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Home >> Kia >> 2012 >> Optima Hybrid >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Active Hydraulic Booster (AHB) System - HEV >> Description and Operation >> Description >> AHB System Operation Principals >> 2. Base Brake Function

2. Base Brake Function

During normal braking, NO VALVE 1, 2, and 3 are in the ON status and closed. The pump either turns on or off according to the chamber status.

At this point, the NC VALVE 1 and 2 become ON and opened. The pressure generated by the pump is supplied to the boosting chamber and pressure is formed in the cylinder.

AHB System NO VALVE 1 NO VALVE 2 NO VALVE 3 NC VALVE 1 NC VALVE 2 * Motor
Mode ON(closed) ON(closed) ON(closed) ON(opened) ON(opened) ON/OFF
NOTE:
  • Motor: when charging Accumulator
Fig 1: AHB System Operation Diagram - Base Brake Function
G08308656Courtesy of KIA MOTORS AMERICA, INC.