A Powerstroke is heavy before the trailer gets hooked up. Add bigger tires, a trailer, steep grades, heat, and daily use, and the brake system starts working a lot harder than most people give it cred

When building or modifying a 6.0L Powerstroke diesel (2004.5–2006 Ford Super Duty), reliability upgrades often focus on major systems like head gaskets, the oil cooler, and EGR components. However, on