEEP THE CAR FROM PULLING INTO ONCOMING TRAFFIC. I HAVE BEEN DRIVING FOR 39 YEARS AND HAVE OWNED MANY CARS, AND SOMETHING LIKE THIS NEVER HAPPENED TO ME. I WILL BE BRING THE CAR DEALERSHIP TOMORROW, THE CAR HAS ONLY 10K MILES ON IT AS WE DON'T D…”
NHTSA complaint · filed 04/25/2021
“EMERGENCY PARKING BRAKE ('EPB') BEGAN TO MALFUNCTION FOLLOWING RECALL TO FIX ELECTRICAL COMPONENTS ON MAZDA CX-9, 2018. EPB WILL NOT RELEASE, OR WILL UNEXPECTEDLY AND SUDDENLY RELEASE WITH CAR ACCELERATING IN GEAR ('DRIVE' OR 'REVERSE'). MOST RECENTLY WHEN ACTIVATING THE EMERGENCY PARKING BRAKE ((CAR WAS ON A A ROADWAY INCLINE) THE BRAKE WOULD NOT RELEASE, AFTER 2 HOURS OF BEING STRANDED AND OF ATTEMPTING TO GET THE BRAKE TO RELEASE, ( INCLUDING ROCKING/SHIFTING/ALTERNATING GEARS/BRAKING/SEAT BE…”
NHTSA complaint · filed 03/19/2021 · crash
“I'M CONSTANTLY HAVE A FRONT WINDSHIELD ERROR : CAUSING MY VEHICLE TO JUST AUTOMATICALLY STOPING WHILE DRIVING ON THE FREEWAY AND STREETS. MY AIR BAGS DIDN'T DEPLOY WHEN I WAS I A ACCIDENT . I'VE TAKEN IT TO THE DEALER 3 TIMES ALREADY AND THEY ALWAYS HAVE A DIFFERENT EXCUSE OR REASON”
NHTSA complaint · filed 07/20/2020 · crash
Unverified owner reports from NHTSA's public complaint database.
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- How common are 2018 Mazda CX-9 service brakes problems?
- 11 owners reported service brakes issues to NHTSA for the 2018 Mazda CX-9, 2 involving a crash. Counts scale with how many were sold.
- Is there a recall for 2018 Mazda CX-9 service brakes problems?
- No matching recall is on file. Check your VIN at nhtsa.gov/recalls for the latest.