Engine Brake; Volvo Engine Brake (Veb) - PREVOST H3-45 2023 Operator's Manual

5-12 Other Features
released. The braking level for each position is as
follows:
FIGURE 1: TRANSMISSION RETARDER CONTROL
STALK
Position Braking level (up to)
1
2
3
4
5
6
NOTE
If the wheels start to lock up on slippery roads,
the output retarder will automatically deactivate
until the wheels start to turn.

ENGINE BRAKE

WARNING
A vehicle speed retarding device (such as
engine brake) is not intended to replace the
service brake systems on your vehicle nor
intended to bring your vehicle to a stop. A
vehicle speed retarding device is only intended
to reduce the speed of your vehicle under
certain conditions.
Several types of engine brake can be installed
or are standard on certain engines. All are used
to reduce wear on the vehicle brake linings.
17 %
33 %
50 %
67 %
83 %
100 %
PA-1652 Operator's Manual H3-45 Coach
WARNING
When descending significant grades, use the
service brake as little as possible. If the engine
does not slow the vehicle to a safe speed, apply
service brake and shift to a lower range. Let the
engine (and engine brake) slow the vehicle. Keep
brakes cool and ready for emergency stopping.

VOLVO ENGINE BRAKE (VEB)

When running in AUTO mode (position A), the
engine brake is gradually applied to 100% of the
braking power when the driver pushes the brake
pedal. Since AUTO mode will not reduce vehicle
momentum unless the brakes are applied, it will
have no impact on fuel consumption.
The driver can also choose two other modes
using the engine brake control stalk;
Position 1 - Engine brake LOW
Position 2 - engine brake HIGH
When set to the engine brake LOW mode, 50% of
the engine brake power will be applied when the
driver releases the accelerator pedal. Using
engine brake HIGH will apply 100% of the braking
power.
It must be noted that since engine brake LOW
and engine brake HIGH will reduce vehicle speed
upon release of the throttle pedal, they may
negatively impact fuel consumption if used for
extended periods of time.
FIGURE 2: ENGINE BRAKE CONTROL STALK