Optimized Hydraulic Braking
WARNING: This page is about a different car, the 2012 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.
Optimized hydraulic braking is a system built into the ABS module to aid in bringing the vehicle to a safe, controlled stop in the event of severe vacuum loss at the brake booster. The ABS module uses a sensor to continually monitor the vacuum in the brake booster. If low vacuum is detected during a braking event, the ABS module activates the pump motor in the HCU to assist with vehicle braking.