These are the steel lines in the engine compartment , before the tab where the rubber lines connect. I wondered if it wasn't something as common as the factory having excess line when they installed them and just coiled them. The disc brakes have a proportioning valve, so I'm not sure that I would need the lines coiled.
If the lines were short and straight, the motion of the car would eventually crack the brake lines; the continual flexing would fatigue the metal and eventually break it, just the way a spoon bent back and forth repeatedly will eventually break. By forming the brake line into a coil, the flexing in any one section is very small, and so puts almost no strain on the line.
