The actuator on an anti-lock brake system (ABS) is known as an ABS actuator. This is an electronic device that receives a signal from the vehicle's computer to control the brake pressure so that the wheels will not become locked up. The computer monitors the signals on a vehicle's braking system several 100,000 times per second, in some cases. When the computer senses that a brake is beginning to lock up, the ABS actuator adjusts the brake pressure being applied to the wheel and prevents the wheel from locking.