Hitachi ZW180 Technical Manual page 91

Parking Brake Indicator Control
Purpose: To light the parking brake indicator on the
monitor unit during parking brake operation.
Operation:
1. When the parking brake switch is turned ON, MC
confirms the signal of the parking brake pressure
sensor.
2. When pressure is below the set pressure, MC
transmits the signal to the monitor unit and lights
the parking brake indicator.
Monitor
Parking Brake
Indicator
ON
OFF
Parking Brake Switch
SYSTEM / Control System
ECM
MC
Monitor
Unit
NOTE: The parking brake of the vehicle body is
released if pilot pressure is routed.
NOTE: As for operation circuit of the parking brake,
refer to the SYSTEM/Electric System
group.
IMPORTANT: Be careful that in case the parking
Engine
T2-1-49
brake pressure sensor is abnormal,
traveling is possible although the
parking brake switch is ON and the
parking brake is applied as the park-
ing brake indicator is fixed to OFF
(release).
Trans-
mission
Parking Brake
Parking Brake
Solenoid Valve
Parking Brake
Pressure Sensor
T4GC-02-01-025