Haldex ModulT Air Disc Brake

Quick Facts

  • Manufacturer: Haldex
  • Product Family: ModulT
  • Product Type: Pneumatically operated air disc brake
  • Brake Category: Foundation brake
  • Brake Design: Floating monoblock caliper
  • Actuation Design: Wide single-tappet mechanism
  • Primary Applications: Commercial trucks, buses, and trailers
  • Available Wheel Sizes: Application-specific designs for 17.5-, 19.5-, and 22.5-inch wheels
  • North American Application: Primarily 22.5-inch commercial trailer applications
  • Common Model: DBT22LT
  • Adjustment: Integrated automatic adjustment
  • Slide System: Two sealed stainless-steel slide pins
  • Pad Retention: Boltless brake-pad retainer
  • Optional Equipment: Pad Wear Indicator and Pad Wear Sensor
  • Primary Benefit: Combines low weight, efficient braking, simplified maintenance, and controlled pad wear

Overview

The Haldex ModulT is a lightweight commercial-vehicle air disc brake platform developed for trucks, buses, and trailers. Its compact modular design emphasizes braking efficiency, durability, reduced weight, and simplified maintenance.

The system uses a floating monoblock caliper, a wide single-tappet mechanism, and two sealed slide pins. Although it uses one tappet instead of two, its T-shaped thrust plate distributes force across the brake pad in a manner similar to a twin-tappet design.

The ModulT’s wide single-piston mechanism provides even pad loading while reducing the number of internal components. Double roller bearings within the operating mechanism help reduce hysteresis and transfer brake-chamber force efficiently.

Haldex introduced a 22.5-inch ModulT trailer brake to the United States with an approximate weight of 70 pounds, including the brake pads. The broader global family also includes configurations for 17.5- and 19.5-inch wheels.

Key Characteristics

  • Lightweight air disc brake
  • Floating monoblock caliper
  • Wide single-tappet mechanism
  • T-shaped thrust plate
  • Force distribution similar to a twin-tappet design
  • Two sealed stainless-steel slide pins
  • PTFE-coated steel bushings
  • Composite slide-pin bushings
  • Lubrication-free sliding function
  • Sealed-for-life slide-pin system
  • Integrated automatic adjustment
  • Low-hysteresis operating mechanism
  • Double roller bearings
  • Inward-folded mechanism bellows
  • Boltless brake-pad retainer
  • Only two primary brake-unit fastening bolts
  • Optional Pad Wear Indicator
  • Optional Pad Wear Sensor
  • Truck, bus, and trailer applications

Major Components

  • Monoblock brake caliper
  • Brake carrier
  • Wide single tappet
  • T-shaped thrust plate
  • Operating lever
  • Double roller bearings
  • Integrated automatic adjuster
  • Reset shaft
  • Adjuster plug
  • Inboard brake pad
  • Outboard brake pad
  • Brake-pad springs
  • Boltless pad retainer
  • Spring bracket
  • Ventilated brake disc
  • Long slide pin
  • Short slide pin
  • Stainless-steel slide pins
  • PTFE-coated steel bushing
  • Composite bushing
  • Slide-pin screws
  • Slide-pin caps
  • Mechanism bellows
  • Caliper sealing components
  • Air-brake chamber
  • Combination spring-brake actuator where equipped
  • Axle mounting fasteners
  • Optional Pad Wear Indicator
  • Optional Pad Wear Sensor

How the Brake Component or System Works

When the driver applies the service brakes, compressed air enters the brake chamber attached to the ModulT. The air pressure moves the chamber diaphragm and pushrod.

The pushrod acts on the brake’s internal operating lever. Double roller bearings within the mechanism help transfer this movement with low mechanical resistance.

The operating mechanism moves the wide single tappet and T-shaped thrust plate. The thrust plate distributes force across the inboard brake pad and pushes it against the disc.

The reaction force causes the floating caliper to move laterally along its two slide pins. This movement brings the outboard brake pad into contact with the opposite side of the disc.

