Dieseldiehard were you aware the hydraulic suspension lines carry over 1800 PSI?

You need good lines to hold that much pressure. Brazing in a new section of pipe might work but it would be easier to replace the pipe. The only rubber hose that would hold the pressure would be hydraulic hose. Much more costly than a steel line but might be the way to go if it is impossible to worm the new steel line into position.