Mercedes-Benz Atego, Руководство пользователя, Страница: 84 / 131

82
Description and roadside assistance
Guidelines for Breakdown Services (Subject to technical modifications)
i
Brake system
The tire inflation connection
1
is located on the compressed air drier. If the compressed air system is filled via
the tire inflation connection
1
, the compressed air is neither cleaned nor dried. The pressure safeguard of the
pressure regulator is bypassed.
The maximum filling pressure of 12.5 bar must not be exceeded.
If the pressure in the towing vehicle is too low, brake circuits 1 and 2 can be filled directly via the corresponding
test connections (
m
or
n
) on the four-circuit protection valve.
Releasing the spring-loaded parking brake
If there is no compressed air supply, the spring-loaded parking brake cannot be released. The emergency
release devices allow the spring-loaded parking brake to be released pneumatically or mechanically.
Releasing the spring-loaded parking brake pneumatically
If it is not possible to fill the system via the tire
inflation connection or the coupling head
(see page 81), circuit 3 (see page 78) can be filled
via the filling valve.
On vehicles manufactured from mid-2000 onwards,
the filling valve
2
is replaced by a test
connection
1
.
Do not confuse the filling valve
2
with a test
connection
1
. The filling valve
2
has a red dust
cap with a wide rubber lip. The rubber lip bears the
inscription "Emergency release connection". When
the dust cap is removed, you will see the valve which
is flush with the threaded connection. The valve in
the test connection
1
protrudes.
!
Compressed air that has not been cleaned and dried can lead to malfunctions and/or damage in the
compressed air system. When filling the compressed air system, make sure that no dirt and no damp air is
allowed to enter the compressed air system.
Risk of accident G
Before releasing the spring-loaded parking brake, secure the vehicle with wheel chocks to prevent it from
rolling.
The spring-loaded cylinders of the parking brake must be restored to the operational state before the vehicle
is operated.