Problem is - here in the US - the brake lines you purchase at the auto parts store are the wrong thread, and have the wrong flare. Sure I have a Flaring tool - but the typical non powered flaring tools don't work with steel brake lines that Volvo uses.Pretty much any garage should be able to fabricate new brake pipes for you.
I would source a new one at a Volvo dealer (if they still sell them for that car xx years later)