Both pads clamp the rotating disc. Friction converts vehicle movement into heat, slowing the wheel. The exposed disc and surrounding airflow help dissipate this heat.

When the driver releases the brakes, the air chamber releases its force and the pads move away from the disc. The integrated automatic adjuster compensates for normal pad wear and maintains the required running clearance.

Position and Function Within the Brake System

The ModulT is mounted at the wheel end and serves as the vehicle’s foundation brake. It creates the friction that slows or stops the wheel.

The complete braking process involves several components:

  • The air compressor produces compressed air.
  • The air dryer removes moisture and contaminants.
  • Reservoirs store the compressed air.
  • The brake-control valve responds to driver input.
  • Relay valves and ABS modulators regulate air delivery.
  • The brake chamber converts air pressure into pushrod movement.
  • The ModulT converts pushrod movement into disc-clamping force.
  • The tires transfer braking force to the roadway.

When the disc brake also provides parking-brake operation, a combination spring-brake actuator applies mechanical force through the same caliper mechanism.

Common Specifications

  • Brake Type: Pneumatically actuated air disc brake
  • Caliper Design: Floating monoblock caliper
  • Actuation: Wide single-tappet mechanism
  • Slide System: Two environmentally sealed stainless-steel slide pins
  • Slide Lubrication: Lubrication-free and sealed for life
  • Adjustment: Integrated automatic adjustment
  • Pad Retention: Boltless retaining system
  • Wheel Sizes: 17.5, 19.5, or 22.5 inches, depending on model
  • DBT22LT Weight: Slightly more than 30 kilograms, or approximately 70 pounds, including pads and depending on carrier
  • DBT22LT Braking Force: Up to approximately 20 kNm
  • DBT19LT Weight: Approximately 29 kilograms including pads
  • DBT19LT Braking Force: Up to approximately 18 kNm
  • Brake-Chamber Mounting-Nut Torque: 180 ±20 Nm in applicable configurations
  • Slide-Pin Screw Torque: 180 Nm plus 70 degrees in applicable configurations
  • Wear Monitoring: Optional mechanical indicator or electronic sensor

Exact dimensions, braking force, chamber size, disc specification, carrier, mounting hardware, and fastener torque must be confirmed for the particular ModulT model and axle.

Operating Specifications and Performance

The ModulT is designed to provide efficient braking with a low weight-to-braking-force ratio.

The wide tappet and T-shaped thrust plate spread force across the inboard pad. The floating caliper then transfers an equivalent reaction force to the outboard pad.

Brake performance depends on:

  • Air pressure delivered to the chamber
  • Correct brake-chamber size
  • Proper pushrod installation
  • Free caliper movement
  • Slide-pin condition
  • Automatic adjuster operation
  • Approved brake-pad friction
  • Remaining pad thickness
  • Disc thickness and condition
  • Axle loading
  • Tire traction
  • ABS or EBS operation

Low hysteresis helps the brake respond efficiently to pressure changes. Hysteresis is the difference between the force applied to the mechanism and the braking response produced at the friction surfaces.

Braking Performance and System Integration

The ModulT produces the wheel-end friction commanded by the vehicle’s pneumatic and electronic control systems.

Air disc brakes generally maintain consistent braking performance during repeated stops because the exposed disc dissipates heat efficiently. They are less affected by the thermal expansion that contributes to fade in many drum brakes.

The ModulT may operate with:

  • Dual-circuit truck air brakes
  • Trailer air-brake systems
  • Antilock braking systems
  • Electronic braking systems
  • Automatic traction control
  • Tractor stability control
  • Trailer roll-stability systems
  • Electronic pad-wear monitoring

Correct brake balance requires compatible brakes, friction material, actuator sizes, discs, and control-system settings across the axle.

Pads should normally be serviced at both wheel ends of the same axle to preserve balanced braking.

Air Supply, Controls, and Electronic Integration

The ModulT uses a pneumatic brake chamber to generate normal braking force. Basic brake operation does not require a direct electrical connection.

ABS or electronic braking systems may regulate the pressure delivered to the chamber. These systems use wheel-speed information and pneumatic modulators to control brake force.

