Finally convinced myself to get back out on my back. Just making sure every things tight and working OK and the back disk brake isn't working properly. What could the reasons be for this and how can I fix it?
If it isn't slowing the wheel at all, is the cable actually operating at the calliper end?
If it is slowing it, but not much, you'll need to adjust the pad width, which is generally pretty easy with either a screw driver or an allen key in the back of the calliper. Check out YouTube for videos on adjusting cable disks.