ABS and ETC lights on

[mlbenz00]

my girl friend was driving the benz today it is a 2000 ml 320 and she said while she was driving suddenly the lights came on it was the etc , abs and maybe some thing else too, and the car strted to make a loud noise , shwe pulled over turned the car off and on couple of times and everything was fine. i wondering if anyone had the same problem and knows how to fix it. thanks