Chevrolet Impala ltz 2010 parking brake

Ok. It's something that you have to look at.

If you are stumped on what a "Drum in a Hat" is, it is a small old fashion brake that is small, sits in the center of the disk rotor and is used for a parking brake. You have to look at it to see. Either remove the rear wheel or go under and look at the brake itself. Picture a hat with a flat brim. In the center of the brim will be the part that fits over and covers the head of the wearer. Now picture a disk brake rotor with a center raised to hold two brake bands inside it. That is what a "Drum in a Hat" is.