Anti-lock Braking System
An anti-lock braking system (ABS) is a four-wheel drive system that prevents the wheel from locking through the monitoring of brake pressure. This gives the driver the ability to manage and control steering and stop within in a short distance. The system uses electronics and a hydraulic actuator to compare and adjust wheel speeds during braking.
The goal of anti-lock braking is maximize braking power while simultaneously preventing the wheel from locking and skidding.
Anti-lock braking systems are pedal actuated, dual-brake, hydraulic systems that contain ABS hydraulic control valves and an electronic control unit, a power brake booster, brake master cylinder, and brake tubes and hoses.
Large trucks and sport utility vehicles use a type of anti-lock braking system known as Rear Wheel ABS. In this system, the speed of the rear wheels is monitored during braking by regulating rear hydraulic line pressure. The system consists of three components, an electronic brake control module, an Anti-Lock Pressure Valve, and a Vehicle Speed sensor.