If you only have rear air like me, I would just replace the entire line if damaged. If a front line there is a special tool that puts a new end on a pressure line like brake line called double bubble or something you can splice in a new section it's very high pressure so you can't use rubber hose and hose clamp. Use a torque wrench when you can don't over tighten anything


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2011 E70 • N55 (me)
2012 E70 • N63 (wife)