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Coupling and uncoupling
NOTE: When coupling, check the coupling head rubbers of the air pipes of
both the truck and the (semi-) trailer for possible damage.
WARNING! Some types of (semi-) trailer do not brake automatically if
the air reservoirs are empty. This makes it possible to drive away with
an unbraked (semi-) trailer. This can lead to very dangerous situations.
– Connect the (semi-) trailer correctly
– Make sure that the air reservoirs are filled before driving off.
– Before starting a journey check if the (semi-) trailer brake operates.
When the red coupling head is properly connected, the brake system of the (semi-)
trailer starts filling. This can be noticed quite clearly. At the same time there is a marked
drop in pressure in the air reservoirs of the towing vehicle. See section 'Brake system
air dryer' in chapter 'Inspections and maintenance'.
– red = emergency line coupling head
– yellow = service line coupling head
WARNING! If the yellow and/or red brake pipes have not been
connected, the (semi-) trailer cannot brake. This can lead to very
dangerous situations.
– Always connect the yellow and red brake pipes correctly.
6.5 CONNECTING THE ABS OR EBS CONNECTOR OF A
(SEMI-) TRAILER
A (semi-) trailer with ABS is fitted with an anti-lock braking system.
A (semi-) trailer with EBS is fitted with an electronically controlled brake system, which
incorporates ABS.
Both versions are connected to the extra socket of the ABS/EBS system on the truck
with a special plug.
If this plug is not connected, a yellow warning will appear on the master display.
Consequences of not connecting a (semi-) trailer EBS to a truck EBS via the ABS/EBS
plug:
– no load-dependent brake control;
– no ABS (depending on (semi-) trailer EBS system version);
– no EBS control;
– full brake action always maintained, regardless of load.
ABS: Anti-lock Braking System
EBS: Electronically controlled brake system
DW63246305.book Page 194 Friday, March 22, 2019 4:54 PM
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