The brake cable's outer casing acts as a reference for the braking system.
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If there was no outer casing only a cable connected to the brake lever.
If you adjusted the brakes to operate properly with the handle bars straight, the braking would not work precisely the same when you turned the bars to either side.
Description: The brakes would work properly only when the handle bars were in precisely the right position straight ahead for this example. This next paragraph will become agonizingly redundant.