Retarder (If Installed) - Volvo 9700 US/CAN 2016 Driver's Handbook Manual

120 Starting and driving

Retarder (if installed)

The Volvo 9700 US/CAN bus may be
equipped with an auxiliary brake equipment
called "retarder". The function of the retarder
is to supplement the service brake acting
directly on the main drive shaft that connects
the shaft from transmission output with the
carrier decreasing its speed, and thus serve an
additional assistance brake.
The retarder works without a problem
together with the VEB (engine brake patented
by Volvo), EPG (exhaust gasses shutter) and
the service brake for obtain a longer delay
effect to braking more efficient, preventing it
from overheating the service brake.
To completely retarder enable or disable, its
count with a switch in the dashboard. But,
to retarder activated or deactivated while
driving use the control lever located at the
W0089959
steering column right side slightly above to
the wipers control lever.