So, do you really want to disable your Facebook Timeline huh?Some said, you'll just going to delete the Application that you have made from the time when you are enabling your Timeline.
But sad to say, It's not working anymore, and according to a research, It's not possible for now to disable it since what we have done is considered hacking and this Facebook feature is still on it's Beta Version.
I will give you an update as soon as possible when I already learned how to disable the Facebook Timeline... see yah! ツ