Subaru 2002 Impreza Service Manual page 322

ANTI-LOCK BRAKE SYSTEM (ABS)
ABS
4. PRESSURE "INCREASE" CONTROL (ABS ACTIVE)
Both the inlet and outlet solenoid valves are de-energized, which means that the inlet port of the
inlet solenoid valve is open, whereas the outlet port of the outlet solenoid valve is closed. So the
fluid pressure generated in the master cylinder is transmitted to the wheel cylinder and increased
fluid pressure in the wheel cylinder applies the brake with a larger force.
During this phase of ABS operation, the pump motor continues operating.
NOTE:
For simplicity of explanation, operation of the hydraulic control unit is represented by operation
of a single wheel circuit.
ABS-I 6