CarComplaints.com Notes: The only area of real concern for 2012 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 for most CX-9 owners, 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.
Sunroof leaked like a sieve when going through (any) type of car wash. Dealer replaced seal under warranty. Fixed the problem but I can tell that it's only a matter of time before the new seal wears out as well. Can already hear a whooshing noise from the sunroof as the car is dried in the wash. Sooner or later water will (once again) come raining down.
A D V E R T I S E M E N T S
Sunroof leaked like a sieve when going through (any) type of car wash. Dealer replaced seal under warranty. Fixed the problem but I can tell that it's only a matter of time before the new seal wears out as well. Can already hear a whooshing noise from the sunroof as the car is dried in the wash. Sooner or later water will (once again) come raining down.
- Christopher M., Lansdale, PA, US