What component in an anti-lock braking system (ABS) prevents wheel lockup?

The hydraulic control unit (HCU) is pivotal in the functionality of an anti-lock braking system (ABS) because it regulates the brake pressure applied to each wheel. During situations where wheel lockup is imminent—such as heavy braking on slippery surfaces—the HCU modulates the brake pressure to prevent the wheels from stopping completely. This modulation allows the wheels to continue rotating, which maintains traction and helps the driver retain steering control. Thus, the correct identification of the HCU as the component that prevents wheel lockup is essential for understanding how ABS enhances vehicle safety by improving control during braking. This mechanism is crucial for enabling the vehicle to stop effectively while minimizing the risk of skidding.