disc/drum diagnosis help needed

yes I thought that was strange that the one pad was real thin & the other thick on the LF. the stuck lug nut was on the RR. when I adjust em should I have the rear up on stands & it idling in gear & adjust till I hear a light tick during one revolution? EDIT BLU I just saw your post. car has been not driven in awhile but I dont remember pedal being that low. no changes at all in that time.