Zetor FORTERRA HSX Series, Operator'S Manual, Page: 109 / 222

The button for temporary deactivation of brakes of the trailer or semi-trailer
FHSX18N031
Prior to using the button for temporary deactivation of brakes of the trailer or semi-trailer, it is
always necessary to provide sufficient space in front of the tractor and behind the connected trailer
or semi-trailer where no obstacles or persons will be present for the case that the effect of the
parking braking will not be sufficient and the combination of vehicles moves.
The button for temporary deactivation of brakes of the trailer or semi-trailer can be used by the operator of
the tractor with the connected trailer or semi-trailer to make sure that the effect of the parking braking system
of the tractor with the connected trailer or semi-trailer when the tractor is braked with the hand brake is
sufficient.
If there is a tractor with the connected trailer or semi-trailer which is braked with the hand brake and the key
in the switch box is in the position (I), and we press the button for temporary deactivation of brakes of the
trailer or semi-trailer, the trailer or semi-trailer is deactivated for the time when the button is pressed (the
trailer or semi-trailer does not brake). When the button for temporary deactivation of brakes of the trailer or
semi-trailer is released, the brakes of the trailer or semi-trailer are activated (the trailer or semi-trailer
brakes).
Only the air brakes are deactivated by the button for temporary deactivation of brakes of the
trailer or semi-trailer.
Air brakes of trailers and articulated trailers
Control of air brakes of trailers (or semi-trailers) and
control of the tractor brakes is performed so that the
braking effect of both vehicles is synchronized.
The operating pressure is set by the pressure regulator to
the value of 740 ± 20 kPa. If the pressure drops below 550
- 40 kPa, secondary appliances are put out of operation by
the by-pass valve.
F11N022
DRIVING OPERATION
108