Working on two bikes now. 1996 Magnum 425 and 2000 Xpedition 425. Both have the brake line from the master cylinder to the brake distribution block completely blocked with corrosion. At their age neither of these are high value bikes so I would like to repair at minimal cost. The Factory parts are $90. I don't want to compromise the integrity of the brake system but would like to avoid spending $180 on this fix. Any suggestions?