I hear the same thing when I have had the car sitting with the emergency brake on.
I start the car, lower the emergency brake, put the car in reverse and then start backing up. I hear the clunk right after I start moving.
Not sure what it is, but I don't like the sound. Could it be something like the hill brake that is applied when you are stopped at a light when uphill?
You know how if you come to a red light and your going uphill, once you stop you can take your foot off the brake completely and the car will stay there. I forget what its called, but I believe its a brake assist thing to help keep the car in place until you hit the gas.
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