Brake light

What is your question?

My brake light came on about 3 days ago, it has not gone off but it does go off when I turn car off and then it will come back on ? The low traction comes on sometimes when I drive slow not all the time I just would like to know if I need brake fluid or what even though I have not checked it out yet. I'am just soooooooooooo scared about the brake light. Please do let me know Thank you very much.