Brake Line Plumbing with 4-Link (calling Broncomania!)

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Just want to make sure I am planning this correct before I go buy my lines. The line to the rear needs to run down one of the upper arms. That means there needs to be a soft connector line at each end of upper arm that is used for routing, right? How did you make your soft connector line, or did you find an off the shelf brake line that worked? Did you connect back to hard lines at each end or continue with soft lines? Any tips or tricks?

Thanks
Robert