78
Vehicle Dynamics and Driver Assist Systems
May 2017
Normal Braking
Since both solenoids are not energized, fluid pressure generated in the master cylinder is
transmitted directly to the wheel cylinder/caliper. This fluid path/valve state also represents
conditions when the VDC system is inactive due to a malfunction.
Normal Braking
Pressure Increase Mode
During Pressure Increase mode, the H/U motor pump is energized to produce additional
hydraulic pressure. Since the inlet valve is open and the outlet valve is closed, pressure is
increased in the wheel cylinder/caliper.
Pressure Increase
Item Electrical State Mechanical State
Inlet Valve Not energized Open
Outlet Valve Not energized Closed
Motor Pump Energized ON
M
FROM MASTER CYLINDER
INLET
PORT
OPEN
OUTLET
PORT
CLOSED
RESERVOIR
CHECK
VALVE
INLET SOL. VALVE
ELECTRIC
CURRENT IS OFF
WHEEL
CYLINDER
ELECTRIC
CURRENT IS OFF
OUTLET SOL. VALVE
MOTOR
PUMP
DAMPER
CHAMBER
Pressure Increase Mode
3-58
3-57
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