One problem related to brake grinding noise has been reported for the 2004 Infiniti G35. The most recently reported issues are listed below.
We have had on going brake problems with this vehicle. It started immediately. Grinding noise in rear brakes. We had to replace after just one month. Since then we have replaced the front brakes and rotors twice and rear brakes one other time. This is ridiculous when you consider this car is only barely three years old and has just 29,000 miles on it.