I didn't replace brake lines...my trailers only a few years old.
Generally, when it comes to snaking lines, if the old line is still in, bind the end of the old to the new ( duct tape can create a nice smooth mate ) and pull the old till the new shows at the other end.
If not, maybe check with the mfg for the schematic and match up.
Best of luck .....bleed the lines clear and test.
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