Bendix ADB22X Air Disc Brake

Quick Facts

  • Manufacturer: Bendix Commercial Vehicle Systems
  • Product Model: ADB22X®
  • Product Type: Pneumatically operated air disc brake
  • Brake Category: Foundation brake
  • Brake Design: Floating-caliper disc brake
  • Primary Wheel Size: Commercial vehicles using 22.5-inch wheel equipment
  • Common Positions: Steer, drive, and trailer axles
  • Mounting Style: Axial-mount torque plate
  • Related Configuration: Bendix ADB22X-V vertical-mount air disc brake
  • Actuator Options: Service chamber or combination spring-brake actuator
  • Friction Components: Replaceable brake pads and ventilated rotor
  • Maximum Brake Torque: Up to approximately 24 kNm in applicable configurations
  • Optional Technology: Electronic brake-pad wear sensing
  • Primary Applications: Heavy-duty trucks, tractors, buses, and commercial trailers
  • Primary Benefit: Consistent braking performance with reduced fade and simplified pad inspection

Overview

The Bendix ADB22X is a heavy-duty air disc brake designed for steer, drive, and trailer axles on commercial vehicles. It converts pneumatic pressure from the vehicle’s air-brake system into mechanical clamping force at the wheel end.

The brake uses a floating-caliper design. When the driver applies the brakes, an air chamber moves an internal operating mechanism that presses the brake pads against both sides of the rotor. Friction between the pads and rotor slows or stops the vehicle.

Unlike an S-cam drum brake, the ADB22X does not use brake shoes, an S-camshaft, or a conventional automatic slack adjuster. Its internal adjustment mechanism compensates for normal pad and rotor wear.

The ADB22X can be used with a service-only air chamber or a combination service and spring-brake actuator. Optional wear-sensing equipment may also be used to help fleets monitor brake-pad condition.

Key Characteristics

  • Heavy-duty air disc brake
  • Floating-caliper design
  • Designed for 22.5-inch wheel applications
  • Available for steer, drive, and trailer axles
  • Axial-mount caliper and carrier arrangement
  • Pneumatic actuation
  • Internal automatic adjustment
  • Dual-tappet pad application
  • Replaceable brake pads
  • Ventilated brake rotor
  • Service or combination spring-brake actuator options
  • Optional electronic pad-wear sensing
  • Consistent performance during repeated brake applications
  • Reduced brake fade compared with many drum-brake systems
  • Visual pad-wear inspection capability
  • Common service components across multiple Bendix air disc brake applications

Major Components

  • Brake caliper
  • Brake carrier
  • Torque plate or anchor plate
  • Ventilated brake rotor
  • Inboard brake pad
  • Outboard brake pad
  • Brake-pad backing plates
  • Pad-retaining bar
  • Pad-retaining spring
  • Air-brake chamber
  • Actuator pushrod
  • Operating lever
  • Eccentric bearing
  • Internal bridge
  • Threaded tappets
  • Tappet boots
  • Automatic adjuster
  • Adjuster cap
  • Guide pins
  • Guide-pin bushings
  • Guide-pin boots
  • Caliper sealing components
  • Mounting fasteners
  • Optional wear sensor
  • Optional continuous wear-sensing equipment

How the Brake Component or System Works

When the driver presses the brake pedal, the foot brake valve directs compressed air through the service-brake system to the brake chamber mounted on the ADB22X.

Air pressure moves the chamber diaphragm and pushrod. The pushrod acts on the brake’s internal operating lever. The lever and eccentric-bearing mechanism multiply the input force and transfer it through the bridge to the two threaded tappets.

The tappets push the inboard brake pad against the rotor. The resulting reaction force causes the floating caliper to move along its guide pins, pulling the outboard pad into contact with the opposite side of the rotor.

Both pads clamp the rotor, converting vehicle motion into heat through friction. The rotor and surrounding airflow dissipate this heat.

When the driver releases the brake pedal, air pressure leaves the service chamber. The operating mechanism relaxes, and the brake releases enough clamping force to create normal running clearance between the pads and rotor.

The internal adjuster monitors movement within the brake mechanism. As the pads and rotor wear, the adjuster maintains the operating clearance needed for consistent brake response.

Position and Function Within the Brake System

The ADB22X is mounted at the wheel end and serves as the foundation brake. It creates the physical friction that slows the rotating wheel.

