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Hello! All the brake lights are controlled in part by the Stop Lamp Relay (#49)...When you tap your brakes all the brake lights come on ...Then off...For only the top mounted light to come on when you do not tap your brakes would require a wire (Light Blue in color) to be touching battery in the harness...question is; When you see the top light come on are you certain the other brake lights are off?...Have you had someone monitor the lights when the problem happens? If only the top mounted light is malfunctioning the problem isn't a component, as such, but a wiring fault (which I can find)...If you as the driver only see the top light come on and assume the other brake lights are off It is more then likely the relay mentioned earlier or a defective Brake Pedal Position sensor...
Tell me if you are certain only the top mounted brake light comes on by itself...And I'll take it from there....Guru...Saailer
Well i can explain this and hopefully it helps solve some ideas, my brothers saturn has a system that works like a traction control and it applies the brake to either front wheel when the oposite wheel is spinning or slipping. so there is a sensor that detects the wheels loss of traction and it sends a message to computer that tells the other brake to apply. so if you can find out what controls this applying of brakes i bet you will fix this problem and i'm very sorry i cant help any more than this. but ask alot of questions and go to some shops and ask questions, this is also how you meet new people with experience for future problems.
Check for a a sticking brake stoplight switch. This switch is usually located just above the brake pedal under the dash.
(Alternatively, if a relay is fitted to control the stoplights it may be sticking on)