CarComplaints.com Notes: The only area of real concern for 2010 Mazda CX-9 owners is the brake booster.
In 2014, Mazda extended the warranty on the 2007-2013 CX-9 brake booster to 7 years / 90,000 miles. However this extended warranty has expired, so buyer beware.
This Mazda CX-9 brake booster failure isn't terrible in terms of repair cost — it "only" costs $550 average to fix. However it is a safety issue when the brake booster fails as it increases stopping distance. Owners have reported having to stomp on the brake pedal, & crashes/injuries have been reported due to this CX-9 brake booster defect.
The Extended Warranty company "National Auto Protection Corp" is asking for what's called a teardown that cost over $900 so that they can have their inspectors verify what cause the car to overheat. They are saying that this looks like water has been going into the engine for a long time even though I explained to their ignoramus selves that I watched my mechanic pour water into the radiator and when the vehicle kept taking water without filling up, he opened the cap where you fill up the oil and saw that all the water had went into the engine and he stated that it's going to need a new engine. I had it towed to Mazda of North Miami and they confirmed that the water pump had broke, causing the water to be diverted to the engine. I had just had the oil change a few days before that and checked it that morning and it was clear and normal.
A D V E R T I S E M E N T S
The Extended Warranty company "National Auto Protection Corp" is asking for what's called a teardown that cost over $900 so that they can have their inspectors verify what cause the car to overheat. They are saying that this looks like water has been going into the engine for a long time even though I explained to their ignoramus selves that I watched my mechanic pour water into the radiator and when the vehicle kept taking water without filling up, he opened the cap where you fill up the oil and saw that all the water had went into the engine and he stated that it's going to need a new engine. I had it towed to Mazda of North Miami and they confirmed that the water pump had broke, causing the water to be diverted to the engine. I had just had the oil change a few days before that and checked it that morning and it was clear and normal.
- Jimmy S., North Miami, US