Keith_J
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Brake lines run in the thousands of PSI. An air compressor is only 150 PSI. Besides, any leaks will show up as a really spongy pedal feel.I wonder if we could put a fitting or something on it to apply regulated pressure to the system with your air compressor. that way we could visually inspect the lines to see if there's any slow leaks while it's all exposed like this.
The real issue to replacing the lines is getting all the fittings and clamps loose without distorting the old lines. Having an accurate pattern for bending new lines is a real help. New spring armor might be an issue, it isn't needed since the truck won't see intentional off-road action. Forget the old armor, rust spawns new rust.
I'm not worried about the old fuel/vent lines. If these fail, the engine won't run since they are negative pressure lines, the pump is at the engine and powered by the engine. It isn't like a new vehicle with 50+ PSI from the in-tank pump.