Nissan Kicks Brakes?

Talk to the service manager and describe the problem but don't tell him its from that dealership.  The used car managers rarely talk to the service manager about their inventory.

Might want to move this to repairs for better answers.

Sounds like it might be a warranty item if its not normal with that car. Which should mean it won't cost you anything to repair.

You're going to have your mechanic do a pre-purchase inspection right?  Ask your mechanic.

That's rubbish. 'The sound should go away'?? Tell them if they fix the brakes you will consider buying the car.  I expect lubrication is all that's needed but they are too idle or arrogant to cure it. Walk away if necessary as there will be many similar examples of Nissan out there.

Were those the words of a technician, or a salesman? I sold cars and proudly proclaim, "I sucked at it". I could not do what was expected of me to be successful. Very few technicians sell cars, but anyone can be taught to chase a buck.