The braking sequence involves several components:

  • The air compressor supplies compressed air.
  • The air dryer removes moisture and contaminants.
  • Reservoirs store the compressed air.
  • The foot brake valve responds to driver pedal input.
  • Relay valves and ABS modulators control air delivery.
  • The brake chamber converts air pressure into pushrod movement.
  • The ADB22X converts pushrod movement into rotor-clamping force.
  • The tires transfer braking force to the road.

On drive or trailer axles, the brake may use a combination spring-brake actuator. The service side provides normal braking, while the spring-brake side provides parking and emergency brake functions.

Common Specifications

  • Brake Type: Pneumatically operated air disc brake
  • Caliper Design: Floating caliper
  • Application: Steer, drive, and trailer axles
  • Wheel Equipment: Primarily 22.5-inch commercial-vehicle wheels
  • Mounting Design: Axial mounting to an axle torque plate
  • Actuation: Air-brake chamber
  • Service Actuator: Application-specific chamber size
  • Parking Actuator: Combination spring-brake chamber where required
  • Brake Pads: Application-approved Bendix friction material
  • Rotor Type: Ventilated disc-brake rotor
  • Adjustment: Internal automatic adjustment
  • Brake Torque: Up to approximately 24 kNm in applicable configurations
  • Wear Monitoring: Mechanical indicators or optional electronic sensing
  • ABS Compatibility: Compatible with approved commercial-vehicle ABS systems
  • Stability-System Compatibility: Compatible with properly configured electronic stability systems

Exact caliper orientation, actuator size, torque-plate design, brake-pad specification, rotor dimensions, fasteners, and wheel clearances must be confirmed for the individual vehicle and axle.

Operating Specifications and Performance

The ADB22X is designed to provide stable braking performance across a wide range of commercial-vehicle operating conditions.

Its open rotor and pad design supports effective heat dissipation. This can help reduce the loss of braking effectiveness associated with repeated or prolonged brake applications.

Brake performance depends on:

  • Air pressure delivered to the actuator
  • Brake-chamber size
  • Pushrod adjustment and installation
  • Caliper movement
  • Guide-pin condition
  • Internal adjuster operation
  • Brake-pad friction material
  • Remaining pad thickness
  • Rotor thickness and condition
  • Axle loading
  • Tire condition
  • ABS and stability-system operation

The brake’s mechanical capacity does not override the vehicle’s axle, tire, wheel, suspension, or certified weight ratings.

Braking Performance and System Integration

The ADB22X provides the wheel-end braking force commanded by the vehicle’s pneumatic and electronic brake controls.

Air disc brakes generally provide consistent braking response because the pads clamp an exposed rotor rather than expanding against the inside of a drum. The design is less susceptible to brake fade caused by drum expansion.

The ADB22X may operate as part of a system containing:

  • Dual-circuit air brakes
  • Antilock braking
  • Automatic traction control
  • Electronic stability control
  • Collision-mitigation braking
  • Adaptive cruise control
  • Trailer ABS
  • Electronic pad-wear monitoring

Proper brake balance requires compatible foundation brakes across each axle. Pad friction, actuator size, rotor dimensions, valve timing, and electronic programming must remain consistent with the vehicle manufacturer’s design.

Brake pads should normally be serviced across both wheel ends of the same axle to preserve balanced friction performance.

Air Supply, Controls, and Electronic Integration

The ADB22X is mechanically operated by a pneumatic brake chamber. It does not require electricity to produce normal braking force.

The brake may work with electronically controlled systems that regulate air pressure, including:

  • Antilock braking systems
  • Automatic traction control
  • Electronic stability control
  • Collision-mitigation systems
  • Adaptive cruise braking
  • Trailer stability systems

Wheel-speed sensors report wheel behavior to the ABS or stability controller. If wheel lockup or instability is detected, the electronic controller commands pneumatic modulators to adjust the air pressure delivered to the brake chambers.

Optional Bendix wear-sensing technology may provide electronic information about brake-pad condition. Depending on the system, this may include an end-of-life alert or continuous estimates of remaining pad life.

Electronic monitoring supplements physical inspection. It does not eliminate the need to inspect pads, rotors, calipers, chambers, guide pins, boots, hoses, and mounting hardware.

