Hello,
Brake fluid level switch, I took mine apart and it’s so easy to do! 5 mins top.
This was a potential IVA fail so I had a closer look at it.
Remove from car,
Take rubber seal and thread cap off,
Prise off the translucent cap/disc at the very top of the switch ( I used a blunt chisel )
Now you can see the switch comprising of a brass disc and two contacts, clean the contacts,
Reassemble and test.
Works like a dream!