Volvo VNL Operator's Manual page 293

288 Brakes
Vehicle Speed Retardation Devices
When operating a tractor bobtail (with-
out a trailer) or on slippery roads, the
engine brake switch must be in the
"OFF" position. Failure to follow this
instruction can result in loss of vehicle
control and serious personal injury or
death.
WARNING
A vehicle speed retardation device (such
as a "Jake-Brake," "C-Brake," "Exhaust
Brake," etc.) is not intended to bring the
vehicle to a stop. A vehicle speed retar-
dation device is only intended to retard
the vehicle speed under certain condi-
tions.
NOTE! If a Volvo engine is equipped with
a Volvo Engine Brake, the brake will not
operate with full power until the engine
coolant temperature has reached 110 F
(45 C).
NOTE! It is normal for there to be a slight
delay in the application of a vehicle speed
retardation device. When using devices of
this type, be sure to think ahead and ana-
lyze conditions in order to use the device
properly.