SECTION 12: BRAKE AND AIR SYSTEM
DOB 2490-2789 | X3-45 Commuter PA1605 Maintenance Manual (Final Version – Rev.2 April 2016)
21
Refer to Knorr-Bremse Pneumatic Disc Brake
SN7 Service Manual included on the technical
manuals CD for additional brake disc visual
checks.
25.5
CALIPER RUNNING CLEARANCE
The Knorr Bremse/Bendix air disc brake is
designed to move freely, with minimal force. By
pushing and pulling the caliper in an axial
direction by hand (see arrows in Figure 34), a
movement of 0.6 - 1.1 mm must be possible.
If, even using a high level of hand pressure (no
tools), the caliper is not moveable, the caliper
guidance must be further examined.
FIGURE 34: CALIPER AXIAL DIRECTION
25.6 TORQUE
SPECIFICATIONS
For proper caliper maintenance, refer to the
following figures. For other tightening torques,
please refer to ZF and Knorr-Bremse literature.
FIGURE 35: CALIPER CARRIER MOUNTING BOLTS
TORQUE SPECIFICATION - I-BEAM AXLE
FIGURE 36: CALIPER CARRIER MOUNTING BOLTS
TORQUE SPECIFICATION - ZF A132 DRIVE AXLE
FIGURE 37: CALIPER CARRIER MOUNTING BOLTS
TORQUE SPECIFICATION - TAG AXLE
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.
