Hello everyone, I hope this is not the wrong place to ask. I’ve just changed my bike’s brakes (caliper type mechanism) because one of the two cable jackets did this (the black part correctly stops at the brake lever but the central part is smaller and is able to enter the brake lever). After changing to a new one at the front, I tensioned the back one and it broke the same way after a few tests. Am I doing everything wrong? (The bike is really old and rusty but seems to me I can only upload 1 pic per post)
Edit: link to some more photos
No, this is basically the point that anchors your brake force. It's what you "push against" when you pull the brake. No (pre) tension can make that happen. It means something failed quite hard, I've also never seen this. Even if you put all your might into the brake lever, that shouldn't even be possible.
Maybe the slot this is seated in was worn quite badly, but that's still a spectacular result even for that.