Service Brake Test; Parking Brake Test; Exterior Lighting Verification - PREVOST X3-45 COACH 2018 Operator's Manual

Care and Maintenance
8-14

SERVICE BRAKE TEST

Check for correct pressure build-up.
engine and check pressure gauge. Pressure
loss should not exceed 3 psi/min (21 kPa/min)
with engine stopped and without brake pedal
applied. Air loss should not exceed 7 psi/min (48
kPa/min) with engine stopped and brake pedal
fully applied.
A convenient way to proceed to the service
brake test is with the use of the DID menu "Air
Leakage Monitor". For more information, refer to
"Driver Information Display (DID) Menus" in
Section 5 Other Features.

PARKING BRAKE TEST

Release parking/emergency
service brake pedal until air pressure drops to
65 psi (448 kPa). Make sure the warning buzzer
operates and that the emergency brakes apply
(the control valve knob lifts up). Allow air
pressure to reach 95 psi (655 kPa) before
releasing parking brake.
Driving the vehicle while the parking brake is
applied should not be possible.

EXTERIOR LIGHTING VERIFICATION

Exterior Lighting Test Mode
This useful function allows quick verification of
the vehicle exterior lights.
Activating the test mode:
When the vehicle is stationary (parking brake
applied), pull up the multi-function lever 3 times
within 3 seconds to activate the test mode. This
test can be done when the engine is not running
providing that the battery charge is sufficient
(above 24.0 volts).
The telltale panel alarm emits a sound each
second to remind that the test mode is in
progress.
NOTE
You can also initiate and stop the exterior
lighting test mode with the use of the DID
menu "Exterior Lamp Inspection". For more
information, refer to
Display (DID) Menus" in Section 5 Other
Features.
Stopping the test mode:
Stop
brake. Pump
"Driver Information
PA1627 X3-45 Operator's Manual
To stop the test mode, pull up the multi-function
lever once or turn the ignition OFF or remove
the parking brake.
NOTE
The test mode is useful to check the operation
of the multiplex outputs and the exterior lights.
It doesn't test the functionality of the
commands related to the exterior lighting. For
a complete testing, the directional signal
commands, the headlights commands and the
brake pedal have to be checked before. Once
these commands tested, activate the test
mode to check the exterior lighting.
Using the test mode:
First, test the functionality of the commands
related to the exterior lighting:
 Activate the right directional signal and check
that the corresponding cluster telltale light
illuminates.
 Activate the left directional signal and check
that the corresponding cluster telltale light
illuminates.
 Activate the hazard warning flashers and
check that the corresponding cluster telltale
lights illuminate.