Mercedes-Benz Zetros 2020, Operating Instructions Manual

Page: 107 / 212

This section contains important information on
the subject of brakes and is structured as fol-
lows:
R
Checking the compressed-air brake system
for leaks (
Y
page 105)
R
ABS (anti-lock braking system)
(
Y
page 105)
R
Parking brake (
Y
page 107)
R
Continuous brake (
Y
page 109)
Checking the compressed-air system
for leaks
G
WARNING
It is not possible to brake the vehicle if the
compressed-air brake system has a leak or
if there insufficient reservoir pressure. There
is a risk of an accident.
Do not drive the vehicle until the necessary
reservoir pressures have been reached and
the STOP lamp goes out.
In the event of loss of pressure while driving,
immediately bring the vehicle to a halt in
accordance with the traffic conditions.
Secure the vehicle using the parking brake.
Have the compressed-air system repaired at
a qualified specialist workshop.
Do not let anyone enter or exit the vehicle dur-
ing the test. This will help to prevent you from
mistaking pressure loss, due to air-sprung
seats or the level control system, for leakage.
X
Stop the vehicle on a level surface.
X Apply the parking brake.
X Use chocks to safeguard the vehicle against
rolling away.
Wheel chocks may only be used on the non-
steered axle of the vehicle.
X Release the parking brake.
X
Turn the key to the drive position in the igni-
tion lock.
X In the
Monitoring info
menu in the on-
board computer, call up the
Supply pres‐
sure submenu (
Y
page 78).
X Leave the engine running until the supply
pressure is approximately 10 bar.
X
Switch off the engine.
X Turn the key to the drive position in the igni-
tion lock after approximately 5 minutes.
A waiting time of at least 5 minutes is
required to eliminate pressure loss due to
auxiliary consumers, e.g. BlueTec
®
exhaust
gas aftertreatment.
X
Call up the Supply pressure submenu
again.
X Depress the brake pedal to effect a half
brake application – half of the pedal travel –
and hold it in this position.
X Read off the reservoir pressure after approx-
imately 1 minute.
X
After approximately 3 minutes, read off the
supply pressure again.
If after 3 minutes the on-board computer
shows a pressure loss of a maximum of
0.4 bar in the Supply pressure submenu,
the compressed-air brake system is free
from leaks.
ABS (Anti-lock Braking System)
General notes
ABS controls the braking pressure so that the
wheels do not lock under braking. This means
that the vehicle can still be steered while brak-
ing.
ABS is operational from walking pace, regard-
less of road surface conditions. If the road is
slippery, ABS intervenes even if you only brake
gently.
ABS display check
G
WARNING
If ABS is malfunctioning, the wheels could
lock when braking. The steerability and
braking characteristics are thus severely
impaired. There is an increased risk of skid-
ding and an accident.
Drive on carefully. Have the ABS checked at
a qualified specialist workshop as soon as
possible.
Brakes
105
Driving mode
Z