Improve your braking technique with these resources:
Better Braking (Bicycling magazine's tips for braking skillfully and avoiding crashes)
How to Brake on a Bicycle (Bicycling Quarterly's test-based tips for effective braking)
Braking and Turning Your Bicycle (Sheldon' Brown's wisdom on brakes with a focus on front vs. rear vs. together and brake setup)
Using Your Brakes (Bicycling Street Smart's guide to getting the best performance from your brakes)
How to Brake Like a Pro (Global Cycling Network's video demonstration of good braking technique & how to brake like a pro)