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
You're not doing it wrong, cables corrode/wear out. If the bike is that old and rusty, replacing the cables is normal, as is the tires/tubes, the brake pads, spokes (they might snap if you're truing up the wheels), chain links (if any are corroded), basically all of the wearable non-frame stuff. If there is rust on the frame, it might be structurally compromised and unsafe to ride.
thanks, will look at the chain and frame too! (Doesn't seem to be that much rusty)