Service brake system
74
Operation: chassis
4
Operating the service brake for manoeuvring
A coupled trailer, but without connected
lines, can be manoeuvred by releasing
the service brake.
The trailer is automatically braked with
the service brake by venting the supply
line during the uncoupling process.
The service brake can be manually
released via the release valve.
The service brake does not replace the
screw parking brake function!
At a lower tank pressure of
approx. 2.5 bar the service
brake can no longer be released
(residual pressure
safeguarding).
When the supply line is recoupled to the
towing vehicle the released valve is
automatically switched to the drive
position (release valve is pressed out/
activated with excess pressure).
WARNING
Deactivate service brake with
release valve
The trailer may start moving
unchecked and roll over persons
- risk of accident!
Before releasing the service brake
check that the trailer is properly
coupled or secured with the screw
parking brake.
WARNING
Close release valve with
compressed-air tank empty
The trailer is not braked and may
start moving unchecked and roll
over persons - risk of accident!
Couple the brake line to the towing
vehicle with the compressed-air tank
empty.
WARNING
Park trailer only with activated
service brake
The service brake function may
diminish over time and the trailer
may start moving unchecked
and roll over persons - risk of
accident!
Secure a parked trailer with the screw
parking brake and wheel chocks.
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