Volvo VHD - Manual (Page 247)

Brakes 241
Volvo Engine Brake (option)
The Volvo Engine Brake (VEB) has a
higher braking effect than the exhaust
brake. The engine brake is most effective at
high engine speeds (1500 to 2300 r/min). It
is automatically disengaged if engine speed
drops below 1100 r/min.
The engine brake function is operated by
one switch in the right hand switch cluster.
It works together with the exhaust brake to
provide two levels of braking power. The
switch has three positions: OFF, LOW and
HIGH. With the switch in position LOW,
only the exhaust brake is engaged. With the
switch in position HIGH, both the exhaust
brake and the compression brake are acti-
vated. For the engine brake to function, the
following must be in effect:
• The switch is ON
• Vehicle speed over 7.5 mph (12 km/h)
• Engine temperature over 110

F (43

C)
• Accelerator and clutch pedals are fully
released
• Engine speed over 1100 r/min
When the cruise control is engaged, the en-
gine brake automatically engages if the
selected cruise speed is exceeded by ap-
proximately 5 mph (8 km/h). The engine
brake is then disengaged when the speed
has returned to approximately 3 mph
(5 km/h) above selected cruise speed.
W3002303
Too Cold for Engine Brake (Volvo Engine Only)
Position 2 of the engine brake should not
be switched on until the engine has become
warm (over 110

F [45

C]). If position 2 is
selected and the engine is too cold, this
symbol will be shown (however, VEB is
not activated).
T3009355