Pressure Dump Mode

When the wheel deceleration is under the threshold and the wheel spin is reduced under a slip threshold, applied brake pressure is reduced to get an optimum traction force.
Outlet valve is open to release the brake pressure and inlet valve is closed to block the pressure increase from the motor pump.
Hydraulic shuttle valve (HSV) remains opened, TC valve is ON.
Motor is ON, to dump the brake fluid being released from the lock-up wheel.

Fig 1: Pressure Dump Mode State Chart

Courtesy of KIA MOTORS AMERICA, INC.

Fig 2: Pressure Dump Mode State Diagram

Courtesy of KIA MOTORS AMERICA, INC.