There is a great microfim in the LDS inventory which consists mostly of old wills from the Brew family. I recall these documents contained quite a bit of genealogic information. There is also considerable mention of the Brew family in the land valuation records contained on microfilm
from the Kilrush region. In particular, I've seen Brew family members owning property in Kilmurry McMahon Parish in the mid19th century. Stop at the nearest Family History Center and look at the microfiche in the Locality Index for County Clare.