My break lights in rear are all fully functional, even with the "Break lamp" on and off. All bulbs are good and the "Break lamp" light will turn on after about 10 mins of driving. I turn my car off and back on; "Break lamp" goes away... After another 10 mins, it turns back on. Sorry if that...
You should check if it has a Crack in the filet of edge where the 90 degree angle is.... I'm other words where the rotar meets the hub part, to check if it isn't cracked. Same thing happen to me and I have a cracked rotar at the moment.
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