Rear Brake Cylinder Replacement Problems

I am trying to replacet he rear brake cylinder on my 2002 cavalier. How in the world do you get it off the backer plate that is attached to the hub? I have all of the hardware removed that holds it in place. I have also removed the fitting, and the blead screw. I have even gone as far as removeing the hub from the swing arm. As far as I can tell the backer plate has to be removed from the hub but with constant hammering I am afraid of braking the abs sensor. Has anyone had any luck removing a rear wheel brake cylinder??

<LI type=1>Remove the brake pipe (2) from the wheel cylinder (1).

Important

Install a rubber cap or plug to the exposed brake pipe fitting end in order to prevent brake fluid loss and contamination.

<LI type=1>Plug the open brake pipe end. <LI type=1>Remove the brake drum. Refer to Brake Drum Replacement (http://127.0.0.1:9001/servlets/CellHandler?CellId=12358&RefDoc=785690&evc=sm) . <LI type=1>Remove the brake shoes. Refer to Brake Shoe Replacement (http://127.0.0.1:9001/servlets/CellHandler?CellId=12389&RefDoc=785690&evc=sm) . <LI type=1>Remove the wheel cylinder bolts.
Remove the wheel cylinder.