Section 12: BRAKE AND AIR SYSTEM
PA1553
25
28.5
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 recommen-
dations must be applied:
o
Prévost recommends the installation of a
new spring brake chamber if it is found to
be defective.
o
Spring brake chamber maintenance and/or
repair must be performed by trained and
qualified personnel only.
o
Before manually releasing spring brakes,
visually check spring brake for cracks
and/or corrosion.
o
On “MGM” brake chambers (drive axle),
make sure the release stud is properly
anchored in spring plate receptacle prior to
caging the spring.
o
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 working on any of their
components.
1. Block the wheels to prevent the vehicle from
moving.
2. Safely support vehicle at the recommended
body jacking points.
NOTE
To gain access to a given brake air chamber,
the corresponding wheel can be removed
(refer to Section 13: "Wheels, Hubs and
Tires").
3. Exhaust compressed air from air system by
opening the drain valve of each reservoir.
4. For the drive and tag axles brake chambers,
manually release spring brakes (refer to
“
Emergency/Parking Brake Manual Re-
lease"
procedure in this section).
5. Remove clamp ring, remove and discard the
existing diaphragm. Install the new dia-
phragm squarely on body.
6. Reverse the procedure for assembly. Tap
clamp ring to ensure proper seating. Check
for proper operation before placing vehicle
in service.
29. ANTI-LOCK BRAKING SYSTEM (ABS)
This device has been designed to ensure
stability and permit steering control of vehicle
during hard braking, and to minimize its stopping
distance whatever the road conditions are. On
slippery roads and generally in emergency
situations, over-braking frequently induces
wheel lock. The anti-lock braking system
provides maximum braking performance while
maintaining adequate steering control on
slippery roads.
The ABS continuously monitors wheel behavior
during braking. Sensors on each wheel of front
and drive axles (tag axle is slave to drive axle)
transmit data to a four channel electronic
processor which senses when any wheel is
about to lock. Modulator valves quickly adjust
the brake pressure (up to 5 times per second) to
prevent wheel locking. Each wheel is therefore
controlled according to the grip available
between its tire and the road.
With this device, the vehicle is brought to a halt
in the shortest possible time, while remaining
stable and under the driver's control.
Since the braking system has dual circuits, the
ABS is also provided with a secondary system
should a fault develop in the ABS. Anti-lock
systems are a parallel system which does not
hinder brake functioning in case of failure.
Braking system functions in normal, non
anti-lock controlled operation during ABS
system failure.
The ABS system consists of two diagonally
related circuits, only the half of the system which
has sustained damage or other fault is switched
off (i.e. wheels return to normal non-ABS
braking). The other diagonal half remains under
full ABS control.
NOTE
ABS is active on service brake, transmission
retarder, Jake brake, but is inactive on
emergency/parking brake.
Summary of Contents for LE MIRAGE XLII
Page 1: ...COACH MANUFACTURER MAINTENANCE MANUAL LE MIRAGE XLII BUS SHELLS PA1553 ...
Page 2: ......
Page 12: ...Section 00 GENERAL INFORMATION 10 PA1553 FIGURE 13 METRIC US STANDARD CONVERSION TABLE 00005 ...
Page 13: ...Section 00 GENERAL INFORMATION PA1553 11 FIGURE 14 CONVERSION CHART 00006 ...
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Page 143: ...The ONLY Motor Coach Power Choice ...
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Page 185: ...Section 04 EXHAUST SYSTEM PA1553 3 FIGURE 2 EXHAUST SYSTEM INSTALLATION W5 04013 ...
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Page 492: ...Section 12 BRAKE AND AIR SYSTEM PA1553 20 FIGURE 38 AIR OPERATED BRAKING SYSTEM W0 WE ...
Page 493: ...Section 12 BRAKE AND AIR SYSTEM PA1553 21 FIGURE 39 AIR OPERATED BRAKING SYSTEM W5 ...
Page 500: ...Section 12 BRAKE AND AIR SYSTEM PA1553 28 FIGURE 46 ABS 4S 4M CONFIGURATION ...
Page 528: ...16 BW2158 Honeywell Commercial Vehicle Systems Company 4 2001 Printed in USA ...
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Page 1004: ...PROCEDURE NO PR00044 REVISION 00 Page 2 of 2 Slide out ...
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Page 1165: ...Section 22 HEATING AND AIR CONDITIONING PA1553 19 FIGURE 17 DOUBLE SWEEP EVACUATION SET UP ...
Page 1201: ...Section 22 HEATING AND AIR CONDITIONING PA1553 55 FIGURE 64 HEATER LINE SHUTOFF VALVES WE W0 ...
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Page 1209: ...Compressor 62 11052 Rev A WORKSHOP MANUAL for MODEL 05G TWIN PORT COMPRESSOR R ...
Page 1210: ...WORKSHOP MANUAL COMPRESSOR MODEL 05G TWIN PORT ...
Page 1233: ...Compressor 62 11053 Rev B SERVICE PARTS LIST for MODEL 05G TWIN PORT COMPRESSOR 1 2 3 4 5 6 R ...
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Page 1305: ...Section 26 XLII SLIDE OUT PA1553 11 ...
Page 1306: ...Section 26 XLII SLIDE OUT PA1553 12 FIGURE 16 KEYLESS BUSHING INSTALLATION INSTRUCTION ...