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Ford makes a good Heavy Duty DOT3. I flushed mine with Performance Friction Z-rated because I had it sitting around. The boiling points are only about 20 degrees different, but either would be a great choice.
Get a good DOT 3 rated fluid and flush your system with new fluid once a year, and you'll be fine.
Over time, brake fluid gets contaminated by water because brake fluid is hydroscopic, which means it absorbs water at every opportunity, so it must be changed regularly, just like your oil.
Since water degrades brake fluid by lowering the dry boiling point, it must be maintained like all your other fluids, unfortunately brake fluid is almost universally overlooked.
Rezvani's Latest Post-Apocalytic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.