Group 25 Intake and Exhaust System Design and Function
Engines with VEB
When the engine brake ON/OFF switch is in the ON po-
sition, the engine brake is activated according to the
position of the engine brake HI/LO switch.
With the HI/LO switch in the LO position, only the ex-
haust pressure governor is activated and is subject to
the same conditions as for engines with an exhaust
brake only.
With the HI/LO switch in the HI position, the VEB is
activated (both the exhaust pressure governor and com-
pression brake are switched on).
In addition to satisfying exhaust brake prerequisites, the
following conditions must be met:
•
Coolant temperature above 70
C (158
F).
•
Vehicle speed must be greater than 12 km/h
(7.5 mph).
•
Engine temperature must be above 43
C (110
F).
W2001002
Fig. 20: Engine brake switches for WG and AC
Dual two-position switches:
1 ON/OFF
2 HI (VEB)/LO (exhaust brake)
For VN/VHD, engine exhaust brake switches are located
on the dash (5); see Fig. 21: Engine brake switches for
VN/VHD, page 20.
W3004361
Fig. 21: Engine brake switches for VN/VHD
1 Left Dash Switches
2 Driving Light Switches
3 Pneuamtic Switches
4 Auxiliary Switches
5 Right Dash Switches
20
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