Hi I have run all of my cabs on a preemptive maintenance schedule and covered over 900,000 miles and never had to change a rubber brake hose on the fronts, or a metal brake pipe for that matter Fords used alloy brake pipes and there lies the problem [bi metal corrosion] in fact the last car went to its new owner with over 270k on the clock, the thing that causes most problems with any brake pipe is lack of timely fluid changes as its the water in the fluid that is the catalyst for premature corrosion, apart from which to get the correct length and shape for a copper replacement you will have to present the original as a pattern and pray the people who do it have the correct kit to follow that pattern bending and angle tools, it is nowhere as simple as it looks and if you manage to kink the copper pipe its game over.
Steve.