fuses?

disconnect the brake switch wires and link together, replace the fuse.
(note brake lights will be permanently on with wires bridged )if fuse remains INTACT .replace the brake switch , if the fuse blows wiring loom will need to be checked as some where the supply has developed a fault wire chaffed where it go's through a hole in the wing,
check also,
around the brake pedal area that pedal has not rubbed through the wire due to the way the wire has been fitted

wirecutterman
June 2009