I use regular old dot 3 fluid for brakes. I've never had any brake issues and my cars never failed to stop. It was recommended to me from Dave at Protrans to use Type F (any brand) in the 727 he built for my Charger. In the past I've used both the Dodge recommended fluid and Type F in 727 trans. Again I've never had a fluid related issue in any 727 in any of my cars or trucks that had a 727