I not do the runs from the master cylinder to the abs unit. I did however, change brake line from the abs unit to the front passenger wheel on a 2003. I used a brand-new oringal pre bent line(don't do that). I had to add some cuts, double flare fittings, and unions to get it in.
The fittings were for 3/16 line. Here's my adventure.
https://www.expeditionforum.com/threads/2003-brake-line-diagram.40965/. Yes I think the line from the master cylinder is slightly thicker.
The truck does not use the common double flare fitting. It uses an incompatible bubble fitting.
The flaring tool required is different. I bought a flaring tool with extra bits to make them double flares. I hadn't realized the difference yet by then. I found flare style unions easily and the unions /fittings were readily available. I'll probably get a bubble kit in the future.
Do you have a bubble flaring tool?
I found this helpful when I was learning about brake fittings. Ford left the double in favor of bubble flare some time ago
http://racetrackdriving.com/tech/brake-line-flares-metric-sae-inverted-bubble/
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