I've been searching, but so far no luck, so maybe you smart peeps can help me out.

I hear (and feel) a mild clunk or pop when I start pedaling hard. It only does it once and then it doesn't happen again until I brake with the rear brake (but never when I brake with the front).

I thought it might be the rear disc brake itself, but I have since inspected and re-tightened everything and it did not change a thing.

It feels like it could be coming from the BB/crank area or the rear hub, but I don't have any experience with taking those apart...so I don't know what I would be looking for.

I'd take it to the LBS, but I'm worried that they will have it more than a day (and I can't afford that since we are down to one car - which the wife takes - so I have to commute to work on my bike on the weekdays).

Any ideas would be appreciated.

I have a Felt V55 with about 1000 miles on it now, if that helps.