One brake cable and a length of outer. The rear brake was getting very difficult to apply last ride. At one point I thought the lever had seized.
Removed the whole lot and saw evidence of rust in the outer, new stuff bought and fitted. Smooth as a smooth thing with added smoothness.
Bike is less than a year old, perhaps assembled with no lube. I wiped the new cable through some synthetic grease on my fingers when putting it all back together, seems a logical thing to do.
Oh yes bought some new brake pads too.