In cars, ABS stands for "Anti-lock Brakes." Anti-lock brakes are designed with a car's regular braking system to keep wheels from locking up.
When a car loses traction on a slippery road, the brakes may lock up which can cause the car to spin out of control. The ABS system pumps the brakes automatically to prevent the wheels from locking up. The system works by changing the pressure of the fluid to ensure optimal performance. Not all vehicles are equipped with anti-lock brakes. Vehicles that are equipped with the system often have ABS light indicators that light up on the dash when the car is started.