Electronic systems associated with ModulT-equipped vehicles may include:

  • Truck ABS
  • Trailer ABS
  • Electronic braking systems
  • Automatic traction control
  • Electronic stability control
  • Trailer roll-stability control
  • Pad-wear monitoring

An optional Pad Wear Indicator provides a warning when the friction material reaches its designated wear point. An optional Pad Wear Sensor may provide electrical information that reduces the time needed for manual pad inspections.

Electronic wear monitoring supplements physical inspection. It does not replace inspection of the pads, disc, caliper, chamber, bellows, slide pins, hoses, and mounting hardware.

Installation, Adjustment, and Brake Balance

The ModulT must be installed on an approved axle using the correct carrier, chamber, mounting hardware, and tightening procedures.

Installation requirements may include:

  • Confirming the exact ModulT model
  • Identifying Generation I or Generation II
  • Determining left- or right-hand orientation
  • Matching the caliper and carrier
  • Confirming the axle mounting interface
  • Using approved mounting fasteners
  • Following the axle manufacturer’s torque requirements
  • Installing the correct brake chamber
  • Confirming pushrod engagement
  • Checking disc alignment
  • Verifying free caliper movement
  • Inspecting the mechanism bellows
  • Installing approved brake pads
  • Securing the boltless pad retainer
  • Checking wheel and valve-stem clearance
  • Performing a brake function test

The integrated adjuster compensates for normal brake-pad wear. Technicians should follow Haldex procedures when resetting or checking the adjustment mechanism.

Brake balance must be preserved across the axle. Pad friction, chamber size, disc dimensions, and caliper configuration should match the original vehicle specification.

Foundation Brake, Axle, and Wheel-End Compatibility

The ModulT family includes application-specific brakes for trucks, buses, semi-trailers, and drawbar trailers.

Compatibility depends on:

  • Vehicle type
  • Axle manufacturer
  • Axle model
  • Carrier design
  • Axle mounting interface
  • Brake model
  • Brake generation
  • Left- or right-hand position
  • Disc dimensions
  • Hub design
  • Brake-chamber type
  • Brake-chamber size
  • Wheel diameter
  • Wheel offset
  • Valve-stem location
  • Suspension clearance
  • ABS or EBS configuration

The 22.5-inch DBT22LT is a common trailer configuration. The wider ModulT family also includes brakes for 17.5- and 19.5-inch wheel applications.

Components should not be assumed interchangeable between different sizes, generations, carriers, or axle manufacturers.

Common Applications

  • Line-haul trailers
  • Dry van trailers
  • Refrigerated trailers
  • Flatbed trailers
  • Tank trailers
  • Curtain-side trailers
  • Container chassis
  • Hopper trailers
  • Semi-trailers
  • Drawbar trailers
  • Commercial trucks
  • Delivery trucks
  • Transit buses
  • Motor coaches
  • Weight-sensitive equipment
  • Vehicles using ABS or electronic braking systems

Vehicle and Brake-System Compatibility

The ModulT must match the vehicle’s axle, carrier, disc, hub, actuator, wheel, and electronic brake-system configuration.

Compatibility should be confirmed using:

  • Vehicle identification number
  • Trailer serial number
  • Truck, bus, or trailer manufacturer
  • Model and model year
  • Axle manufacturer
  • Axle model
  • ModulT brake model
  • Generation I or Generation II
  • Complete brake part number
  • Carrier part number
  • Left- or right-hand orientation
  • Chamber type and size
  • Disc part number
  • Brake-pad specification
  • Wheel size and offset
  • ABS or EBS configuration
  • Wear-monitoring equipment

A replacement brake should not be selected solely by appearance. Similar ModulT configurations may use different carriers, pads, mounting points, or service components.

