Ken Tool Bendix ADB22X-V Air Disc Brakes - Manual (Page 15)

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4.5.2 Place a suitable tool (e.g. a large flat-blade
screwdriver) between carrier (2) and caliper (1)
forcing them in opposite directions, and read the
maximum value on the dial-gauge. See Figure 27.
If the value is greater than 0.078 in. (2.0 mm), replace
the guide pin bushings (See Section 5.6) OR replace the
caliper/carrier assembly (See Section 5.3).
Measure the range of travel along the guide pin
bearings:
4.5.3 Remove the Pads (See Section 4.3). Using hand
pressure only (no tools), the caliper (1) should slide
freely along the whole length of the guide pins. This
movement should be at least 0.95 inch (25 mm)
when the pads are not present. If the movement
is less than this amount, replace the caliper/carrier
assembly.
Inspect the guide pin inner boots:
4.5.4 See Figures 28 and 29. With the pads removed,
slide the carrier by hand to the inboard position (See
Figure 28). By looking through the opening where
the pads are installed — and also from below —
inspect the inner boot (9) for each of the guide pins.
INSPECT FOR DAMAGE, CUTS AND CRACKS.
Replace damaged boots immediately to prevent
dirt and/or moisture affecting the movement of the
guide pins (See Section 5.4). Damaged or corroded
guide pins will impair the operation of the brake.
In addition, during installation, the boots are
compressed to minimize the amount of air trapped
within them. Observe as you move the carrier back
towards the outboard position; the boots should not
appear to expand outwards due to trapped air —
this is a sign of damaged boots. The boots should
normally (due to their concertina construction)
contract back into place as the caliper moves on
the guide pins.
Inspect
Boot
FIGURE 28 - GUIDE PIN BOOT INSPECTION (THIS IMAGE DOES
NOT SHOW THE CARRIER)
4.5.5 Inspect the original pads (See Section 4.3) and they
may be reused if they are in good condition with
suffi cient pad thickness.
4.6 TAPPET AND BOOT ASSEMBLY
INSPECTION
4.6.1 In order to inspect the tappet and boot assembly,
remove the pads (12) (See Sections 4.3 or 5.2) and
advance the shear adapter (61) clockwise.
CAUTION: NEVER EXTEND THE TAPPET MORE THAN
1.75 in. (44.5 mm). See Figure 29. Over-extending the
tappet will result in the tappet losing engagement with
the synchronizing mechanism. Since the mechanism
can only be set at the manufacturing plant, the caliper/
carrier assembly must be replaced if this happens.
4.6.2 INSPECT THE TAPPET AND BOOT ASSEMBLIES
(13) FOR EVIDENCE OF DAMAGE, CUTS,
CRACKS, AND EVIDENCE OF CORROSION,
ETC. The penetration of dirt and moisture into
the brake can lead to corrosion and impair the
operation of the brake. When installed, the boots
are compressed to minimize the amount of air
trapped within them. Observe as you move the
tappet back using the shear adapter; the boots
should not appear to expand outwards due to
trapped air — this is a sign of damaged boots.
The boots should normally (due to their concertina
construction) contract back into place as the tappets
move. Damaged boots lead to the penetration of dirt
and moisture, and can lead to corrosion and impair
the operation of the brake. Replace as necessary
(See Section 5.5).
13
Extend LESS THAN
1.75 in. (44.5 mm.)
FIGURE 29 - PERMITTED TAPPET EXTENSION
Where the tappets and boots pass the inspection, retract
the tappets using the shear adapter.
Follow the reinstallation steps for the brake pads (See
Section 5.2).