Have a close up look at the brake pedal, should be easy spot a switch with wires going to it, something evident may jump out, like worn, loose, broken etc, it may be adjustable.
Apply the brakes by hand & see how it acts on the switch & if the brakes come on. There could be a prob internal to the switch so find a way to connect, or join the wires, to see if the brake lights come on that way.
That's 1 way that may determine whether a brake switch issue, wiring or something else.
Usually, a quick look is all it takes to figure out changing it out & prob some utube vids out there on either the easier or trickier ones.
Apply the brakes by hand & see how it acts on the switch & if the brakes come on. There could be a prob internal to the switch so find a way to connect, or join the wires, to see if the brake lights come on that way.
That's 1 way that may determine whether a brake switch issue, wiring or something else.
Usually, a quick look is all it takes to figure out changing it out & prob some utube vids out there on either the easier or trickier ones.