They're "curled" or looped to prevent vibration traveling along the line
causing a fracture where it connects to the MC.
I guess the correct term is "dampening" loop.
>I have a rookie question for you guys, I am installing power brakes on my '47
>and am wondering why the boys in Detroit curl the brake lines where they come
>off of the master cylinder is there a reason for this? The donor car that I
>took the master cylinder and the proportioning valve off of was set up like
"Nothin lasts forever except old Fords and a natural stone" - Willie Nelson
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