PREVOST X3-45 User Manual

Controls and Instruments
46
OPERATING THE TRANSMISSION OUTPUT
RETARDER
The transmission output retarder may be
activated in two different ways depending on
whether the accelerator pedal is released or not.
Method #1: Operating the retarder using the
hand lever
With the retarder activated (retarder switch
depressed) and the accelerator pedal released,
move the output retarder lever clockwise from
the first to the sixth position. The efficiency for
each position is as follows.
NOTE
The output retarder lever is located on the right
side of the steering column.
Position Efficiency (%)
Initial 0
1
re
16
2
e
33
3
e
49
4
e
71
5
e
89
6
e
100
Method #2: Operating the retarder using the
brake pedal
With the retarder activated (retarder switch
depressed), the accelerator pedal released and
the output retarder lever in the initial position,
apply the brake pedal as if using the service
brake. The further the break pedal is depressed,
the more the output retarder is applied. Refer to
"Other Features" chapter for more information
about the transmission retarder.
NOTE
For vehicles equipped with the Antilock
Braking System (ABS), if the wheels start to
lock up on slippery roads, the output retarder
will automatically deactivate until the wheels
turn freely.
FOOT-OPERATED CONTROLS
FOOT-OPERATED CONTROLS 00023A
BRAKE PEDAL
The coach is equipped with a dual braking
system. The front brakes operate from a
different air pressure source from the drive and
tag axle brakes. The dual braking system
becomes a modulated emergency system if a
pressure drop occurs in the primary brake
system.
Service brakes are applied by depressing the
brake pedal. Braking increases with the amount
of pressure applied to the foot pedal. Refer to
Other Features chapter under Antilock Braking
System. When the brake pedal is depressed,
the brake lights turn ON automatically.
For safe and effective braking, the air system
pressure should reach at least 95 psi (655 kPa)
in both the primary and secondary circuits. A
warning light and an audible alert will sound
when the air pressure in either the primary or
secondary circuits drops below 66 psi (455 kPa).
If this occurs, stop the coach; determine the
cause of the pressure loss before proceeding.
The brake pedal can be used in conjunction with
the transmission retarder. Refer to Transmission
Output Retarder in this chapter.
DANGER
Immediately report any brake system problem
to your company or directly to the nearest
Prevost or Prevost-approved service center.
Do not "fan" or "pump" the brake pedal. This
practice does not increase brake system
effectiveness but rather reduces system air
pressure thereby causing reduced braking
effectiveness.

PREVOST X3-45 Specifications

General

Brand	PREVOST
Model	X3-45
Category	Buses
Language	English