7 -7
▶ Loss of control hazard!
-. Do not exceed 25 km/h (15 mph) with single-line pneumatic trailer braking systems.
Tractor/trailer combinations with dual-line braking systems may be used at higher
speeds, but you must comply with local regulations at all times. Failure to comply
could result in death or serious injury.
-. Do not load the trailer over the tractor/trailer combination maximum mass declared
by manufacturer.
Warning
① Dual Line System
z For a trailer with a dual line braking system,
connect the supply line hose to the red coupler
and the control line hose to the yellow coupler.
z Red line (brake supply line):
Air is supplied to the red coupler at full system
pressure. This is the brake supply line and
charges the reservoir(s) on the trailer. If the
trailer braking system is disconnected from the
tractor for any reason, the air pressure will fall to
zero and the trailer brakes will be applied.
z Yellow line (control line):
As the tractor brakes are applied, increasing air
pressure is supplied, via the yellow coupler, to
the control valve on the trailer until full system
pressure is generated. Application of the trailer
brakes is proportional to the pressure applied to
the tractor brake pedals.
Coupler (control)Coupler (supply)
Coupler (single)
▶ The dual line system will only operate if both the red and yellow lines are
connected.
NOTICE
② Single Line System
z If the trailer has a single line system, connect the
hose to the black coupler.
z A pressure of 550KPa (80 psi) is available at the
coupler at all times when the tractor brake
pedals and parking brake are released.
Application of the tractor brakes causes the
pressure to drop to zero allowing the trailer
brakes to be applied.
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