When I needed new rotors and pads on my F150, I just pushed the caliper pistons back in like I've done for 35 years, and cleaned and lubed the other components. Set off to go on a hunting trip and seized a caliper within 15 miles from home. Freed it up with a pry bar, stopped at NAPA, got two rebuilt calipers and a jug of brake fluid, and 3 hours later was on the road again. The pistons get weathered by the salt, sand, and water and don't slide as well as they did when new.
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