I've heard several reasons for the wire wrap. One is absorption of vibrations to avoid fatigue, one is to armor the line against abrasion and rock damage, one is to avoid kinking when the line is original, and the last one is to dissipate heat from the fluid by providing more radiating area. Take your pick.
THe coils in brake hard line are to spread the bending force over a wider area and avoid line fatigue, and to provide some room for line movement when you have body/chassis flex, since the MC is on the body and most of the other components are frame mounted, like the rest of the hard lines, proportioning valves, etc...
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