Obsolete. With disk brakes, check valves are a thing of the past.
The master cylinder brake fluid level shouldn't be topped of as brake pads wear.
The engineeres designed the reservoir to drop to the low fluid mark, and set the BRAKE warning light, when the pads are worn down to the point of replacing, if no leaks.
If you keep topping off the fluid, you could wear the pads down to rotor ruining metal on metal.
Of course that all goes out the window in lightly used MHs since Ford recommends frushing and replacing the fluid every 2 years on class A motor home chassis.
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