Brake Operation
Apply Mode: During normal braking, IN valve becomes ON and opens; then, the high pressure generated by PSU is supplied to a caliper on each wheel by IBAU and the brake operation is engaged.
Release Mode: During discharging brake, OUT valve opens and IN valve closes; then, the high pressure of brake oil return back to reservoir. At this time, CUT valve is ON and it prevents back flow of brake oil to master cylinder.