Two problems related to brake disc rotor have been reported for the 2005 Infiniti G35. The most recently reported issues are listed below.
Leased vehicle, highway driving and very limited local/city driving. Brakes had 'grinding' noise whenever initially applied and I was told by dealer that was how the "european brake system" sounds -? required front brake pads/rotors replaced at ~ 19,000 miles 8 months after acquiring the car. Rear brake pads/rotors then had to be replaced 13 months after acquiring the car at ~ 29,000 miles. Was told when had car in for faulty air bag light ~ 6 weeks ago front pads were worn to 4. 5 mm. Car is in for 38k service now and it is suspected I am going to have to replace the front brake pads, again after only 19,000 miles since new pads were put on!.
The brakes on my wife's 2005 G35 Infiniti are dangerous. My wife has had two front brake repairs in the year (and less than 15,000 miles) she has owned the car. When she brought it in this time, they told her the rotor was on the brink of failure. In my opinion, after less than 8000 miles since the last brake job, the brakes should not be on the brink of catastrophic failure. Their response is that is normal brake wear for that car.