Truck feels light as a feather on acceleration now, thing must have been really dragging. Anyway online I found a good test to share if you have dragging brake concerns. Hit the brakes a few times then loosen the bleeder valve on the caliper, if it flies out the line is collapsed. If it drips your caliper is seized. I replaced the caliper months ago with no change, the hydraulic hose ended up being the culprit. Thread issues seem widespread on the Motorcraft hoses and quality control isn’t great, so be ready to tap the threads.
