If it is the (BRAKE!) light the sensor in the master cylinder is sensing that the vehicle is low on brake fluid. Very seriously check the mastercylinder and be sure that the fluid is full. If the light is on, and the fluid appears full the sensor in the master cylinder may be stuck and giving the computer a false reading. If the fluid is low, fill with fluid and get the vehicle to a service center, when the fluid is gone so are your brakes so be careful.
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