There is a spring adjustment down by the hub, you can try firming that up so the cable spring has more tension and also make sure that the hub arm for the brake is in the correct position...if need be you can flip the hub arm to get a better adjustment loosen the arm by taking the bolt all the way out so the bolt doesn't strip and give it some wiggles as you pull to remove the arm.
I'd also make sure the cable is routed correctly and not binding because of a sharp turn. You should be able to make fine adjustments after that up at the handle bar on the lever perch. Oh also make sure the cable end down on the hub is pulled through the little casting on the hub and the spring on the other side of it if it isn't already. The funnel thing spoke mentions works very well to lubricate cables.
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