I found these aswesome Zbrush brushes/ alphas by Paul Tosca for sculpting damage.
The brushes can be downloaded through this link (I`ve reuploaded them to mediafire to save on traffic for Paul).
These are super useful and should help you save some time if you need to sculpt damage. Here is an example asset that Paul created with these:
You can read the entire polycount thread here with many more images and examples on how they have been used.
Thanks to Paul for sharing!