Go and take it out for a spin at a canyon.

 

+1 on the noise in reverse. A google search appears to indicate this is a common issue plaguing alot of nissan/infinitis..

 

how do you clean off the brake dust?

 

i also only squeek only when reversing, took it to the dealership many times, they said its normal

 

were u going fast and all of a sudden u had to break extremely hard?
thats all i could think of

 

I don't think that would be the cause for it to just happen in reverse. If that was the cause, it would happen probably under normal braking conditions.

 

my brakes haven't really been making noise but i can feel quite a bit of "chatter" or vibrating when I use the brakes. The best way I can discribe it is when I had my Accord it would do the same thing sometimes when you break over bumps i think it was the abs and or Vehicle Stability Assist kicking in. I just picked my car up on last thursday. Is this part of the normal break in period for the brakes?