Circuit/System Description
WARNING: This page is about a different car, the 2010 Pontiac G6. However, it is still accessible from the selected car via links, so may be relevant.
The electronic brake control module (EBCM) monitors inputs when the vehicle is stopping that it sees the brake pedal is pressed, the brake pressure increases, and the vehicle is slowing down, or when the vehicle is accelerating, the brake pedal is not pressed and the brake pressure does not increase.