Hitachi ZW 120-6 Operator's Manual page 213

Releasing Parking Brake
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WARNING:
 Once the parking brake is released, the machine
becomes impossible to stop with the brake system,
possibly resulting in personal injury or death.
 Before releasing the parking brake or connecting
the brake system, be sure to lock tires with wheel
stoppers.
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CAUTION:
 As soon as towing operation is complete, connect the
parking brake.
 Use towing only when moving the machine to a place
where the machine is inspected and/or serviced.
Avoid towing to move the machine over a long
distance.
Releasing the parking brake is made manually only when
the parking brake switch becomes inoperable due to any
abnormality or failure in the brake system such as a pump.
TRANSPORTING
6-7