I have a 97 chevy cavalier. My abs light is on and the ets off light. When I hit the brakes, the pedal will kick back at me and it make a loud noise like plastic being chewed up. If I unplug the ets computer, it quits. I changed the computer and it did not work. It only happens once or twice a week. I went to GM dealership and they couldn't tell me anything. Has anyone had this problem and do they know how to fix it?