PREVOST X3-45 COMMUTER User Manual

SECTION 12: BRAKE AND AIR SYSTEM
DOB 1300-1556 | X3-45 Commuter PA-1648 Maintenance Manual First release Oct 2020
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and then turn the nut clockwise to cage the
spring. Repeat on the opposite side.
DANGER
Make sure the release
stud is properly
anchored in spring plate receptacle prior to
caging the spring.
4. To manually reset the emergency/parking
brake, turn the nut counterclockwise.
Reinstall access plugs on the spring
chambers, and release stud tools in their
storage places.
19.3 BRAKE CHAMBER REMOVAL
WARNING
To prevent personal injuries, brakes should be
inoperative prior to working on any of their
components.
To prevent personal injuries, brake chambers
should be made inoperative by releasing
spring tension prior to disposal.
Use the following steps in conjunction with
Brake chamber Replacement procedure found
in Knorr-Bremse Pneumatic Disc Brake SN7
Service Manual Y006471.
1. Block the wheels to prevent the vehicle from
moving.
2. Safely support vehicle at the recommended
body jacking points.
3. To gain access to a given brake chamber,
the corresponding wheel can be removed
(refer to Section 13: "Wheels, Hubs and
Tires").
4. Exhaust compressed air from system by
opening the drain valve of each tank.
5. For the drive and tag axles brake chambers,
manually release spring brakes (refer to
"Emergency/Parking Brake, Manual
Release" procedure in this section).
6. Disconnect air line(s) from brake chamber.
7. Remove the cotter pin connecting brake
chamber and adjuster (drive axle).
8. Unbolt and remove the brake chamber from
vehicle.
19.4 BRAKE CHAMBER INSTALLATION
Reverse removal procedure, and then check
brake adjustment.
CAUTION
Always clean air lines and fittings, and coat
pipe threads with Teflon pipe sealant before
reconnecting air lines. Make sure the drain
hole of the brake chamber is in the lower
position for proper moisture evacuation.
19.5 BRAKE CHAMBER DISASSEMBLY
DANGER
Spring brake chambers, on drive and tag
axles contain an extremely high compressive
force spring, which can possibly cause serious
injury if special precautions are not taken
when working around this area.
To avoid such injury, the following
recommendations must be applied:
• Prevost recommends the installation of
a new spring brake chamber if it is
found to be defective.
• Spring brake
chamber maintenance
and/or repair must be performed by
trained and qualified personnel only.
•
Before manually releasing spring
brakes, visually check spring brake for
cracks and/or corrosion.
• On “MGM” brake chambers (drive axle),
make sure the release stud is properly
anchored in spring plate receptacle
prior to caging the spring.
• Never stand in the axis line of the spring
brake chambers, especially when
caging the spring.
WARNING
To prevent personal injuries, brakes should be
inoperative prior to work
ing on any of their
components.
1. Block the wheels to prevent the vehicle from
moving.

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