I am installing SS brake lines (front) and I can’t get the old line off. The 10 mm wrench striped the bolt. I soaked it with WD-40 overnight and used wise-grip which chewed the bolt completely. Any suggestion?

 

Get a small pipe wrench w/good teeth for grip. Pop out the clip and pull out the hose from the mounting (dismantle a little more) to enable the pipe wrench to get a good bit. Maybe even cut the existing brake line to remove caliper to a work bench with a vise