moves on the guide pins. Some trapped air is
normal; excess trapped air will dissipate.

3.5.5 Inspect the original pads (See Section 3.3) and they
may be reused if they are in good condition with
sufficient pad thickness.

3.6 TAPPET AND BOOT ASSEMBLY
INSPECTION

3.6.1 In order to inspect the tappet and boot assembly,
remove the pads (12) (See Sections 3.3 or 4.2) and
advance the shear adapter (61) clockwise.
CAUTION: NEVER EXTEND THE TAPPET MORE
THAN 1.75 in. (44.5 mm). See Figure 28. Overextending 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.
3.6.2 I N S P E C T T H E T A P P E T A N D B O O T
A S S E M B L I E S (13) F O R E V I D E N C E O F
DAMAGE, CUTS, CRACKS, TEARS, AND
EVIDENCE OF CORROSION, ETC. Damaged
boots lead to the penetration of dirt and moisture,
and can promote corrosion and impair the operation
of the brake. Replace as necessary (See Section
4.5).

13

Extend LESS THAN
1.75  in. (44.5 mm)

Figure 28 – Permitted Tappet Extension
Where the tappets and boots pass the inspection, retract
the tappets using the shear adapter.

Inspect
Boot

Figure 27 – Guide Pin Boot Inspection (This Image
Does Not Show the Carrier)

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
only expand outwards a small amount due to trapped air.
The boots should normally (due to their ribbed construction)
contract back into place as the tappets move. NOTE: If
the bellows have excess trapped air, then with the tappets
retracted, remove and re-install the actuator to vent the
excess trapped air (See Section 4.4).
Follow the reinstallation steps for the brake pads (See
Section 4.2).
17

SECTION FOUR: MAINTENANCE KITS AND PROCEDURES
Section

4.0
4.1
4.2
4.3

Page

Maintenance Kits . . . . . . . 20-23
Air Disc Brake Shield Kit . . . . .
23
Pad Replacement . . . . . . .
24
Caliper/Carrier/Actuator Assembly . 27-29

Type A

Type B

(Fixed pin)

Section

4.4
Spring or Service Brake . . . . .
4.5 Tappet and Boot Assemblies, and
Tappet Inner Seal . . . . . . .
4.6
Guide Pin and Boot Assemblies . .
4.7
Bendix® Splined Disc® Hub Rotor . .
35

(Wheel turns
toward fixed pin
side of ADB)

44
Pad Retainer Pin

11 Pad Retainer

Page

. 30

32-36
37-42
43-45

18/1 Spring Brake
Actuator
18/2
Service
Actuator

26 Spring Clip
12/2 Pad Holder Spring
(NOTE: Pad Assembly
consists of 12/1 plus 12/2)
45
Washer

Wheel Rotation
(typically left hand)

Wheel Rotation
(typically right hand)

Shield
Kit
(Drive or
Steer)

12/1 Pad
7
Brass
Bushing

40
Caliper
5
Bolt
Guide
Pin

68 Cap

22
Inner Seal

161
Tappet Bushing
13 Tappet
and Boot
Assembly

U-shaped Rotor

10
Cap

39 Caliper Bolt
4 Guide Pin

Actuator
Hardware

37*

61
Shear
Adapter

*37 Adjuster
Caps (2 styles
supplied in kits)

6 Guide Sleeve
Carrier
Mounting
Hardware

1
Caliper
(or Caliper Kit)
9
58 Inner Boot
Ring
Bendix® ADB22X®
Anchor Plate

(Rotor Shield for Trailers)

2A
Bendix®
ADB22X®
Carrier

U-shaped
Rotor
Fasteners

2B
Bendix®
ADB22X®-V
Carrier

SD-1
Drive Hub
SD-2
SD-3

Splined Disc
Rotor (SD)

Splined Disc®
Rotor Hardware
SD-1, -2, -3

See Section 4.2 for exploded view
of electronic wear indicator.

Steer Hub
Figure 29 – Exploded View - Bendix ® ADB22X®, ADB22X® -V , and ADB22X® -LT Air Disc Brakes

18

Bendix
ADB22X-V
Anchor Plate

Carrier
Mounting
Hardware

4.0 MAINTENANCE KITS FOR BENDIX ® ADB22X ®, ADB22X ®-V, AND ADB22X ®-LT AIR
DISC BRAKES
Below is a list of some of the available kits. See Figure 30 for an exploded view showing the components listed.
Kit

Piece Number

Components Included in Kit

K297277

BX277™ Kit (11, 12/1, 12/2, 26, 37, 44, 45, 61) Trailer and Truck

K182236

BA236™ Kit (11, 12/1, 12/2, 26, 37, 44, 45, 61) Standard Service (while supplies last)

Pad Kit (axle set)
In-pad Wear Sensing
Version 1*

K350277

BX277 Kit (11, 12/1, 12/2, 26, 37, 44, 45, 61, 101, 104, 106) Standard Service

Pad Kit (axle set)
In-pad Wear Sensing
Version 2*

K300277

BX277 Kit (11, 12/1, 12/2, 26, 37, 44, 45, 61, 101, 104) Standard Service

Pad Kit (axle set)

