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If we say that yes, it makes them lower maintenance then that probably also means less prone to failure as if they don't need so much maintenance then chances are they are getting the little maintenance they do require where as a cable brake that requires more maintenance might not be getting it and therefor, is more likely to fail.
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See when you put it like that it's fairly obvious, but I didn't really manage to make the jump myself!
And it's daft that I don't apply the same level of scrutiny to cars, for example. I have never (or ever known of an acquaintance) experienced a sudden, catastrophic failure of brakes on a car. Small leaks that are caught by an MOT or service, sure. But that's the infrequent maintenance you mentioned.
Doesn't that just make them lower maintenance, as opposed to less prone to failure?
Genuinely interested though as I've never ridden hydros...