Care and Maintenance 8-17
PA-1628Operator's ManualH3-45 COACH
NOTE
Recommended tire inflation pressures are given in
the "Coach Final Record", placed in the technical
publications package supplied with the vehicle.
The cold tire inflation pressures are on the
Department of Transport certification plate located
on the L.H. console besides the driver’s seat.
When special tires are installed by Prevost on a
new vehicle, a special tire inflation chart is added
next to the certification plate.
WARNING
Do not exceed maximum inflation pressure. Incor-
rect tire pressure increases tire wear and could
lead to loss of driving control because of reduced
road handling. Check tire pressure regularly.
WARNING
If replacement tires are different from those spe-
cified on the certification plate, pressure must be
adjusted following manufacturer recom-
mendations.
l Vehicles equipped with BERU TPMS
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 "DRIVER
INFORMATION DISPLAY" on page39 in Section 5
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.
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