K162789

Wear Sensing ECU, 250K Baud Rate, In Pad Wear Sensing, With Velcro

Wear Sensing ECU

K162791

Wear Sensing ECU, 500K Baud Rate, In Pad Wear Sensing, With Velcro

Wear Sensing Wiring Harness

K276551
K163396
K192257
K192258
K193988
K258119
K267636
803151

Wear Sensing ECU, 250K Baud Rate, Continuous Wear Sensing, Trailer
Supply Line 1.5 Meter, In-Pad Wear Sensing Version 1 (103)
Supply Line 1.5 Meter, In-Pad Wear Sensing Version 2 (103)
Supply Line 1.0 Meter, In-Pad Wear Sensing Version 2 (103)
Supply Line 0.75 Meter, In-Pad Wear Sensing Version 2 (103)
Trailer Continuous Wear Sensing Wire Harness Extension (90 in.)
Trailer Continuous Wear Sensing ECU Wire Harness
(26)

Splint Kit (box of 25)
Shear Adapter (box of 10)

802455

Tappet/Boot Kit (wheel end kit)

K092079

Adjuster Cap Kit (box of 10)
Guide Pin, Seal, and Boot Kit
(wheel end kit)

802643

(37)

803114

(4, 5, 6, 7, 9, 10, 37, 39, 40, 58, 61, 68)

II14525

White (5 grams)

Guide Pin Grease

Service Actuators
(See Warning on page 3)

NG-3 Piston-Style
Spring Brake Chambers
(See Warning on page 3)

Double-Diaphragm-Style
Spring Brake Chambers
(See Warning on page 3)

Caliper-Carrier Assembly

Table 2 – Maintenance Kits

Caliper Kit Rationalized
(no carrier)

(61)
(13, 22, 161)

K021964

White (500 grams)

K028039

Bendix® Type 14 Universal (9, 18/2)

K028226

Bendix® Type 16 Universal (9, 18/2)

K028022

Bendix® Type 18 Universal (9, 18/2)

K028225

Bendix® Type 20 Universal (9, 18/2)

K028238

Bendix® Type 22 Universal (9, 18/2)

K028252

Bendix® Type 24 Universal (9, 18/2)

K027557

Bendix® Type 18/16 Piston Style Truck/Trailer Universal (1, 18/1)

K025670

Bendix® Type 18/24 Piston Style Truck/Trailer Universal (1, 18/1)

K025669

Bendix® Type 20/24 Piston Style Truck/Trailer Universal (1, 18/1)

K042457

Bendix® Type 16/24 Double-Diaphragm-Style (35)

K132352

Bendix® Type 18/24 Double-Diaphragm-Style (35)

K041960

Bendix® Type 20/24 Double-Diaphragm-Style (35)

K043148

Bendix® Type 22/24 Double-Diaphragm-Style (35)

K043270

Bendix® Type 24/24 Double Diaphragm-Style (35)

K097850SC

Bendix® ADB22X® 12° Steer and Drive Axial “A” (2A, 1)

K097851SC

ADB22X 12° Steer and Drive Axial “B” (2A, 1)

K149714SC

ADB22X®-LT 0° Trailer Axial "A" [Caliper kit (1)]

K149715SC

ADB22X-LT 0° Trailer Axial "B" [Caliper kit (1)]

K097846SC

ADB22X 12° Steer and Drive Vertical “A” (2B, 1)

K097847SC

ADB22X 12° Steer and Drive Vertical “B” (2B, 1)

K133901SC

ADB22X-LT 12° “A” Brake (No Chamber)

K133902SC

ADB22X-LT 12° “B” Brake (No Chamber)

K258520SC

ADB22X-LT 0° Trailer “A” (Continuous Wear Sensing)

K258525SC

ADB22X-LT 0° Trailer “B” (Continuous Wear Sensing)

K097844SC

ADB22X 12° Steer and Drive Axle “A” (1)

K097845SC

ADB22X 12° Steer and Drive Axle “B” (1)

K098272SC

ADB22X 0° Trailer Axle “A” (1)

K098273SC

ADB22X 0° Trailer Axle “B” (1)

K133909SC

ADB22X-LT 12° “A” Brake with Guide Pins

K133910SC

ADB22X-LT 12° “B” Brake with Guide Pins

19

Kit

Carrier Kit

Hubs

Bendix® Splined Disc®
Rotor Attaching Kit

Piece Number
K051853

Steer and Drive Axle, Axial (2A, 9, 10, 20, 39, 40, 58, 61, 68)

K043288

Trailer Axle, Axial (2A, 9, 10, 20, 39, 40, 58, 61, 68)

K056559

Steer and Drive Axle, Vertical (2B, 9, 10, 20, 39, 40, 58, 61, 68)

K133912

ADB22X-LT 12° Single Beam

K020514

Splined Disc Brake - Aluminum - FF Steer, Standard Bearing Package* (Steer Hub)

803138

Splined Disc Brake - Aluminum - FL Steer, Standard Bearing Package* (Steer Hub)

K045298

Shields

Air Disc Brake Pad Wear Kit

Splined Disc - Aluminum - "TN" Trailer, Standard Bearing Package*

U-shaped - Iron/Aluminum, LMS/Standard Bearing Packages
See hub supplier
for these standard
Flat - Iron/Aluminum, LMS/Standard Bearing Packages
hub products
K037767
802062

Rotors

Components Included in Kit

All Splined Disc® Rotor Applications (SD-1, SD-2, SD-3)
Heavy-Duty 136mm U-shaped Rotor

K038573

Heavy-Duty 138mm U-shaped Rotor and Fasteners

K038574

Heavy-Duty 150mm U-shaped Rotor and Fasteners