Chances are pretty good he doesn't have drum brakes on the rear of his Raptor.
OP you have a broken brake cable, there are 3 on this truck but chances are good your primary is broken. Look under the truck, right next to the back of the drivers side running board. You will see a black cable with some blue plastic doodads on it. Have someone depress the ebrake and watch for movement. If no movement the primary cable is broken. If it moves there then one of your secondary cables that splits off the primary is bad.