The word brew is a funny word. It is used in the context of beverages with several different meanings. Brew, alone, usually conjures up images of beer or coffee before tea. You can even verify that this is a widespread mainstream phenomenon by typing "brew" into google image search: there are many pictures of beer, a few of coffee, and none of tea.
However, once you're in the context of tea, the word brew is used liberally. As of writing this post, a google search for the phrase "brewing tea" yields 112,000 results, whereas "steeping tea" returns the more moderate 27,000. What is interesting, however, is that the more general "preparing tea" returns 179,000 results.
How do you feel about using the term brew for tea?