3. TRAILER RUNNING GEAR AND USAGE INSTRUCTIONS
• 1.Toolbox
• 2.Kingpin
• 3.Control panel
• 4.Wheel holder
• 5.Lock arm
• 6.Rotating beacon, Warning plate
• 7.Extension bracket
• 8.Lashing rings
• 9.Tires
• 10.Manometer
• 11.Rotating beacon, Warning plate
3.1. Brake system
3.1.1. Air couplings
The main connection between the truck
and trailers is air couplings.
Generally, 3 different types of air cou-
plings are used in the trailers. These 3
types of air couplings have the same
function but with different shapes and
connections. There are 2 different air
supply lines in the system.
• Brake Line (Yellow)
• Supply Line (Red)
Service Line: It is the pneumatic line
where the pneumatic brake signal from
the truck is transmitted.
Supply Line: It is the pneumatic line
where the compressed air needed by the
trailer is transmitted from the truck.
According to the type of vehicle, your ve-
hicle can be equipped with one or two
different types of air couplings.
• Standard Couplings (Palm)
• Duomatic Coupling
• C (UK) Couplings
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