Knocking from front of the Maxima

I have a '96 Nissan Maxima that's making a knocking sound. It's coming from the front of the vehicle. The sound appears to be corresponding with the tire rotation.

It only makes the sound when I am in drive, not when I'm idling. If I press the brakes, the sound disappears.

My friends have suggested a problem with the front brakes. If so, what would be causing the brakes to produce that sound when they're not being pressed? Any ideas?

Thanks in advance.

May be your CV axel nuts are loose. I really don't know till i hear it or feel it.