[thyristan]

Worn brake disks are a manufacturing problem. Nominally my VW needs new brake disks every 100Mm. Practically it needs new ones every 40Mm, because VW makes them from shitty steel that rusts and wears like hell, especially when there is salt on the roads in winter.

Some manufacturers use better steel and therefore have a longer disk lifetime.

[heisenbit]

It is not wear that causes break systems to fail but lack of use resulting in a fairly recently discovered threat to blank metal: Rust.

[thyristan]

I do drive to work almost every day, and I don't drive an electric car. So there is sufficient use.

And quite a few decades ago, people noticed that when you mix chromium, nickel, vanadium or things like that into your steel, it doesn't rust. Car manufacturers are just very slow in noticing.