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Also if the truck sat for a long time, it could have some corrosion and dirt on the caliper pistons causing them to hang up a bit. There is a rubber seal on outside, not the real hydraulic seal on the inside. Disc brakes only have the rubber seal to pull the piston back, no springs. Flex lines can break down and have trouble releasing. You might consider just getting rebuilt calipers and new flex lines, fix it all with new parts.
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.
