Traditional riding instruction says do all your braking with the bike straight up and down—before you turn. This technique certainly is safe, but it’s not the only way. Trail-braking is a technique where you stay on the brakes through the turn entrance, perhaps even all the way to the apex. You brake less and less as the apex grows closer, releasing the brakes as you accelerate out of the turn. Why? Racers like it because it's faster. It also makes it easier to tighten the radius towards the end of the turn if you need to avoid an unseen problem.