function of brake switch at proportioal valve ?

[ACII]

Hy all

in the past i had installed a separate brakes switch ....so at the moment i am redoing the brake pedal / brake booster setup.

This time i would like to use the brake switch which is mounted directly at the proportional valve...

As u can see on the pic ...the brake switch does have a small nippel on the bottom side..
On the other side it has 2 pins for a plug (or wire)

So if i press the nippel ..i thought i will get a connection (or disconnection) of the 2 pins on the top of the switch...
But "no"... the 2 pins are always connected....i just get a connection of the pins and the nippel itself...

So i am really confused right now....how can i handle the brake light with this kind of switch

Thanks for ur help