Instructions for the Bendix® Air Disc Brake Pad and Rotor Gauge Tool

Instructions for the Bendix® Air Disc Brake Pad and Rotor Gauge Tool
Instructions for the Bendix Air Disc Brake
Pad and Rotor Gauge Tool
Be sure to follow the General Safety Guidelines on pages one and two of this document for vehicle preparation.
read pad wear here (either side)
indicator Line
rotor measurement
temporary rotor measurement locks
FIGURE 1 - pad and rotor wear gauge tool
When working on or around a vehicle, the following guidelines should be observed AT All TIMEs:
▲ Park the vehicle on a level surface, apply the
parking brakes and always block the wheels.
Always wear personal protection equipment.
▲ stop the engine and remove the ignition key
when working under or around the vehicle.
When working in the engine compartment,
the engine should be shut off and the ignition
key should be removed. Where circumstances
require that the engine be in operation, EXTREME
cAUTIOn should be used to prevent personal
injury resulting from contact with moving,
rotating, leaking, heated or electrically-charged
▲ Do not attempt to install, remove, disassemble
or assemble a component until you have read,
and thoroughly understand, the recommended
procedures. Use only the proper tools and
observe all precautions pertaining to use of those
▲ If the work is being performed on the vehicle’s
air brake system, or any auxiliary pressurized air
systems, make certain to drain the air pressure
from all reservoirs before beginning AnY work
on the vehicle. If the vehicle is equipped with a
Bendix® AD-Is® air dryer system, a Bendix® DRM™
dryer reservoir module, or a Bendix® AD-9si® air
dryer, be sure to drain the purge reservoir.
▲ F o l l o w i n g t h e v e h i c l e m a n u f a c t u r e r ’s
recommended procedures, deactivate the
electrical system in a manner that safely removes
all electrical power from the vehicle.
▲ never exceed manufacturer’s recommended
▲ never connect or disconnect a hose or line
containing pressure; it may whip and/or cause
hazardous airborne dust and dirt particles. Wear
eye protection. slowly open connections with
care, and verify that no pressure is present. never
remove a component or plug unless you are
certain all system pressure has been depleted.
▲ Use only genuine Bendix ® brand replacement
parts, components and kits. Replacement
hardware, tubing, hose, fittings, wiring, etc. must
be of equivalent size, type and strength as original
equipment and be designed specifically for such
applications and systems.
▲ components with stripped threads or damaged
parts should be replaced rather than repaired.
Do not attempt repairs requiring machining or
welding unless specifically stated and approved
by the vehicle and component manufacturer.
▲ Prior to returning the vehicle to service, make
certain all components and systems are restored
to their proper operating condition.
▲ For vehicles with Automatic Traction control
(ATc), the ATc function must be disabled (ATc
indicator lamp should be On) prior to performing
any vehicle maintenance where one or more
wheels on a drive axle are lifted off the ground
and moving.
▲ The power MUsT be temporarily disconnected
from the radar sensor whenever any tests UsInG
A DYnAMOMETER are conducted on a vehicle
equipped with a Bendix® Wingman® system.
▲ You should consult the vehicle manufacturer's operating and service manuals, and any related literature,
in conjunction with the Guidelines above.
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 the risk of valve stem shear
and other compatibility issues.
DUsT. POssIBlE cAncER AnD lUnG
While Bendix spicer Foundation Brake llc does
not offer asbestos brake linings, the long-term
affects of some non-asbestos fibers have not been
determined. current Occupational safety and health
Administration (OshA) Regulations cover exposure
levels to some components of non-asbestos linings,
but not all. The following precautions must be used
when handling these materials.
▲ Avoid creating dust. compressed air or dry
brushing must never be used for cleaning brake
assemblies or the work area.
▲ Bendix recommends that workers doing brake
work must take steps to minimize exposure
to airborne brake lining particles. Proper
procedures to reduce exposure include working
in a well-ventilated area, segregation of areas
where brake work is done, use of local filtered
ventilation systems or use of enclosed cells with
filtered vacuums. Respirators approved by the
Mine safety and health Administration (MshA)
or national Institute for Occupational safety
and health (nIOsh) should be worn at all times
during brake servicing.
▲ Workers must wash before eating, drinking or
smoking; shower after working, and should not
wear work clothes home. Work clothes should
be vacuumed and laundered separately without
▲ OshA Regulations regarding testing, disposal
of waste and methods of reducing exposure
for asbestos are set forth in 29 code of Federal
Regulations §1910.001. These Regulations
provide valuable information which can be
utilized to reduce exposure to airborne particles.
▲ Material safety Data sheets on this product, as
required by OshA, are available from Bendix.
call 1-800-247-2725 and speak to the Tech Team
or e-mail
Vehicle Applications
This pad and rotor gauge tool can only be used for Bendix®
ADB22X Air Disc Brakes.
Rotor Measurement
See Figure 1. Slide the rotor measurement jaws until the
rotor is held between them. Read the rotor thickness by
the indicator against the gauge. (Use the temporary locks
to hold the measurement, until the pad measurement is
complete.) The gauge shows between 50 mm and 30 mm.
New rotors will show 45 mm, and the replacement point
is 37 mm.
Pad Wear Measurement
See Figure 2.
FIGURE 2 - Insert the Pad and wear gauge
Slide the long arm of the tool into the carrier-caliper
assembly through one of the channels shown in Figure 2
and rest the end of the tool against the back of the brake
pad wear
gauge slides
to contact
the machined
FIGURE 3 - slide the Pad gauge against the machined
surface of the brake
See Figure 3. Slide the (smaller) sliding guide until it rests
against the machined surface of the air brake housing.
Read the remaining pad material measurement. The full
range from 100% to zero is displayed. The two indicators
to show the (a) wheels-off recommended inspection point,
and (b) the Commercial Vehicle Safety Alliance (CVSA)
Out-Of-Service limit. Always replace pads as an axle set.
S-1640 © 2015 Bendix Spicer Foundation Brake LLC. 05/15. All Rights Reserved.
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