Rolling Thunder is probably right. There is a chance that it might need adjusting, but it's most likely worn out e-brake shoes. It's a poor design in my opinion, but that's how it is. I actually did mine this past weekend. After I replaced my brake pads and e-brake pads mine still didn't hold quite right so I took it to NTB and paid the $30 to have them adjust it at that point. There is an adjustment for the pedal under the drivers side near the e-brake pedal that takes two people to adjust.
Truthfully, it's really not that bad of a job. I snapped some pictures with hopes of doing a tech write-up on this very subject since I came on the forum and asked the same question a few weeks ago. It only cost my about $180 to replace all the brakes in the rear, including the trip to NTB. If you have a little mechanical knowledge and some basic hand tools, it's really not that bad and can be done in a few hours. I'll try to write something up here in the next few days.