i have 98 cavalier back brake lock down.wassup?

You may have to get brake fluid flushed, refilled and bled. Sounds like contamination of fluid. Probably something in abs if equiped. When you put in gear you first have to apply brake. If your having problem removing drum there should be a little hole on rear bottom inside where you can turn adjuster to move shoes away from drum. Other than that maybe just rust.

Auto. trans.?