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Hello, my name is ***** ***** I am a professional here at Just Answer. I have noticed that your question was not getting a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.The break Waring switch is part of the proportioning valve and the light is likely staying on because you either have trapped air in the valve or the valve is bad. Before you consider replacing the valve try cracking the lines at the vale and see if you can bleed any air out of it just like you have at the master cylinder. It may take a few tries but in most cases if you can get the air out the light will go off.