Bendix Commercial Vehicle Systems ADB22X-V Air Disc Brakes - Manual (Page 8)

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2.1.3 Rotor Quick Inspection
See Figure 12. See the various potential rotor conditions
that you may fi nd. See the criteria below for whether the
rotor needs to be replaced and/or scheduled for a full
inspection.
2.2 RUNNING CLEARANCE QUICK
INSPECTION
CAUTION: Follow all safe maintenance practices.
On level ground, with the wheels chocked and the parking
brake temporarily released, check for movement of the
brake caliper. This small movement, less than 0.08" (2 mm)
- approximately the thickness of a nickel - in the inboard/
outboard direction indicates that the brake is moving
properly on its guide pins.
If the caliper has no movement or appears to move greater
than the distances noted above, a full wheel-removed
inspection will be necessary (See Section 4.1).
FIGURE 13 - CALIPER RUNNING CLEARANCE
(FIGURE DOES NOT SHOW WHEEL)
FIGURE 12 - EXAMPLES OF ACCEPTABLE AND NON-ACCEPTABLE ROTOR CRACKS AND GROOVES
Push/Pull
By Hand
to Check
the Caliper
Movement
Area
F
Area
H
Area G
f
Area J
Cracks reaching
either edge of the
G
H
rotor
are not
acceptable
for either
type of
rotor
Circumferential
grooves, as in Area
J, are acceptable
if less than 0.06 in.
(1.5 mm) deep.
J
• For standard Bendix rotors, cracks
running in a radial direction — like
spokes of a wheel (see Area H) — less
than
0.06 in. (1.5 mm) deep or wide
are acceptable if they do not reach
either edge (see G). Cracks are only
acceptable if the length of the crack is
less than 75% of dimension “f” (the width
of the rotor contact area).
• For Bendix Splined Disc rotors, radial
cracks are only acceptable if they are
less than
0.04 in. (1.0 mm) deep or
wide and if they do not reach either edge
(see G). Crack lengths must be less
than 75% of dimension “f” (the width
of the rotor contact area).
In addition, follow the
recommendations of the
vehicle manufacturer.
Note: Axles should
have either all Bendix
Splined Disc (or all
conventional) rotors.
Rotor
Friction
Surface
Width “f”
No action is needed
f o r s m a l l c r a c k s
s p r e a d o v e r t h e
surface (e.g. Area F)
F