2011 G37X Coupe, 67000 miles. Front rotors and pads replaced 1000 miles ago. When reversing out of parking spot brakes produce a loud squeaking noise. After car is warmed up and driven a few miles squealing does not occur when reversing out of subsequent parking spots.

 

If you have an xS, the four-piston calipers do this for most of us. If you have the smaller brakes, try cleaning and greasing the slide pins.