Assuming this is a Ford F53:
Wipe the top of the reservoir clean before removing the caps. Mine had a lot of dust and crap on top of them. Use DOT 3
When I bleed my brakes, I poured the fluid into a small cup, then poured this into the reservoir. To see the level, I'd put my trouble light on top so it would shine down inside the reservoir, The reservoir is translucent enough so I could then see the level.
F53 Replacing Brake Hoses – 1999 Southwind 35S