When The Abs Fluid Pressure Is Decreasing: Notes
WARNING: This page is about a different car, the 2005 Mitsubishi Endeavor. However, it is still accessible from the selected car via links, so may be relevant.
The system closes the inlet solenoid valve to shut the fluid channel from the master cylinder, and opens the outlet solenoid valve to return the brake fluid from the wheel cylinders to the buffer chamber. This causes the wheel cylinder fluid pressure to decrease. Then the system activates the pump motor to return the brake fluid from the buffer chamber to the hydraulic unit reservoir.