326 OPERATION
VEHICLE SPEED RETARDING DEVICES
DANGER
When operating a tractor bobtail (without
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.
Note: The vehicle ABS will automatically turn off the vehicle speed retarding device, IF one
of the sensed rear wheels is locking up as a result of vehicle speed retarding device operation.
The vehicle speed retarding device will be turned back on automatically when the wheels
become unlocked. Consider switching to a lower braking level if this occurs frequently.
A vehicle speed retarding device is not intended to bring the vehicle to a stop. A vehicle
speed retarding device is only intended to retard the vehicle speed under certain conditions.
Note: It is normal for there to be a slight delay in the application of a vehicle speed retarding
device. When using devices of this type, be sure to think ahead and analyze conditions in
order to use the device properly.
Volvo Variable Geometry Turbo Brake
The variable geometry turbo brake is standard with the Volvo 11F and 13F engine. It uses
software to close the variable geometry turbocharger to create retardation.
Note: For both variable geometry turbocharger and engine brakes, use a "one gear" driving
strategy when going downhill to keep engine speed up for effective braking (for example:
uphill in 7th gear and downhill in 6th).
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