My brother test drove a ford with such badly warped, rusted front rotors that he thought it blew a tire when he hit the brakes, and the entire gauge cluster went dead when he hit the first bump. He brought it right back and went to a different dealership.
He doesn't have the best car sense though, ended up paying 8k for a 97 civic with 27k miles on it. I told him he could buy a thousand dollar jeep, I'd help him dump another grand into it to make it reliable, and he'd have enough left over for a few years worth of fuel but for some reason he didn't like my math.