With a good brake system, topping off the brake fluid should be an annual event at most. I usually checked fluid at every oil change back when I had an under-floor MC on some of the vehicles I drove in the 1960's, and it was very seldom I had to add any unless a wheel cylinder started leaking.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!