PREVOST LE MIRAGE XLII BUS SHELLS User Manual

Section 12: BRAKE AND AIR SYSTEM
PA1553
12
19. PRESSURE PROTECTION VALVE (PR-4)
Maintenance and repair information on the
pressure protection valve is supplied in the
applicable booklet annexed to this section under
reference number SD-03-2010.
The air system includes two pressure protection
valves (Fig. 18). One valve is installed on the
manifold block, and insures at all times a
minimum pressure of 70 psi (482 kPa) in the
suspension air system in the event that a
pressure drop occurs in either the suspension
air system or accessory air system. This valve is
located in the front service compartment beside
the air filter.
FIGURE 18: PR-4 12174
The other valve is installed on the accessory air
tank, and insures a minimum pressure of 70 psi
(482 kPa) in the accessory air system in the
event that a pressure drop occurs in either the
suspension air system or braking air system
(refer to Fig. 1 for accessory air tank location).
20. LOW PRESSURE INDICATOR (LP-3)
Maintenance and repair information on the low
pressure indicators is supplied in the applicable
booklet annexed to this section under reference
number SD-06-1600.
The air system includes two low pressure
switches (Fig. 19), both located on the
pneumatic accessory panel in the front service
compartment. One serves for the parking brake
signal, its pressure setting is 66 ± 6 psi (455 ±
40 kPa). The remaining pressure switch
monitors the parking brake telltale panel
indicator; its pressure setting is 30 psi (205
kPa).
FIGURE 19: LP-3 12078
21. SHUTTLE-TYPE DOUBLE CHECK
VALVE (DC-4)
Maintenance and repair information on the
shuttle-type double check valve is supplied in
the applicable booklet annexed to this section
under reference number SD-03-2202.
The double check valve is located on the
pneumatic accessory panel in the front service
compartment. In the event of a pressure drop in
either the primary or secondary system, this unit
will protect the emergency /parking brake control
valve and the intact portion of the air system
from pressure loss.
FIGURE 20: DC-4 12134
22. AIR HORN VALVE
The air horn valve is located in the L.H. front
service compartment. The air horn button is on
the center of the steering wheel. Refer to
section 23 “ACCESSORIES” for more
information.

PREVOST LE MIRAGE XLII BUS SHELLS Specifications

General

Brand	PREVOST
Model	LE MIRAGE XLII BUS SHELLS
Category	Buses
Language	English