Its Dot 4 LV (Light Viscosity) in the Kugas.
The brakes are quite complex, ABS and stability control etc.
As for changing the brake fluid, mine was tested at the Ford dealership during a 'health check' at 22 months old and was ok.
I will be flushing and changing mine when I change the brake pads in about 3 months. Damp all the time in Lancashire England!
A two man job can be done in a hour easy. Will report when I do it.
As for the Thread starter: Happyarry: Don't leave it in for 21 years - as per picture attached.
I resurrected a Mk4 Fiesta 1997, been garaged, PASSED the Mot, and it was weeks after we did the fluid.
Top layer - new fluid, the band was rust, water and other foreign stuff, bottom layer old fluid.