Pressure Decreases In The Circuit When Abs Is Operating; Pressure Increases In The Circuit When Abs Is Operating - SSANGYONG 2004 Rexton 2.7XDi Workshop Manual

Pressure Decreases in the Circuit when ABS is Operating

Low pressure
chamber
Pump
Even when the hydraulic pressure on each circuit is stable, the wheel can be locked as the wheel speed decreases.
This is when the ABS ECU detects the wheel speed and the vehicle speed and gives the optimized braking without
locking the wheels. In order to prevent from hydraulic pressure increases, the inlet valve is closed and the outlet valve is
opened. Also, the oil is sent to the low pressure changer and the wheel speed increases again. The ABS ECU operates
the pump to circulate the oil in the low pressure chamber to the master cylinder. This may make the driver to feel the
brake pedal vibration and some noises.

Pressure Increases in the Circuit when ABS is Operating

Low pressure
chamber
Pump
As the wheel speed increases, the inlet valve opens and the wheel's pressure increases due to the master cylinder
pressure. The oil in the low pressure chamber circulates to the wheel by the pump and the wheel speed decreases as
the hydraulic pressure at wheel increases. This operation continues repetitively until there are no signs that the ECU is
locking the wheels. When the ABS hydraulic pressure control takes place, there may be some vibration and noises at
the brake pedal.
ABS
REXTON SM - 2004.4
Inlet valve
Outlet valve
Inlet valve
Outlet valve
Pressure decreases
Pressure increases
CHANGED BY
EFFECTIVE DATE
AFFECTED VIN
8E1-13
Y220_8E1025
Y220_8E1026