hardly worth mentioning
Crashes / Fires:
0 / 0
Injuries / Deaths:
0 / 0
Average Mileage:
70,999 miles

About These NHTSA Complaints:

This data is from the NHTSA — the US gov't agency tasked with vehicle safety. Complaints are spread across multiple & redundant categories, & are not organized by problem.

So how do you find out what problems are occurring? For this NHTSA complaint data, the only way is to read through the comments below. Any duplicates or errors? It's not us.

2008 Mazda CX-9 brakes problems

brakes problem

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2008 Mazda CX-9 Owner Comments

problem #14

Aug 292016


  • 110,000 miles


Vehicle suddenly did not brake as expected. Brake pedal was hard to press and unresponsive. Brakes made noise while depressed. Vehicle was being driven at the time, and did not have the issue earlier in the day.

- Eau Claire, WI, USA

problem #13

Aug 012016


  • 95,000 miles
Brake hissing from pedal area and brakes are very hard to press. Difficult to stop vehicle without applying lots of pedal force until a certain point where booster starts working and vehicle stops quickly. Dangerous at first because vehicle doesn't seem to stop without a great deal of pedal force then suddenly stops quickly after more pedal travel. Also, engine runs rough when hissing sound is heard- probably due to loss of vacuum. Problem is at all speeds. It takes a great deal of distance to stop at higher speeds for emergency braking (very dangerous).

- South Bend, IN, USA

problem #12

Jun 062016


  • miles
I had to replace my tires because of the ball joints and causing my wheel to come off. My breaks sounds horrible even after I had them serviced if it rains really bad I get this cranking noise I have a weird sound to my vehicle right now coming from the front of the vehicle again and not sure what's the problem. I'm afraid to drive the vehicle to fast because I have children what's going on with this vehicle

- Coatesville, PA, USA

problem #11

Mar 232016


  • miles


The contact owns a 2008 Mazda Cx-9. while driving approximately 35 mph, the vehicle decelerated independently and the ABS and tcs warning lights illuminated. As a result, the tires failed to function correctly. The vehicle was towed to an independent mechanic where it was diagnosed that the brake booster needed to be replaced. The vehicle was repaired; however, minutes later, the failure persisted. The vehicle was towed to a dealer where it was diagnosed that the pedal switch needed to be replaced. The vehicle was repaired, but the failure persisted. The manufacturer was notified of the failure. The failure mileage was unknown.

- Miami, FL, USA

problem #10

Mar 102016


  • 76,000 miles
While driving and coming to a stop, the brake pedal went real hard and car would not stop appropriately. This happened multiple times, checked the brake fluid is full as well as changed brakes themselves..problem still there and progressively worse, un drivable because of compromised braking. There is only 75K miles on this automobile. Having the car towed to local dealer, where I was told that Mazda has extended the warranty for braking system, which would take care of this problem as well as reimbursement for towing and expenses. This defect is very dangerouse, there was no warning, no warning light illuminated on the dash, I am very fortunate that this was caught before an accident occurred.

- Harrisburg, NC, USA

problem #9

Jan 062016


  • 13,200 miles
Master cylinder leak causing the brake booster to go out as well. Suspension weak and rusty. Mazda refuses to address the problem.

- Fair Oaks, CA, USA

problem #8

May 012015


  • 109,100 miles


The brakes are hard to depress and the car is difficult to stop. If I start the car and depress on the brakes at a standstill, the pedal fells hard and goes down really far will I hear a "whistling" sound and also a "hissing" like if air is escaping.

- Comerio, PR, USA

problem #7

May 092015


  • 60,000 miles
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.

- Sparks, NV, USA

problem #6

Apr 202015


  • 140,000 miles
The contact owns a 2008 Mazda Cx-9. the contact stated that the brake pedal was difficult to depress. The contact had to shift the vehicle into park upon coming to a stop due to the failure. The contact also had to allow enough distance between other vehicles due to the brake pedal not completely stopping the vehicle. The vehicle was not diagnosed or repaired. The manufacturer was not notified of the failure. The approximate failure mileage was 140,000.

- Jacksonville, FL, USA

problem #5

Aug 042014

CX-9 6-cyl

  • 83,525 miles
I noticed that my brakes made a hissing sound at random times. Brakes would not work as usual. After "stomping" on brake, car continued to move for several feet.

- Cayey, PR, USA

problem #4

Jul 252013


  • 40,000 miles


The contact owns a 2008 Mazda CX9. The contact stated that while driving 25 mph, the brakes failed to stop the vehicle. The contact was able to safely pull over. The vehicle was taken to the dealer for diagnosis where it was stated that the brake booster needed to be replaced. The vehicle was not repaired and the manufacturer was notified. The approximate failure mileage was 40,000.

- Freemont, CA, USA

problem #3

Aug 302011

CX-9 6-cyl

  • 39,912 miles
2008 Mazda Cx-9 has a master cylinder machine problem. We replaced these items in August of 2011 and in less than 16000 miles we have the exact same failure. NHTSA action number PE11026. Mazda has identified a problem with a manufacturing process dor the master cylinder primary plunger that could result in inappropriate surface finish. We are in the process of replacing these exact same parts today! this is an ongoing safety problem and the Mazda dealer told me the vehicle was unsafe to drive and the brakes could fail at any time. Our brakes not only had a soft feel but the distance to stop was greatly increased. We have had to replace the master cylinder and vacuum power assist twice in sixteen thousand miles at a cost of approximately $1300.

- Van Wert, OH, USA

problem #2

Aug 272012


  • 190,000 miles
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.

- Copley , OH, USA

problem #1

Sep 202011

CX-9 6-cyl

  • 37,254 miles
Brought into the Mazda dealer schaumburg, il due to dashboard warning lights came on ; the tcf of light off light, the red brake light and the stability indicator. The dealer indicated that unaware of any problems related to this incident. Claimed their the brake fluid was low but no leak with the brake fluid. The dealer filled up the brake fluid. ( lights would randomly come on when breaking on hills or inclines) I was working in madison, wi. 8/20/12-8/24/12-same problem with vehicle- with warning lights. Although, now I had problems with the brake pedal and stopping the vehicle in traffic. I brought the CX9 to Mazda, elmhurst il. The dealer stated the car had the master cylinder and the power booster were leaking brake fluid and needed to be repaired. The failure miles was 54,400 miles. The repair is going to be $950 to repair. I believe that Mazda should pay for this repair since my vehicle is one of 37,000 vehicles with the problem that was not repaired. I don't understand why this isn't being checked during the service check ups and or being recalled by Mazda. This repair isn't a normal wear and tear repair and the repair should be covered by Mazda.

- Elk Grove Village , IL, USA

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