Funny, that's precisely what happened on my test drive. Since I do a lot of highway driving, I'm not about to buy a car that I can't test drive on the highway. During the test drive, he expected me to stay on relatively local streets, getting on a pretty fast 3/4 mile stretch of highway nearby, and then threw him by getting on route 95 south! I got out onto the highway and had it up to about 85 or so. As we were rapidly approaching the exit for his dealer, he said, "when you get a chance, try to get into loose gravel and slam the brakes. you'll be amazed." (I was, of course )Eric L. said:As for the brake shudder, I would guess its warped rotors from overly enthusiastic test drives, with the salesmen telling the customers to slam on the brakes to test the brake assist.