What is the Anti-Lock Braking System?
The anti-lock brake system (ABS) is a safety system that allows the wheels on a motor vehicle to maintain tractive contact / friction with the road surface no matter how hard the driver pushes the brake pedal. The ABS does this by preventing the wheels from locking up (stopping rotation). This is important because when the wheels on your car lock up, you can go into an uncontrollable skid. As such, the ABS generally offers improved vehicle control and decreases stopping distances on both dry and slippery surfaces by allowing drivers to brake and steer at the same time thereby avoiding an accident. The video below provides a good demonstration of the concept.