Hydraulic Brake Assist
WARNING: This page is about a different car, the 2009 Dodge Caliber. However, it is still accessible from the selected car via links, so may be relevant.
Brake Assist is programmed into the ESP® system. During a panic stop, a pressure sensor determines when the driver is doing so by measuring the brake pedal pressure application rate. A high rate of pedal pressure application causes the ESP® system to apply maximum available pressure to the brakes and the vehicle stops as quickly as available traction will allow.