I replaced the rear brakes on my 01 maxima. After I was finish I took it for a ride and I notice a grinding noise coming from the back. I only hear the noise at 10-15mph. When I brake I don't hear the grinding noise only when my foot is off the brake. I took it apart and everything looks ok jus don't understand why im getting that grinding noise

 

Dust shield

 

I checked the dust shield that isn't it, but the noise sounds like its the brake rubbing on the rotor

 

Well, the pad will sometimes make a little contact. However, I think your issue may be a seized caliper. If it was very hard to press it in, and you're getting a lot of rubbing, you'll need a new caliper. Good news is they are not that expensive.