Adjusting the Parking brake is a can-do
(1)Chock the front wheels(forward and aft) raise the rear tires off the road surface,place rear axle on jack stands.
(2)Remove the Tire/wheels(can be done with on but easier off)
(3)Remove the brake adjusting hole cover from the backing plate.
(4)Turn the brake adjuster screw to expand the parking brake shoe and linings until they drag against the rotor.
(5)Back off the brake adjuster screw until no drag is evident