brake drum

What is your question?

well my anti lock light came on about a week ago, then yesterday the truck had some noises and was feeling rough around the back wheels. going to inspect it, with the brake drum off, i pushed the brake pedal. didnt seem right so i liiked in the book, "caution, never depress the brake pedal with the drum removed" is what i read. the hydralic thing there seems to have moved to one side and will not return, any thoughts