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

60 Instruments and controls

Retarder (if installed)

The Volvo 9700 US/CAN gearbox may be
equipped with a "compact hydraulic" retarder
type. If equipped, the retarder helps to
decrease the bus speed and the load on the
service brakes. Its automatically engaged by
the initial movement of the brake pedal (even
before that the wheel brakes are applied)
or by a control lever at the right side of the
steering column.
The retarder operation can be general enable
or disable, through by a switch placed in the
dashboard (see the following section in this
manual: "Retarder enabled (if installed)",
page 36).
This switch has two positions as follows:
•
Position I — Switch downwards, the
retarder is disabled.
•
Position II — Switch upwards, the retarder
is enabled.
When the retarder its active, a symbol is
shown in the display.
DANGER
Avoid using the retarder on slippery roads
because of the risk of locking the wheels
and skidding (the retarder brakes only the
driving wheels). Failure to do so may be
lead to an accident, resulting in serious
personal injury or death.
Note: The retarder brake the main shaft
to connecting the drive axle with the
transmission and in this way, obtain a delay
effect on the drive wheels. If the bus is;
equipped with anti-lock brake system (ABS),
the retarder is automatically disengaged on
any signs of the wheels locking.
Note: Under normal driving conditions, the
retarder should not be disabled.
Retarder activation area in the brake pedal
(optional).
T3018117
Symbol shown in the driver display.
T1008547
Retarder enabled or disabled switch located
in the dashboard.
T0009004