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I would highly recommend cleaning the slide pins. Having just replaced a caliper mounting bracket on my SD because of a siezed pin, I would make a point of checking it out. Pull them out, clean them up, make sure you put a good grease on them and reinstall.
How many miles on your rig? That would help to know what else to look at.
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.