Also, when you are braking hard, remember that because as you brake, the weight of the bake is transferred forward, it is much easier to skid your rear tire than your front. Also, since the harder you brake with your rear, the less effective that tire is going to be at gripping the ground, because it has less weight on it. Therefore, you have to brake harder on your rear to tire than your front to get equivalent stopping power. That means that your back braking hardwear tends to wear faster than the front, you want to be braking with proper technique, i.e. 25% force to the rear, 75% to the front. This will extend the life of your pads and rims, and keep you safer. Have fun!