Section 12: BRAKE AND AIR SYSTEM
PA1562
7
FIGURE 4: FRONT SERVICE COMPARTMENT
12210
3.1.6 Kneeling Air Tank
The kneeling air tank is installed on vehicles
equipped with the Kneeling or Hi/Low-Buoy
options. It is located in the front wheelhousing
(Fig. 1 & 2), and is provided with a bottom drain
valve.
3.2 PING TANK
The ping tank may be located behind the tag
axle or in the engine compartment; in this case,
it is accessible through the engine compartment
R.H. side door. It is used to dissipate heat and to
reduce noise produced by the air compressor
cycling on and off.
4. AIR SYSTEM EMERGENCY FILL
VALVES
All vehicles come equipped with two emergency
fill valves that enable system pressurization by
an external source such as an air compressor.
The rear valve is located in the engine
compartment and is accessible from engine
R.H. side door (Fig 3). It is positioned close to
the door opening.
CAUTION
Maximum allowable air pressure is 125 psi
(860 kPa). Air filled through these two points
will pass through the standard air filtering
system provided by Prevost. Do not fill system
by any point on the system.
The front valve is located in the front service
compartment close to R.H. side of door frame
(Fig. 4).
These two air system emergency fill valves are
fitted with the same valve stems as standard
tires, and can be filled by any standard external
air supply line.
The rear air system emergency fill valve will
supply air for all systems (brakes, suspension
and accessories) while the front fill valve will
supply air for accessories only.
5. ACCESSORY AIR FILTER
FIGURE 5: ACCESSORY AIR FILTER 12088
This filter is located inside the front service
compartment (Fig. 4). Its main function consists
in filtering the air supplied to the accessory air
system, when connected to an external supply
line. Ensure filter is purged whenever supplying
the system with an external air line and at least
every 12,500 miles (20 000 km). To purge, open
drain valve (Fig. 4), let the moisture come out,
then close the drain valve.
5.1 FILTER ELEMENT REPLACEMENT
Replace filter element whichever of the following
occurs first: every 100,000 miles (160 000 km),
every two years, or whenever differential
pressure exceeds 15 psi (105 kPa) between
filter inlet and outlet ports. Check condition of all
three O’rings for damage. Replace when
necessary (Fig. 5).
5.2 CLEANING
Clean filter body and bowl with a warm water
and soap solution. Rinse thoroughly with clean
water. Blow dry with compressed air making
sure the air stream is moisture free and clean.
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