One problem related to brake disc pads has been reported for the 2004 Infiniti G35. The most recently reported issues are listed below.
My 2004 G35x sedan has 28k miles on it and I'm on my 3rd set of brakes. (90% of my driving is highway with little braking). The dealer advised me infinity knows about the problem and extended the warranty to 36k miles and that's all they would do. After just 100 miles of driving with new pads the wheels are blackened with brake dust. My last set of front pads lasted only 10k miles.