I agree with what merlinextraligh had to say. It was very good and I wan't to emphasise that you should be descending in the drops. If your not comfortable in the drops then you need to change handlebars and adjust the bike untill you are. It realy makes that much difference.

When I'm descending in the drops I firmly push my hands into the inside curve of the bars and my left hand (rear brake) stays there and doesn't move. You hold firmly with the rear brake side hand and ONLY brake on the front. You can also push your weight rearward easily in this position.

Regards, Anthony