Installation, Adjustment, and Brake Balance

The ADB22X caliper and carrier must be installed on the correct torque plate using approved fasteners, washers, torque specifications, and tightening sequences.

Installation requirements may include:

  • Confirming the correct left- or right-hand brake
  • Matching the caliper and carrier
  • Using the correct mounting hardware
  • Following the required torque sequence
  • Installing the approved brake chamber
  • Verifying actuator pushrod engagement
  • Checking rotor alignment
  • Confirming free caliper movement
  • Inspecting guide-pin boots
  • Installing approved pads and retaining hardware
  • Checking wheel and valve-stem clearance
  • Testing brake operation before road use

Improper caliper mounting can prevent the assembly from sliding freely. This may leave the pads in contact with the rotor and cause rapid wear, overheating, pulling, or reduced fuel efficiency.

The ADB22X includes an internal automatic adjuster. Normal running clearance should not be altered through unapproved external adjustment methods.

After installation, the brake should be applied and released several times according to the service procedure. The technician should then confirm correct running clearance, wheel rotation, chamber operation, and system leakage.

Foundation Brake, Axle, and Wheel-End Compatibility

The ADB22X can be installed on approved steer, drive, and trailer axles equipped with the correct torque plate and wheel-end components.

Compatibility depends on:

  • Axle manufacturer and model
  • Torque-plate design
  • Axial mounting arrangement
  • Left- or right-hand orientation
  • Rotor dimensions
  • Hub design
  • Wheel offset
  • Wheel size
  • Valve-stem location
  • Brake-chamber size
  • Suspension clearance
  • Tire and wheel capacity
  • ABS sensor arrangement

Not every wheel or valve stem is compatible with the ADB22X. An incorrect wheel or valve-stem arrangement may create interference and could damage the valve stem.

The ADB22X and ADB22X-LT use different caliper and carrier designs. Their individual calipers and carriers must not be mixed. Replacement parts must match the complete brake model and application.

Common Applications

  • Class 8 highway tractors
  • Regional-haul tractors
  • Day cab tractors
  • Sleeper tractors
  • Heavy-duty straight trucks
  • Vocational trucks
  • Dump trucks
  • Concrete mixers
  • Refuse trucks
  • Tank trucks
  • Heavy-haul tractors
  • Transit buses
  • Motor coaches
  • School buses
  • Dry van trailers
  • Refrigerated trailers
  • Tank trailers
  • Flatbed trailers
  • Specialized commercial trailers
  • Vehicles equipped with advanced driver-assistance systems

Vehicle and Brake-System Compatibility

The ADB22X must match the vehicle’s axle, torque plate, hub, rotor, actuator, wheel, and electronic brake-system configuration.

Compatibility should be confirmed using:

  • Vehicle identification number
  • Vehicle manufacturer
  • Model and model year
  • Axle manufacturer
  • Axle model
  • Bendix brake model
  • Caliper and carrier part number
  • Left- or right-hand position
  • Axial or vertical mounting
  • Brake-chamber type and size
  • Rotor part number
  • Pad specification
  • Wheel size and offset
  • Valve-stem design
  • ABS configuration
  • Wear-sensor equipment

A replacement caliper should not be selected solely by appearance. Similar-looking ADB22X, ADB22X-V, and ADB22X-LT components may not be interchangeable.

Advantages

  • Consistent braking response
  • Strong resistance to brake fade
  • Effective heat dissipation
  • Floating-caliper design
  • Internal automatic adjustment
  • Simplified pad inspection
  • Faster pad replacement than many drum-brake designs
  • No conventional slack adjuster
  • No S-camshaft
  • No brake shoes or return springs
  • Reduced number of foundation-brake components
  • Steer, drive, and trailer axle applications
  • Service and spring-brake actuator options
  • Compatibility with ABS and stability systems
  • Optional electronic pad-wear monitoring
  • Common replacement wear components across multiple Bendix applications

Limitations or Considerations

  • Higher initial cost than many drum-brake systems
  • Requires compatible wheels and valve stems
  • Requires correct torque-plate mounting
  • Caliper and carrier variants must not be mixed
  • Rotor replacement may require hub or wheel-end disassembly
  • Guide pins and boots require inspection
  • Road contamination can affect exposed components
  • Incorrect pad selection can alter braking performance
  • Improper mounting can cause brake drag
  • Seized caliper movement can produce uneven wear
  • Actuator specifications must match the application
  • Special service procedures and tools may be required
  • Replacement parts must match the exact brake configuration

Driver and Operator Experience

Drivers may notice a responsive and consistent pedal feel from a properly maintained ADB22X system. Air disc brakes can also maintain more predictable performance during repeated stops and demanding downhill operation.

