Malfunctions in driving mode
7.7 Troubleshooting
Operating manual GMK 6400 3 112 993 en 7 - 31
12.07.2013
7.7.5 Service brake malfunctions
Malfunction Cause Remedy
Lights up while
driving or goes out
after the engine is
started
The air pressure in one of the
two circuits has fallen below
5.5 bar (80 psi)
The vehicle can be driven
slowly to the next garage
The air pressure in both circuits
has fallen below 5.5 bar (80 psi)
1. Top up the compressed-
air supply on the filler con-
nection;
à p. 7 - 6
2. Tow the truck crane with
the towing bar;
à p. 7 - 6
Parking brake una-
ble to be released
Supply pressure is too low
à Building supply pressure,
p. 5 - 9
– Does not go out
–Off
Also lights up at
over 6 km/h
(4 mph)
The trailer ABS has failed Drive vehicle to next garage;
braking without ABS support is
still possible
The retarder cannot be
switched off
Fuse F2/6 blown
Retarder function switched off
Replace blown fuse;
à p. 7 - 20
Retarder function switched on;
à p. 5 - 44
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