PREVOST LE MIRAGE XLII BUS SHELLS, Руководство по обслуживанию

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Section 12: BRAKE AND AIR SYSTEM
PA1564
19
Total running clearance should be between
0.020 and 0.035 inch (0.5 and 0.9 mm). Smaller
clearances may lead to overheating problems.
FIGURE 34: RUNNING CLEARANCE
12116
25.1.11 Brake Tools
Four brake tools are available from Prévost to
facilitate disc brake maintenance:
a) #641321, Tappet with boot (item 13).
b) #641322, Caliper inner boot (item 9).
c) #641323, Caliper bushing (item 7).
d) #641435, Fork for boot tappet (item 13).
Maintenance tip
Using the following procedure, pad wear can be
determined without removing the wheel.
25.1.12 Checking 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 inch (2 mm). To check pad
condition without removing the wheel, verify the
position of guide bushing (6) relatively to guide
sleeve (4) (Fig. 35). When guide sleeve is in
alignment with guide bushing, brake pad
thickness must be checked more precisely with
wheel removed. When replacing the brake pads,
all four pads on an axle have to be changed at
the same time. There is no inner or outer pad,
since all pads are the same. Worn pads should
be replaced in the same position.
FIGURE 35: BRAKE PAD CHECK
12117
25.1.13 Torque specifications
For proper caliper maintenance, refer to the
following figures.
FIGURE 36: TORQUE SPECIFICATION
12145
FIGURE 37: TORQUE SPECIFICATION
11030
26. SAFE SERVICE PROCEDURES
Most recently manufactured brake linings no
longer contain asbestos fibers. Instead of
asbestos, these linings contain a variety of
ingredients, including glass fibers, mineral wool,
aramid fibers, ceramic fibers, and carbon fibers.
At present, OSHA (Occupational Safety and
Health Administration) does not specifically
regulate these non-asbestos fibers, except as
nuisance dust. Medical experts do not agree
about the potential long-term risks from working
with and inhaling non-asbestos fibers.
Nonetheless some experts think that long-term
exposure to some non-asbestos fibers could
cause diseases of the lung, including pneumo-
coniosis, fibrosis, and cancer. Therefore, lining
suppliers recommend that workers use caution
to avoid creating and breathing dust when
working on brakes that contain non-asbestos
fibers.