Operators should report:

  • Vehicle pulling during braking
  • Longer stopping distances
  • Brake warning lights
  • Grinding or scraping noises
  • Repeated ABS activation
  • Burning odors
  • Smoke near a wheel end
  • Excessive heat at one wheel
  • Parking brakes that do not hold
  • Parking brakes that release slowly
  • Visible rotor damage
  • Uneven pad wear

The absence of a noticeable driving symptom does not confirm that the brakes are within their wear limits. Regular physical inspection remains necessary.

Maintenance and Ownership Notes

  • Inspect brake-pad thickness regularly.
  • Inspect both inboard and outboard pads.
  • Check rotor thickness and condition.
  • Look for rotor cracks and heat damage.
  • Inspect caliper movement.
  • Check guide-pin boots.
  • Inspect tappet boots.
  • Check pad-retaining hardware.
  • Inspect the brake chamber.
  • Check the air hose and fitting.
  • Verify that the adjuster cap is installed correctly.
  • Inspect mounting bolts and torque plate.
  • Check the hub and wheel bearings.
  • Confirm wheel and valve-stem clearance.
  • Monitor electronic wear sensors when equipped.
  • Replace axle-matched friction components.
  • Use approved Bendix replacement pads.
  • Follow the vehicle and brake manufacturer’s service intervals.

Common Brake-System Problems

Uneven brake-pad wear: Restricted caliper movement, damaged guide pins, worn bushings, a seized tappet, incorrect mounting, rotor misalignment, or contaminated friction components may be responsible.

Brake dragging: Possible causes include:

  • Restricted caliper movement
  • Improper chamber installation
  • Incorrect running clearance
  • Internal adjuster problems
  • Damaged guide pins
  • Binding operating mechanism
  • Incorrect mounting-bolt torque
  • Parking-brake actuator problems

Brake will not apply: Low air pressure, a damaged chamber, disconnected pushrod, internal mechanism failure, blocked air hose, or control-system problem may prevent application.

Excessive stopping distance: Possible causes include:

  • Worn brake pads
  • Incorrect friction material
  • Contaminated pads
  • Damaged rotors
  • Low actuator pressure
  • Air-system leakage
  • Incorrect chamber size
  • Brake imbalance
  • Tire-traction problems

Brake noise: Pad movement, worn retaining hardware, rotor damage, contamination, incorrect friction material, loose mounting components, or wheel-end problems may create squealing, rattling, scraping, or grinding noises.

Rotor cracking: Excessive heat, prolonged brake application, insufficient cooling, severe duty cycles, worn pads, dragging brakes, or thermal stress may damage the rotor.

Excessive wheel-end heat: Possible causes include:

  • Dragging brake pads
  • Seized caliper movement
  • Parking-brake release problems
  • Incorrect actuator installation
  • Wheel-bearing problems
  • Repeated severe braking
  • Improper running clearance

Adjuster will not operate correctly: Internal contamination, mechanical damage, improper manual adjustment, worn components, or operation beyond the approved wear limits may affect the adjuster.

Premature pad wear: Incorrect friction material, brake drag, unbalanced braking, severe duty cycles, caliper restriction, rotor damage, or improper installation may shorten pad life.

Safety and Service Precautions

Commercial brake work exposes technicians to heavy components, stored air pressure, spring-brake forces, and potentially hazardous brake dust.

Before servicing the ADB22X:

  • Park the vehicle on a level surface.
  • Apply the parking brakes.
  • Block the wheels.
  • Shut down the engine.
  • Remove the ignition key.
  • Drain the applicable air reservoirs.
  • Cage or release spring brakes according to approved procedures.
  • Support raised vehicles with properly rated stands.
  • Wear appropriate personal protective equipment.
  • Follow Bendix and vehicle manufacturer instructions.

Do not use compressed air or dry brushing to clean brake assemblies. These methods can create airborne brake dust. Use approved wet-cleaning or filtered-vacuum procedures.

