What is the brake light problem if the pedal switch isn't bad?

Answer 1

Some vehicles are equipped with a low brake fluid level light that is nothing more then an electric float device mounted in the master cylinder brake fluid resevoir, when the brake fluid drops to a certain level the float drops also setting off an electric sensor warning light telling the driver of the vehicle a possible problem may be taking place in the braking system of the vehicle.

Check the condition of all four brakes look for any brake fluid leaks at the wheel cylinders, brake lines, master cylinder etc. if all is ok fill the master cylinder to its proper fill line and the light should go out.

NEW ANSWER: I believe the question was a brake light problem.

If you are SURE the brake light switch on the pedal is good then you need to check all the GROUNDS in the brake light wiring harness and the grounds in the rear brake light sockets. If those things check out okay, Then your brake light problem is most likely the multifunction switch in the steering column.

It would have been NICE to have known what YEAR and type that you are working on.