237
Driving
When no longer using the MX Engine Brake, return the steering column switch to the
'OFF' position.
Using the MX Engine Brake improves the braking performance. Keep the engine speed
high!
7.17 RETARDER
The retarder is a wear-resistant, hydraulic continuous brake. It is primarily intended for
use in prolonged braking, for example when decelerating from high speed on a level
road or when driving downhill. This reduces service brake wear.
WARNING! The retarder does not exert braking power at idling or low
speeds. Using the retarder as a park brake can lead to a collision,
resulting in injury and/or damage to the vehicle.
– Do not use the retarder as a park brake.
WARNING! The use of the service brake for prolonged braking can
result in overheating of the wheel brakes. This can lead to serious
damage to the wheel brakes and result in temporarily decreased brake
performance of the service brake and dangerous situations.
– Use the retarder for prolonged braking, for example when driving
downhill.
– If possible, use the service brake for relatively short braking
operations when driving downhill.
WARNING! The use of the retarder increases the temperature of the
cooling system. To avoid overheating of the cooling system, the
braking performance of the retarder might be reduced or even shut off.
This can lead to dangerous situations.
– If the retarder braking performance is reduced or shut off due to
overheating, use the service brake to reduce vehicle speed.
– Keep the engine speed high (more than 1500 rpm) to decrease the
temperature of the cooling system.
– Avoid overheating of the cooling system by not setting the steering
column switch higher than position A or B on long downhill slopes.
Brake in time by momentarily using the service brake and don't let
the vehicle speed increase too much.
Brake effect
The maximum braking performance from the retarder is not available at low vehicle
speeds.
DW63246305.book Page 237 Friday, March 22, 2019 4:54 PM
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