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Home >> Kia >> 2016 >> Optima Hybrid >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Active Hydraulic Boost (AHB) System (HEV) >> Active Hydraulic Boost (AHB) System >> Description And Operation >> AHB System Operation Principals >> 2. Brake operation

2. Brake operation

Fig 1: AHB System - Brake Operation
G11816748Courtesy of KIA MOTORS AMERICA, INC.

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.

NOTE: Level of brake force is decided by the pedal simulator with conducting measurement of the pedal stroke sensor. Release Mode: During discharging brake, OUT valve opens and IN valve closes; then, the high pressure of brake oil return back to PSU. At this time, CUT valve is ON and it prevents back flow of brake oil to IBAU.
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