Section 12: BRAKE AND AIR SYSTEM
Section 12 Updated Sept. 2015 X3-45 Commuter PA1593 DOB 2400-2489 17
If, even using a high level of hand pressure (no
tools), the caliper is not moveable, the caliper
guidance must be further examined.
FIGURE 26: RUNNING CLEARANCE 12116
27.4 TORQUE SPECIFICATIONS
For proper caliper maintenance, refer to the
following figures.
FIGURE 27: CALIPER CARRIER MOUNTING BOLTS
TORQUE SPECIFICATION – TAG AXLE & FRONT I-BEAM
AXLE (FRONT AXLE SHOWN)
12145
FIGURE 28: CALIPER CARRIER MOUNTING BOLTS -
MERITOR DRIVE AXLE
FIGURE 29: TORQUE SPECIFICATION 11030
28. 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.
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