Car is a 2013 G37x sedan, I've noticed lately that whenever I apply my brakes lightly/moderately when stopping from about 10mph or less, there is a high pitched squealing sound. It seems to only happen when applying a very specific amount of pressure to the pedal. If I were to "slam" on the brakes it would not make the noise. The rear rotors were replaced about 10k miles ago and the front rotors were resurfaced at the same time, but the pads were not replaced because there was plenty of pad left, still is now. Any input or suggestions? The brakes are all OEM, no vibration or anything when stopping. Thanks ahead of time.

 

Take pads out clean back plate put copper grease on back of pads and lube guide pins