Section 12: BRAKE AND AIR SYSTEM
PA1564
14
23. AIR SYSTEM TROUBLESHOOTING
The following list has been designed to help in
troubleshooting some of the most common
problems in the air system and main causes.
For air brakes troubleshooting, refer to “
Air
Brakes Troubleshooting”
in this section. For
more troubleshooting information, refer to the
manufacturer's brochures annexed to this
section.
Air pressure doesn't rise to, or doesn't maintain,
a normal setting:
o
Defective air gauge (registering incorrectly).
o
Excessive leaking in air system.
o
Reservoir drain cock open.
o
Governor poorly adjusted or defective.
o
Defective
compressor.
o
Worn compressor or excessive wear on
piston and/or ring.
o
Air pressure rises to normal setting too
slowly.
Excessive leaking in air system:
o
Clogged engine air cleaner.
o
Worn compressor or excessive wear on
piston and/or ring.
o
Engine speed too low.
Air pressure rises above a normal setting:
o
Defective air gauge (registering incorrectly).
o
Governor poorly adjusted or defective.
o
Restriction in line between governor and
compressor unloading mechanism.
Air pressure drops quickly when engine is
stopped:
o
Leaks in compressor discharge valve.
o
Leaks in governor.
o
Leaks in air lines.
o
Leaks in air system valves.
24. BRAKE OPERATION
The vehicle braking system uses both service
and parking air-operated brakes. The air system
is divided into two independent circuits to isolate
the front axle brakes and the rear axle brakes
(drive and tag), thus providing safe brake
operation in the event that one circuit of the
system fails. The primary circuit is connected to
the drive and tag axle brakes, while the
secondary circuit is connected to the front axle
brakes. The tag axle service brakes operate only
when the axle is in the normal driving (loaded)
position. The spring-type emergency brakes are
mounted on the drive and tag axles, and will
apply automatically if primary system pressure
falls below 40 psi (276 kPa).
Furthermore, brake application or release, which
is speed up by a pneumatic relay valve (R-12),
will start with the rear axles and be followed by
the front axle, thus providing uniform braking on
a slippery surface. The vehicle is also equipped
with an Anti-lock Brake System (ABS), detailed
later in this section.
Brake and air system maintenance consists of
periodic inspections. Check all parts for damage
and brake adjustment (refer to subsequent
headings in this section for more details). Ensure
all fasteners are tight (refer to “
Specifications"
for
recommended tightening torques).
25. AIR BRAKES
25.1 DISC
BRAKES
Knorr-Bremse SN7000
disc brakes are used on
all axles. The front and drive axle discs are
actuated by 24 square inch effective area air
brake chambers, while on tag axle, the brake
chambers have a 16 square inch effective area
for service brake and a 16 square inch effective
area for emergency/parking brakes. The
Knorr-
Bremse SN7000
brakes are supplied with
automatic clearance (slack) adjusters as
standard equipment for easier adjustment. For
more information on disc brake components and
maintenance, refer to the manufacturer's
brochure at the end of this section.
25.1.1 Disc Brake Pads
Brake pads have to be checked on a regular
basis depending on the vehicle operation. The
remaining thickness of the pads should never be
less than 3/32 in (2 mm). To check pad
condition without removing the wheel, verify the
position of guide bushing (6) relatively to guide
sleeve (4) (see Fig. 21). When guide sleeve is in
alignment with guide bushing, brake pad
thickness has to be checked more precisely with
the wheel removed. When replacing brake pads,
all four pads on an axle have to be changed at
the same time. There is no inner or outer pad,
Содержание LE MIRAGE XLII BUS SHELLS
Страница 1: ...COACH MANUFACTURER MAINTENANCE MANUAL LE MIRAGE XLII BUS SHELLS PA1564 1ST EDITION...
Страница 12: ...Section 00 GENERAL INFORMATION 10 PA1564 FIGURE 13 METRIC US STANDARD CONVERSION TABLE 00005...
Страница 13: ...Section 00 GENERAL INFORMATION PA1564 11 FIGURE 14 CONVERSION CHART 00006...
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Страница 348: ...Page No 18 Manual No NDS8 Spicer Speciality Axle Division Technical Publications Spicer Speciality Axle Division TP1193...
Страница 379: ...Section 12 BRAKE AND AIR SYSTEM PA1564 21 FIGURE 38 AIR OPERATED BRAKING SYSTEM WE...
Страница 380: ...Section 12 BRAKE AND AIR SYSTEM PA1564 22 FIGURE 39 AIR OPERATED BRAKING SYSTEM W5...
Страница 387: ...Section 12 BRAKE AND AIR SYSTEM PA1564 29 FIGURE 46 ABS 6S 5M CONFIGURATION...
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Страница 782: ...Section 16 SUSPENSION PA1564 22 FIGURE 26 SWAY BAR FRONT SUSPENSION 16138D FIGURE 27 SWAY BAR REAR SUSPENSION 16014...
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Страница 1083: ...Section 22 HEATING AND AIR CONDITIONING PA1564 15 FIGURE 16 REFRIGERANT CIRCUIT CENTRAL SYSTEM 22247...
Страница 1086: ...Section 22 HEATING AND AIR CONDITIONING PA1564 18 FIGURE 17 DOUBLE SWEEP EVACUATION SET UP...
Страница 1106: ...Section 22 HEATING AND AIR CONDITIONING PA1564 38 FIGURE 39 REFRIGERANT CIRCUIT SMALL SYSTEM 22350...
Страница 1108: ...Section 22 HEATING AND AIR CONDITIONING PA1564 40 FIGURE 42 CENTRAL HEATING SYSTEM COMPONENTS 22338...
Страница 1118: ...Section 22 HEATING AND AIR CONDITIONING PA1564 50 FIGURE 54 HEATER LINE SHUTOFF VALVES WE...
Страница 1119: ...Section 22 HEATING AND AIR CONDITIONING PA1564 51 FIGURE 55 SMALL HEATING SYSTEM COMPONENTS 22337...
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Страница 1125: ...Compressor 62 11052 Rev A WORKSHOP MANUAL for MODEL 05G TWIN PORT COMPRESSOR R...
Страница 1126: ...WORKSHOP MANUAL COMPRESSOR MODEL 05G TWIN PORT...
Страница 1149: ...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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Страница 1205: ...Section 24 LUBRICATION PA1564 5 FIGURE 1 LUBRICATION AND SERVICING POINTS ON INDEPENDENT FRONT SUSPENSION VEHICLES 24036_1...
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Страница 1224: ...Section 26 XLII SLIDE OUT PA1564 12 FIGURE 16 KEYLESS BUSHING INSTALLATION INSTRUCTION...