First, be polite
Second, write Nissan USA about your problem. Ask that it be fixed.
Third, if things are not happening, invoke your state's Lemon Law statute by trackable mail. This is just a formality but you really need to punch this step of the ticket.
Fourth, wait.
Fifth, wait more.
Sixth, make a "formal" recontact every month meaning you know they got the message. Faxing, if you have a Fax log, is just fine.
Step Three is the most important. You have to toll the bell, after that your interests are protected.
My experience. Bought my Armada in 4/04. Had breaks serviced five times. Made a good Nissan USA connect in January. Patiently waited as there really wasn't a fix yet.
Checked in (whined) last week. The "fix kit" that I unerstand is extensive is being shipped to my dealer with my name on it. A factory tech is coming 8/18 to do the install. We will see.
I think we have bought rock solid vehicles from a company that cares. Maybe not about us, but about their reputation. There is a brake problem that was caused by poor engineering or poor manufacturing. Nissan may have had no involvement in this process at all. I know we want it it fixed and I think they do too. We ain't driving the space shuttle so keep things in perspective. Give 'em a chance to fix it. If you want a fight have at it. You will probably win, get your attorney paid, and dump your truck back to Nissan. In the end you will have expended lots of energy fighting really smart people for something they really want to take care of in the first place. And, you've lost your truck. I love mine and want to keep it. That said, if they don't fix my brakes I am going to cut out their liver and eat it. Just kidding!