Spring-brake actuators contain powerful mechanical springs. Do not disassemble a sealed spring-brake chamber.

Brake pads, calipers, carriers, mounting hardware, rotors, wheels, and valve stems must be compatible with the exact application. Improvised component substitutions can create unsafe braking conditions.

Identification Information

The identification label is generally located near the guide-pin housing on the caliper assembly.

Record the following:

  • Bendix brake model
  • Bendix part number
  • Serial number
  • Customer part number
  • Caliper part number
  • Carrier part number
  • Left- or right-hand orientation
  • Axial or vertical mounting
  • Axle manufacturer
  • Axle model
  • Brake-chamber size
  • Service-only or spring-brake actuator
  • Brake-pad part number
  • Rotor part number
  • Wear-sensor configuration
  • Vehicle identification number

Visual differences in the carrier and pad area can help distinguish the ADB22X from the ADB22X-LT, but the identification label and part numbers should provide the final confirmation.

Buying Considerations

  • Confirm the exact Bendix brake model.
  • Record the caliper and carrier part numbers.
  • Determine left- or right-hand orientation.
  • Verify axial or vertical mounting.
  • Match the axle torque plate.
  • Match the brake-chamber size.
  • Confirm service or combination spring-brake operation.
  • Verify rotor dimensions.
  • Select approved Bendix brake pads.
  • Confirm the wear-sensor configuration.
  • Check wheel and valve-stem compatibility.
  • Determine whether the caliper is new or remanufactured.
  • Check whether the carrier is included.
  • Check whether mounting hardware is included.
  • Verify whether a core charge applies.
  • Compare warranty coverage.
  • Purchase axle-matched friction components.
  • Confirm that replacement parts maintain the original vehicle specification.

Variants and Configurations

  • ADB22X axial-mount brake
  • ADB22X-V vertical-mount brake
  • ADB22X-LT lightweight brake
  • Steer-axle configurations
  • Drive-axle configurations
  • Trailer-axle configurations
  • Left-hand assemblies
  • Right-hand assemblies
  • Service-brake actuators
  • Combination spring-brake actuators
  • Different chamber sizes
  • Different torque-plate designs
  • Different rotor configurations
  • Optional wear sensors
  • Optional continuous wear monitoring
  • New caliper and carrier assemblies
  • Remanufactured calipers
  • Application-specific brake-pad compounds

Comparison to Similar Equipment

Compared with the Bendix ADB22X-LT, the standard ADB22X is designed for a broader range of heavy-duty applications. The LT model reduces wheel-end weight and is suited to approved line-haul and lighter-duty configurations.

Compared with the Bendix ADB22X-V, the ADB22X uses an axial mounting arrangement. The ADB22X-V uses a vertical mounting design with fasteners installed at a different angle relative to the axle.

Compared with an S-cam drum brake, the ADB22X provides more exposed friction surfaces, improved heat dissipation, simplified pad inspection, and stronger resistance to brake fade. Drum brakes may have a lower initial cost and remain common in heavy-duty fleets.

Compared with a hydraulic disc brake, the ADB22X uses compressed air and a commercial air-brake chamber rather than hydraulic fluid and a hydraulic caliper piston.

Best Fit For

  • Vehicles originally equipped with the Bendix ADB22X
  • Class 8 highway tractors
  • Regional-haul tractors
  • Heavy-duty vocational trucks
  • Commercial buses
  • Steer-axle applications
  • Drive-axle applications
  • Trailer-axle applications
  • Fleets seeking consistent braking performance
  • Vehicles operating on demanding routes
  • Vehicles equipped with collision-mitigation systems
  • Vehicles equipped with electronic stability control
  • Fleets wanting simplified pad inspection
  • Applications requiring strong fade resistance
  • Operators maintaining standardized Bendix wheel-end components

Related Vehicle and Trailer Types

Related Truck and Trailer Models

Related Brake System Types

Related Brake Products

Related Equipment Systems

Related Guides

Regulatory and Compliance Notes

Commercial-vehicle foundation brakes must satisfy applicable federal, state, provincial, and local requirements. In the United States, vehicle manufacturers certify applicable braking systems under Federal Motor Vehicle Safety Standard No. 121.

Replacement pads, rotors, chambers, calipers, carriers, and mounting components must preserve the vehicle’s approved braking performance.

