I would also say filing the end flat when using compressionless outer is a waste of time; as soon as you put a bend/radius in the cable the end will no longer be flat.
You bend the cable before cutting (sorry, I should have mentioned that).
If it's not flat, the tension will deform the end leading to a sudden decrease in braking power.
Usually when you yank on the lever hard, as you're about to go into the back of a bus.
Sorry is this for helical or braided, I thought you put a bend in helical housing where cutting to get a better, smoother cut. Or maybe I've been doing it wrong for decades.
You bend the cable before cutting (sorry, I should have mentioned that).
If it's not flat, the tension will deform the end leading to a sudden decrease in braking power.
Usually when you yank on the lever hard, as you're about to go into the back of a bus.