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You will probably find it is a problem with the switch on the brake pedal. Get your self a cheap multi meter from an electronics store. Set it to meaure ohms. This is used to check if a connection is complete.
Take the wires off the switch on the brake pedal and test if the connection is open or closed. Push the pedal and check the connection again.
If the switch only had one wire then the negative connection is made to the body of the car. Put one probe of the volt against bare metal of the body somewhere and the other agains the terminal of the switch and test again.
This should tell you if the switch is broken. if the switch is good then you probably have a short circut somewhere between the brake lights and the switch. That is something has pinched or other wise broken the wire and it is touching metal of the car. You will have to follow the wires as best you can and look for damage.