yeah.. well picture this ..
Somewhere way down in the cable's sheath the old twisted, rusted wires have mostly broken.. there are only 2 or 3 of the thin strands still intact.
You're flying down a steep hill.. a big old truck slowly pulls out of a driveway about 100 feet in front of you..
And then you wake up! It was just a bad dream. The brake cable is fine. :)