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Yes, that's the parking brake. You should be able to re attach it. You may need to adjust it or try to figure out why someone decided to disconnect it. Possibly because it's not long enough if the truck is lifted.There are no stupid questions...here's the test.
(see pic):
What is this cable on the driver's side that runs the length of the truck...except for where it seems to have pulled apart? Parking brake?View attachment 221602