Advantages

  • Low brake assembly weight
  • High braking force for its weight
  • Compact modular construction
  • Floating monoblock caliper
  • Wide single-tappet mechanism
  • Even brake-pad force distribution
  • Low-hysteresis operation
  • Two sealed stainless-steel slide pins
  • Lubrication-free slide function
  • Protected inward-folded mechanism bellows
  • Integrated automatic adjustment
  • Boltless brake-pad retainer
  • Simplified pad replacement
  • Fewer primary brake components
  • Truck, bus, and trailer applications
  • Optional pad-wear monitoring

Limitations or Considerations

  • Requires exact model identification
  • Generation I and Generation II components may differ
  • Different axle manufacturers use different carriers
  • Components vary between wheel sizes
  • Requires approved brake pads and discs
  • Slide pins and sealing components require inspection
  • Road contamination can affect exposed components
  • Improper installation can restrict caliper movement
  • Incorrect chamber selection can alter braking performance
  • Disc service may require wheel-end disassembly
  • Wear-monitoring equipment is optional
  • Not every configuration is offered in every market
  • Requires technicians familiar with air disc brakes
  • Does not increase certified axle or vehicle ratings

Driver and Operator Experience

Drivers may notice consistent pedal response and reduced fade during repeated braking. Properly maintained air disc brakes can provide predictable performance across a wide range of temperatures.

Operators should report:

  • Vehicle pulling during braking
  • Increased stopping distance
  • ABS or EBS warning lights
  • Grinding or scraping noises
  • Burning odors
  • Smoke near a wheel end
  • Excessive wheel-end heat
  • Parking brakes that fail to hold
  • Parking brakes that release slowly
  • Visible disc damage
  • Uneven pad wear
  • Unusual brake vibration

A lack of obvious symptoms does not confirm that the pads and discs remain within their wear limits.

Maintenance and Ownership Notes

  • Inspect both brake pads.
  • Check the pad-wear indicator.
  • Monitor the Pad Wear Sensor when equipped.
  • Measure remaining friction material.
  • Inspect the brake disc.
  • Check for disc cracks and heat damage.
  • Verify free caliper movement.
  • Inspect both slide pins.
  • Check slide-pin caps.
  • Inspect the mechanism bellows.
  • Check caliper sealing components.
  • Inspect the adjuster plug.
  • Test the automatic adjuster.
  • Inspect the pad retainer.
  • Check pad springs and brackets.
  • Inspect the brake chamber.
  • Check air hoses and fittings.
  • Inspect the carrier and mounting fasteners.
  • Verify wheel and valve-stem clearance.
  • Replace friction components across the axle.
  • Follow the Haldex maintenance schedule.

Common Brake-System Problems

Uneven brake-pad wear: Restricted caliper movement, damaged slide pins, worn bushings, a damaged thrust plate, disc misalignment, or improper mounting may be responsible.

Brake dragging: Possible causes include:

  • Restricted slide-pin movement
  • Automatic adjuster problems
  • Incorrect chamber installation
  • Improper running clearance
  • Damaged internal mechanism
  • Parking-brake release problems
  • Contaminated brake components

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

Excessive stopping distance: Possible causes include:

  • Worn brake pads
  • Incorrect friction material
  • Contaminated pads
  • Damaged brake discs
  • Low chamber pressure
  • Incorrect actuator size
  • Air-system leakage
  • Brake imbalance
  • Poor tire traction

Excessive wheel-end heat: Dragging pads, restricted caliper movement, parking-brake release problems, wheel-bearing trouble, incorrect actuator installation, or repeated severe braking may be responsible.

Brake noise: Loose pad-retaining components, pad movement, disc damage, contamination, worn slide parts, or wheel-end problems may cause squealing, rattling, scraping, or grinding.

Disc cracking: Possible causes include:

  • Excessive brake temperature
  • Severe braking cycles
  • Prolonged brake application
  • Dragging pads
  • Worn friction material
  • Thermal stress
  • Operation beyond service limits

Automatic adjuster malfunction: Internal contamination, mechanical damage, improper resetting, excessive wear, or a damaged adjuster seal may interfere with normal adjustment.

Premature pad wear: Brake drag, incorrect friction material, unbalanced braking, severe operation, damaged slide components, disc problems, or improper installation may shorten pad life.

