I normally work on my own cars, 2 weeks ago due to time restraints I took the CX9 into Mazda to change the transmission fluid. I did one at 55, 85 and now the odometer is at 115,000. surprising it cost $125.00 (I had paid $65 a qt when I did it myself). Today I lost the power brakes and a quick check at the brake level show none and I found the cap was just sitting on top of the reservoir. I called Mazda back because they did a 20 point check which included fluid checks. They told me to bring it in. It has been diagnosed as a bad booster and master cylinder. I have never changed out a booster, retails between $85.00 and $165.00. Any words of wisdom from anyone out there to watch out for? I did see the back reservoir line is a little b**** to thread up, Mazda has quoted me 6 hours and $1650 bucks for the repair.