PREVOST X3-45 COMMUTER User Manual

SECTION 12: BRAKE AND AIR SYSTEM
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DOB 1300-1556 | X3-45 Commuter PA-1648 Maintenance Manual Section 12 revised Jan 2021
12.1 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 60 psi
(414 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.
Maintenance and repair information on this valve is supplied in the
applicable booklet, found on your Technical Publications USB flash drive,
under reference number Bendix Service Data SD-03-3611.
12.2 EMERGENCY / PARKING BRAKE OVERRULE CONTROL
VALVE (RD-3)
A RD-3 control valve is used when the vehicle is equipped 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, found on your Technical Publications USB flash drive,
under reference number Bendix Service Data SD-03-3611.
12.3 FLIP-FLOP CONTROL VALVE (TW-1)
A flip-flop control valve mounted on the front service compartment is
provided to unload the tag axle air springs.
Maintenance and repair information on this valve is supplied in the
applicable booklet, found on your Technical Publications USB flash drive,
under reference number Bendix Service Data SD-03-3602.

PREVOST X3-45 COMMUTER Specifications

General

Engine	Volvo D13
Transmission	Allison B500
Fuel Type	Diesel
Length	45 ft (13.7 m)
Width	102 in (2.6 m)
Horsepower	500 hp
GVWR	54, 000 lbs
Height	141 in