SK597-AT4
Driving
Truck
4-22
SPIERINGS MOBILE CRANES USER MANUAL V 1.2
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4.8.2.1.
Parking brake at trailer connection
If the truck is equipped with an optional
trailer connector
, the parking brake lever has a
test position
.
If a trailer with air brakes is attached, the brakes are activated after operating the parking brake of the
truck.
The regular braking system of the trailer is used by continuously pressed air.
However, it is possible that the braking capacity of the trailer reduces or even completely disappears
because of losses of pressed air.
To test whether the trailer combination remains unmoved on the parking brake of de truck only,
the parking brake lever must be pulled out of the parking position and moved further to the backward
position.
The trailer brakes are hereby released, so only the parking brakes of the truck are activated.
As soon as the parking brake lever is moved back to its parking position, there will be air pressure on
the braking system of the trailer again.
For more information, please refer to
4.8.2.2.
Parking brake as an emergency brake
If the air pressure for the service brake is too low, the parking brake can be used to slow down the
moving vehicle.
Move the parking brake lever dosed backwards:
-
Once the parking brake has been operated, this brake cannot be released till the air pressure is
restored again.
CAUTION!
Before leaving the driving position, always check (by putting away the truck-trailer
combination on a hill) if the combination remains unmoved when only the parking
brakes of the truck are activated.
CAUTION!
Move the parking brake lever dosed backwards when used while driving.
