Just like engine oil and other critical fluids, brake fluid is formulated with additives that inhibit corrosion, but
those additives break down over time.
Not exact matches
As mentioned in the answers in the linked question, the various
additives in the oil
break down over time, so the limit isn't just the number of miles done.
Oil
additive packages
break down over time, so I will not go any longer than my car maker says on oil changes, but I am sure I could.