Best advice for brakeless hill bombing: Turn right!!! I have always been brakeless but i normally keep my gear ratio in check. 42-14, then 46-15, then 48-17. BUt because of new cranks im pushing 53-17 untill i can get like a 50 or 51t chainring. If it gets hairy at the bottom of a hill just turn right.
Unless all the lanes are going left.