I would strongly suggest not running brake cleaner through any pneumatic tools. Seals can and eventually will break down from that. I understand you got lucky, but I work with these tools every day as a manufacturer/vendor.
If the seals are going to break down from seeing a little brake cleaner once every year or two they weren't worth a shit to begin with. Of all the different cleaners found in a shop brake cleaner is probably the least likely to hurt something.