Exactly what Crash said. I had BMW replace an X5 of mine with brake issues. I literally drove the car to the dealership and left it in the service bay. I said the car was unsafe and I wouldn't drive it. The service manager worked it out with BMW NA.

Your dealership should be working hard with you. The service manager has more pull than sales.

In my case BMW wanted no part of the lemon law or fighting. I thought they handled my situation was well as they could considering how screwed up the X5 was. I was still pissed, but no where near as much as I could have been.