Safety and Service Precautions

Air disc brake service exposes technicians to stored air pressure, spring-brake forces, heavy wheel-end components, and potentially hazardous brake dust.

Before servicing the ModulT:

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

Do not clean brake assemblies using compressed air or dry brushing. Use approved wet-cleaning or filtered-vacuum procedures to reduce airborne brake dust.

Never disassemble a sealed spring-brake actuator. Its internal power spring can cause severe injury.

The ModulT should only be serviced by trained commercial-vehicle technicians using the correct procedures, tools, components, and torque specifications.

Identification Information

The brake model and configuration may be identified through labels, stamped information, casting marks, axle records, and vehicle build information.

Record the following:

  • Haldex ModulT designation
  • Complete brake model
  • DBT model number
  • Generation I or Generation II
  • Complete Haldex part number
  • Caliper part number
  • Carrier part number
  • Left- or right-hand orientation
  • Axle manufacturer
  • Axle model
  • Brake-chamber type
  • Brake-chamber size
  • Brake-pad kit number
  • Brake-disc part number
  • Pad Wear Indicator
  • Pad Wear Sensor
  • Vehicle identification number
  • Trailer serial number

The complete part number should be used when ordering components. Appearance alone may not distinguish every model, generation, and axle-specific configuration.

Buying Considerations

  • Confirm the complete ModulT model.
  • Identify the wheel size.
  • Determine Generation I or Generation II.
  • Record the complete Haldex part number.
  • Verify truck, bus, or trailer application.
  • Determine left- or right-hand orientation.
  • Match the caliper and carrier.
  • Confirm the axle manufacturer.
  • Verify the axle mounting interface.
  • Match the brake-chamber type.
  • Confirm the brake-chamber size.
  • Verify the brake-disc specification.
  • Select the approved brake-pad kit.
  • Check wear-monitoring equipment.
  • Determine whether the carrier is included.
  • Check whether mounting hardware is included.
  • Compare new and remanufactured options.
  • Verify warranty coverage.
  • Replace axle-matched friction components.

Variants and Configurations

  • ModulT DBT22LT
  • ModulT DBT19LT
  • 17.5-inch wheel configurations
  • 19.5-inch wheel configurations
  • 22.5-inch wheel configurations
  • Generation I brakes
  • Generation II brakes
  • Truck applications
  • Bus applications
  • Trailer applications
  • Semi-trailer configurations
  • Drawbar-trailer configurations
  • Left-hand assemblies
  • Right-hand assemblies
  • Service-brake chambers
  • Combination spring-brake actuators
  • Different axle-specific carriers
  • Pad Wear Indicator
  • Pad Wear Sensor
  • Application-specific brake-pad kits

Comparison to Similar Equipment

Compared with the Meritor EX+ LS Air Disc Brake, the Haldex ModulT uses a wide single-tappet mechanism, a boltless pad retainer, and a sealed lubrication-free slide system. Both emphasize reduced weight and single-actuation efficiency.

Compared with the Bendix ADB22X-LT Air Disc Brake, the ModulT uses a different caliper, tappet, slide-pin, carrier, pad-retention, and adjustment architecture. Parts should not be considered interchangeable.

Compared with the Bendix ADB22X Air Disc Brake, the ModulT emphasizes a compact modular design with a single wide tappet and only two primary brake-unit fasteners.

Compared with an S-cam drum brake, the ModulT offers simplified pad inspection, effective disc cooling, internal automatic adjustment, and resistance to fade. Drum brakes may have a lower initial cost and greater familiarity among some service facilities.

Best Fit For

  • Vehicles originally equipped with Haldex ModulT brakes
  • Commercial trailers
  • Line-haul fleets
  • Dry van fleets
  • Refrigerated fleets
  • Flatbed fleets
  • Tank-trailer fleets
  • Weight-sensitive equipment
  • Applications requiring 22.5-inch trailer brakes
  • Approved truck and bus applications
  • Fleets seeking simplified pad replacement
  • Operations wanting a lubrication-free slide system
  • Fleets wanting optional wear monitoring
  • Applications requiring strong fade resistance
  • Fleets standardizing Haldex brake 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 meet applicable federal, state, provincial, and local requirements. In the United States, applicable vehicle and trailer braking systems are certified under Federal Motor Vehicle Safety Standard No. 121.

