PREVOST X3-45 Multiplex User Manual

Section 12: BRAKE AND AIR SYSTEM
PA1562
12
11. EMERGENCY/PARKING BRAKE
CONTROL VALVE (PP-1)
A push-pull control valve mounted on the L.H.
lateral console is provided for parking brake
application or release. The spring brakes are
self-actuated whenever the control valve supply
pressure drops below 40 psi (275 kPa). In the
UP position, brakes are ON. In the DOWN
position, brakes are RELEASED. A protective
case around the knob prevents accidentally
releasing the brakes.
FIGURE 11: PP-1
12142
Maintenance and repair information on this valve
is supplied in the applicable booklet annexed to
this section under reference number
SD-03-3611.
Remove the valve the following way:
1. Drain the air system.
2. Access this valve by tearing out the finishing
panel, which holds the controls in place
(Fig. 11).
3. Disconnect the air tubes.
4. Remove the retaining screws.
5. Service or replace the valve.
6. Installation is the reverse of removal.
12. EMERGENCY / PARKING BRAKE
OVERRULE CONTROL VALVE (RD-3)
A RD-3 control valve is used with the optional
parking brake overrule system. In the case of
self-application of spring brakes due to a
pressure drop, the brakes can be released by
holding down this control valve. Maintenance
and repair information on this valve is supplied
in the applicable booklet annexed to this section
under reference number SD-03-3611.
FIGURE 12: RD-3 12136
13. FLIP-FLOP CONTROL VALVE (TW-1)
A flip-flop control valve mounted on the L.H.
lateral console is provided to unload tag axle air
springs (and to lift tag axle if vehicle is so
equipped). Another one controls the low-buoy
system (coaches only). It is a manually operated
"on-off" valve. Maintenance and repair
information on this valve is supplied in the
applicable booklet annexed to this section under
reference number SD-03-3602.
FIGURE 13: TW-1 12138
14. DUAL BRAKE APPLICATION VALVE
(E-10P)
The E-10P dual brake valve is a floor mounted,
foot-operated type brake valve with two separate
supply and delivery circuits. This valve is located
in the front service compartment (Fig. 14).
14.1 BRAKE PEDAL ADJUSTMENT
After brake pedal replacement or repair, adjust
the pedal to its proper position according to the
following procedure:

PREVOST X3-45 Multiplex Specifications

General

Length	45 ft
Width	102 in
Engine	Volvo D13
Horsepower	500 hp
GVWR	54, 000 lbs
Height	146 in
Sleeping Capacity	Varies based on floor plan
Water Capacity	Varies based on floor plan