17
GUIDE PIN SEAL INSPECTION
Caliper Guide Pin Seals
The long bearing side guide pin (5) is sealed with the cover
(10) and with the inner boot (9). See Figure 28. Note: It
may be necessary to remove the pads to inspect the inner
boots (9) if pad wear is minimal. The guide pin (4a, 4b,
or 4c, depending on the style) is also sealed with an inner
boot (9) and a cover (style C), or a flexible rubber wear
indicator in the case of style A guide pins.
Inspect the above components, and if damage is found,
replace the caliper/carrier assembly. No kits are available
at this time for Guide Pin Seals.
TAPPET AND BOOT ASSEMBLY
INSPECTION
In order to inspect the tappet and boot assembly, it may
be necessary to remove the pads (12) (see Page 18) and
advance the shear adapter (61) clockwise (see Page 15)
until the boots are clearly visible.
CAUTION: NEVER EXTEND THE TAPPET MORE THAN
1.18 in. (30 mm). Over-extending the tappet will result
in the tappet losing engagement with the threads of the
synchronizing mechanism. Since the mechanism can
only be set at the manufacturing plant, the CALIPER/
CARRIER ASSEMBLY MUST BE REPLACED if this
happens.
Inspect the tappet and boot assemblies (13) for evidence
of damage, corrosion, etc. The penetration of dirt and
moisture into the brake can lead to corrosion and impair
the function of the air disc brake. Replace as necessary
(see Pages 22-24).
After re-installing a wheel according to the vehicle
manufacturer’s recommendations, please ensure that there
is sufficient clearance between the tire inflation valve stem,
the caliper and the wheel rim, to avoid damage.
WARNING: Not all wheels and valve stems are
compatible with Bendix Air Disc Brakes. Use only
wheels and valve stems approved by the vehicle
manufacturer to avoid risk of valve stem shear and
other compatibility issues.
FIGURE 30 - TAPPET EXTENSION LIMIT
13
Extend Less
Than 1.18 in.
(30 mm)
