Volvo VNL 780 Operator's Manual page 121

INSTRUMENTS AND CONTROLS 111
Note: It is normal for a slight delay to occur in the application of a vehicle speed retarding
device. When using a device of this type, be sure to think ahead and analyze conditions in
order to use the device properly.
Several types of engine brakes can be installed or are standard on certain engines. All are
used to reduce wear on the vehicle brake linings.
Several types of engine brakes can be installed or are standard on certain engines. All are
used to reduce wear on the vehicle brake linings.
Volvo Variable Geometry Turbo Brake VN, VHD
The variable geometry turbo brake is standard equipment on the Volvo 11F and 13F engines.
Software is used to close the variable geometry turbocharger, creating retardation. The
switch for exhaust brake has two positions: ON/OFF.
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Volvo Engine Brake I-VEB
The Volvo Engine Brake (I-VEB) works together with the variable geometry turbocharger to
provide retarding horsepower at low engine rpm. The I-VEB is standard equipment on the
Volvo 16F engine and optional on the 13F and 11F engines. The I-VEB has a six position
control located on the steering column, just forward of the wiper stalk.
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