Wheel Bearings; Service Brake Test; Parking Brake Test; Exterior Lighting Verification With Test Mode - PREVOST H3-45 VIP Owner's Manual

8-14 Care and Maintenance
Vehicles equipped with TPMS
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On vehicles equipped with the Beru Tire Pressure
Monitoring System (TPMS), it is better to use the
TPMS display as the primary reference to judge
when tire pressure needs adjustment.
The TPMS presents pressure readings of each tire
as a +/- deviation from the wanted target.
If a tire reads within +/- 3 PSI no adjustment is
needed.
If a tire reads -4 PSI and below, re-inflate by the
marked amount.
If a tire reads +4 PSI and above, deflate by the
marked amount.
Relying on the TPMS system is better than relying
on a hand gage since the TPMS is temperature
compensated and remain accurate no matter if the
tires are cold or hot.
Tires take up to 3 hours to get down to ambient
temperature after a ride. A common mistake
consists of checking pressure while the tires have
not fully cooled down which leads into under-
inflated tires. Relying on the TPMS eliminate this
mistake.
Running tires at optimal pressure reduce tire wear,
improve safety and fuel economy.

WHEEL BEARINGS

Check wheel bearing cover for overheating
(especially after using the service brakes) during
fuel stops by touching the wheel bearing cover.

SERVICE BRAKE TEST

Check for correct pressure build-up. Stop 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
INFORMATION DISPLAY" on page 1
Other features.

PARKING BRAKE TEST

Release parking/emergency brake. Pump 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 WITH
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).
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.
Stopping The Test Mode:
To stop the test mode, pull up the multi-function
lever once or turn the ignition OFF or remove the
parking brake.
"DRIVER
in Section 5
PA-1619 Owner's Manual H3-45 VIP
NOTE
Lighting test mode can also be initiated and
stopped using the DID menu "Exterior Lamp
Inspection". For more information, refer to
"DRIVER INFORMATION DISPLAY" on page 1
in Section 5 Other Features.
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.