OK... couple things...
first, the brake fluid.. not only does it absorb moisture, which can lead to boiling and therefor pedal fade under high heat loads, it also leaches copper out of the seamless steel tubing used for brake lines. Steel tuning is made from a foil that's rolled, like tinfoil on a roll in the wife's kitchen drawer.. only difference is, they copper braze it as they roll it up.
The copper, coupled with the moisture is absorbs (what's called hygroscopic contamination) and the dis-similar metals in the ABS unit (steel, aluminum, copper) sets up electrolytic corrosion of valves in the ABS unit, damaging it.
IIRC, Ford suggests replacing the fluid every two years.. most of the industry says replace at 400ppm copper. You can get dipstrips to test at any parts store.
Secondly, brake rotors..
Don't scrimp. That cheap China garbage from Advance, Auto Zone, and even O'Reilly's and NAPA will pit, bloom and shale apart within a year.
Personally, I prefer (NOT intended as a recommendation) use the NAPA ONYX rotors. The polymer coating limits moisture penetration of the iron.
But, you can do whatever you want, it's your truck and your wallet.