Brake service must not interfere with:

  • Required stopping performance
  • Brake balance
  • Parking-brake performance
  • Emergency braking
  • ABS operation
  • Electronic stability control
  • Wheel and tire clearance
  • Required inspection limits
  • Axle and vehicle weight ratings

Commercial vehicle inspectors may examine pad thickness, rotor condition, brake adjustment, chamber mounting, air hoses, air leakage, and other wheel-end components.

A brake with missing, loose, contaminated, cracked, excessively worn, or improperly installed components may place the vehicle out of service.

Real World Operating Notes

The outboard brake pad may be easy to see, but technicians should inspect both pads. Restricted caliper movement can cause one pad to wear more rapidly than the other.

A wheel end that runs hotter than the opposite side may have a dragging brake, restricted caliper, parking-brake release problem, or wheel-bearing issue. Temperature differences should be investigated rather than attributed automatically to normal operation.

Replacing only the pads may not correct uneven wear. The guide pins, bushings, tappets, adjuster, chamber, torque plate, and rotor should also be inspected.

Approved friction material is important. A pad that physically fits the carrier may still have different friction, temperature, backing-plate, or structural characteristics.

ADB22X and ADB22X-LT calipers and carriers must not be mixed. A mismatched assembly can create incorrect component clearances and unsafe brake operation.

Frequently Asked Questions

What is the Bendix ADB22X?

The ADB22X is a pneumatically operated floating-caliper air disc brake used on commercial-truck, tractor, bus, and trailer axles.

How does the ADB22X apply the brakes?

Compressed air moves the brake-chamber pushrod. The brake’s operating mechanism transfers and multiplies that force, causing both pads to clamp the rotor.

Can it be used on steer, drive, and trailer axles?

Yes. Application-specific ADB22X configurations are available for approved steer, drive, and trailer axles.

Does the ADB22X use a slack adjuster?

No. It uses an internal automatic adjustment mechanism rather than a conventional external slack adjuster.

Can the ADB22X provide parking-brake operation?

Yes. Drive and trailer applications may use an approved combination spring-brake actuator.

What is the difference between ADB22X and ADB22X-V?

The primary difference is the mounting arrangement. The ADB22X uses axial mounting, while the ADB22X-V uses a vertical mounting design.

What is the difference between ADB22X and ADB22X-LT?

The ADB22X-LT is a lighter-weight configuration designed for approved tractor and trailer applications. Calipers and carriers from the two models must not be mixed.

Are all brake pads that fit the carrier acceptable?

No. Use brake pads approved for the exact Bendix brake and application. A physically similar pad may have unsuitable friction, backing-plate, or temperature characteristics.

Why are the pads wearing unevenly?

Common causes include restricted caliper movement, damaged guide pins, worn bushings, seized tappets, rotor misalignment, incorrect mounting, or a dragging actuator.

Can the rotor be reused during a pad replacement?

Only if it remains within Bendix and vehicle manufacturer specifications for thickness, cracking, surface condition, and wear.

Does electronic wear sensing replace physical inspection?

No. Wear sensing can assist maintenance planning, but technicians must still inspect the pads, rotor, caliper, boots, chamber, hoses, and mounting components.

How can the correct replacement brake be identified?

Use the identification label, Bendix part number, caliper and carrier numbers, axle information, mounting style, brake-chamber size, and vehicle VIN.

Availability and Where to Find

Bendix ADB22X brakes and service components may be available through Bendix distributors, commercial-truck dealerships, trailer dealers, heavy-duty brake specialists, fleet-maintenance providers, and commercial-vehicle parts suppliers.

Available components may include:

  • Complete caliper and carrier assemblies
  • Service-new calipers
  • Remanufactured calipers
  • Brake-pad kits
  • Ventilated rotors
  • Guide-pin kits
  • Tappet and boot kits
  • Adjuster components
  • Pad-retaining hardware
  • Brake chambers
  • Spring-brake actuators
  • Wear sensors
  • Mounting hardware

Before ordering, confirm the complete brake model, part number, left- or right-hand orientation, axial or vertical mounting, axle application, chamber size, rotor design, and wear-sensor configuration.

Current product information, technical documentation, replacement parts, and distributor resources are available through the Bendix ADB22X Air Disc Brake page and Bendix Services and Support.

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