Originally Posted by
Polaris OBark
DOT fluid is much more hygroscopic [sic] than is mineral oil, so if you had that, I would definitely have said flush it once a year.
It won't hurt to bleed mineral oil brakes yearly, but there isn't the same imperative as there is for DOT fluid.
Full disclosure: CXWrench is a pro mechanic. I am not anywhere close.
That doesn't excuse being obnoxious but does explain being ridiculously judgemental. Millions of hydraulic braking systems are not being flushed once a year or even once a decade, working just fine. That was a massive overreaction to a simple and innocent question. Other than creating work, I can't see any reason to flush a bike's hydraulic brakes yearly or even every other year.