Replacement pads, discs, chambers, calipers, carriers, and mounting components must preserve the vehicle’s approved brake configuration.

Brake service must not interfere with:

  • Required stopping performance
  • Axle-to-axle brake balance
  • Parking-brake operation
  • Emergency braking
  • ABS or EBS operation
  • Stability-system operation
  • Wheel and valve-stem clearance
  • Axle weight ratings
  • Vehicle weight ratings
  • Required inspection limits

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

Real World Operating Notes

The ModulT is available in several sizes, generations, and axle-specific configurations. The exact brake model should be confirmed before ordering pads, carriers, slide components, or complete brake assemblies.

Generation I and Generation II DBT22LT brakes may look different while providing similar operational performance. Their service parts should still be verified using the exact part number.

The outboard pad may be visible during a wheel-on inspection, but both pads require inspection. Restricted caliper movement can cause one pad to wear faster than the other.

The slide-pin system is designed to operate without routine grease servicing. Introducing unapproved lubricants can damage sealing materials or attract contamination.

A clicking sound from the internal torque limiter can sometimes occur after new pads are installed. This does not automatically indicate a defect, but brake operation should be verified according to the Haldex service procedure.

Frequently Asked Questions

What is the Haldex ModulT?

The ModulT is a lightweight floating-caliper air disc brake platform designed for commercial trucks, buses, and trailers.

Is the ModulT a single- or twin-tappet brake?

It uses a wide single-tappet mechanism with a T-shaped thrust plate that distributes force across the brake pad.

What wheel sizes are available?

The broader ModulT family includes application-specific designs for 17.5-, 19.5-, and 22.5-inch wheels.

What is the DBT22LT?

The DBT22LT is a 22.5-inch ModulT brake commonly used in commercial trailer applications.

How much does the DBT22LT weigh?

It weighs slightly more than 30 kilograms, or approximately 70 pounds, including pads and depending on the carrier.

Does the ModulT require slide-pin lubrication?

The slide function is designed as a lubrication-free, sealed-for-life system. Service should follow Haldex instructions.

Does it use a slack adjuster?

No. The brake uses an integrated internal automatic adjustment mechanism.

What is the boltless pad retainer?

It is a retaining design that allows the brake pads to be secured and removed without a conventional retainer bolt, simplifying pad service.

Can the ModulT provide parking-brake operation?

Yes. Approved applications can use a combination spring-brake actuator.

Are wear sensors available?

Yes. Optional Pad Wear Indicator and Pad Wear Sensor configurations are available.

Are Generation I and Generation II parts interchangeable?

Some components may differ. The exact model, generation, axle, carrier, and part number must be checked before ordering parts.

How can the correct replacement brake be identified?

Use the Haldex model and part number, generation, axle manufacturer, carrier, chamber size, wheel size, and vehicle or trailer identification information.

Availability and Where to Find

Haldex ModulT brakes and replacement components may be available through Haldex distributors, commercial-truck dealerships, trailer dealers, axle manufacturers, fleet-maintenance providers, brake specialists, and heavy-duty parts suppliers.

Available components may include:

  • Complete disc-brake units
  • Caliper assemblies
  • Axle-specific carriers
  • Brake-pad kits
  • Ventilated brake discs
  • Slide-pin kits
  • Slide-pin caps
  • Mechanism seals
  • Reset-shaft kits
  • Pad retainers
  • Pad springs
  • Brake chambers
  • Spring-brake actuators
  • Pad Wear Indicators
  • Pad Wear Sensors
  • Mounting hardware

Before ordering, confirm the ModulT model, wheel size, generation, complete part number, left- or right-hand orientation, axle manufacturer, carrier, chamber size, pad kit, disc, and wear-monitoring equipment.

Current product information, service instructions, videos, and application resources are available through the Haldex ModulT Air Disc Brake page and Haldex North American support resources.

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