the brake line material might not like the heat and would corrode over time.I'm with the guys, copper is easy. i'm having a whale of a time finding a 3/16 reducing bushing to 1/8 to install new oil lines to the filter at that same location. The block on the other side for the other line is 1/8 pipe and so are both sides on the filter.

Larry
Old man᠁Old truck᠁neither one goes very fast. All you need in life is TIME, PATIENCE and MONEY.
If you are missing one component, you'll need an abundance of the others two.