I have noticed the same thing on my Nismo...at first I thought it was suspension because it would make a noise each time I went over a speed bump here in my complex. Then I realized it was the brakes making that noise right as I let my foot off the brake pedal to ease over the speed bump... It goes away after the pads heat up but it still bothers me as this is a new car
I will just mention this to dealership when I take her in for 1st oil change..Meh!