Meritor EX+ LS Air Disc Brake

Quick Facts

  • Manufacturer: Meritor, a Cummins company
  • Product Model: EX+™ LS
  • Product Type: Lightweight pneumatic air disc brake
  • Brake Category: Foundation brake
  • Brake Design: Floating caliper with a single-piston actuation system
  • Caliper Construction: Monoblock caliper
  • Primary Applications: Line-haul trucks and commercial trailers
  • Common Positions: Tractor and trailer axles, depending on configuration
  • Brake Size Family: EX225-series commercial air disc brake
  • Friction Material: N-type reduced-copper-compliant brake pads
  • Adjustment: Internal automatic adjustment
  • Optional Equipment: Positive Pad Retraction, electronic pad-wear warning, and pad-and-rotor shields
  • Identification Feature: Model part numbers generally contain an “S” designation
  • Primary Benefit: Combines reduced weight with even pad loading and controlled taper wear

Overview

The Meritor EX+ LS is a lightweight, single-piston air disc brake designed for line-haul trucks and commercial trailers. It provides the braking consistency and fade resistance associated with air disc brakes while reducing wheel-end weight.

The EX+ LS uses a large-diameter piston combined with an integrated pusher plate. This design distributes force across the brake pad and helps control uneven or tapered pad wear.

The piston diameter is approximately twice the size of those used in leading competing single-piston brakes, according to Cummins-Meritor. The larger contact area helps stabilize the pad as it clamps the rotor.

The brake’s internal adjuster is based on the established Meritor EX+ air disc brake architecture. Optional equipment can add positive pad retraction, electronic wear warnings, and protection from road contamination.

Key Characteristics

  • Lightweight air disc brake
  • Single-piston actuation
  • Monoblock caliper construction
  • Large-diameter piston
  • Integrated piston and pusher plate
  • Even distribution of braking force
  • Designed to control tapered pad wear
  • Internal automatic adjustment
  • Line-haul truck applications
  • Commercial trailer applications
  • N-type reduced-copper-compliant friction
  • Visual pad-wear indication
  • Optional Positive Pad Retraction
  • Optional electronic pad-wear warning
  • Optional pad-and-rotor shields
  • Common service principles with other Meritor EX+ brakes

Major Components

  • Monoblock brake caliper
  • Brake carrier
  • Single large-diameter piston
  • Integrated pusher plate
  • Operating lever
  • Actuation shaft
  • Roller or bearing mechanism
  • Internal automatic adjuster
  • Adjuster plug
  • Inboard brake pad
  • Outboard brake pad
  • Brake-pad backing plates
  • Pad-retaining bar
  • Pad-retainer bolt
  • Pad wear indicator
  • Ventilated brake rotor
  • Long guide pin
  • Short guide pin
  • Guide-pin bushings
  • Guide-pin caps
  • Sealing boots
  • Air-brake chamber
  • Combination spring-brake actuator where equipped
  • Torque plate
  • Caliper-to-carrier fasteners
  • Optional Positive Pad Retraction components
  • Optional electronic wear sensor
  • Optional pad-and-rotor shields

How the Brake Component or System Works

When the driver applies the brake pedal, compressed air enters the service chamber attached to the EX+ LS caliper. The air pressure moves the chamber diaphragm and pushrod.

The pushrod acts on the internal operating mechanism. This mechanical system multiplies the input force and transfers it to the large-diameter piston and integrated pusher plate.

The piston and pusher plate move the inboard brake pad against the rotor. The reaction force causes the floating caliper to slide on its guide pins, pulling the outboard pad against the opposite side of the rotor.

Both pads clamp the rotor. Friction converts vehicle motion into heat, slowing the rotating wheel. The ventilated rotor and surrounding airflow help dissipate the heat.

When air pressure is released, the operating mechanism relaxes and removes the clamping force. The internal adjuster maintains the required running clearance as the pads and rotor wear.

When equipped with optional Positive Pad Retraction, the brake actively helps maintain clearance between the friction surfaces after release. This can reduce pad drag, unnecessary wear, and energy loss.

Position and Function Within the Brake System

The EX+ LS is installed at the wheel end and serves as the vehicle’s foundation brake. It creates the physical friction required to slow or stop the vehicle.

The braking sequence includes:

  • The compressor produces compressed air.
  • The air dryer removes moisture and contaminants.
  • The reservoirs store the compressed air.
  • The driver operates the foot brake valve.
  • Relay valves and ABS modulators regulate air delivery.
  • The brake chamber converts air pressure into pushrod movement.
  • The EX+ LS converts pushrod movement into rotor-clamping force.
  • The tires transfer the braking force to the road.

Trailer installations receive the service-brake control signal and air supply through the tractor-to-trailer connections. The trailer relay valve or ABS modulator delivers air to the individual brake chambers.

Common Specifications

  • Brake Type: Pneumatically actuated air disc brake
  • Caliper Design: Floating monoblock caliper
  • Piston Design: Single large-diameter piston
  • Brake Family: EX225-series
  • Primary Applications: Line-haul tractors and commercial trailers
  • Actuator Type: Service chamber or combination spring-brake actuator
  • Brake Pads: Application-approved N-type friction
  • Rotor Type: Ventilated commercial-vehicle disc-brake rotor
  • Adjustment: Internal automatic adjuster
  • Mounting: Caliper and carrier mounted to an axle torque plate
  • Caliper-to-Carrier Fastener: M20×2.5 in applicable configurations
  • Caliper-to-Carrier Torque: 350–400 lb-ft in applicable configurations
  • Wear Inspection: Visual indicator or optional electronic warning
  • Optional Features: Positive Pad Retraction, electronic wear warning, and protective shields

Exact chamber size, rotor, torque plate, mounting hardware, brake-pad compound, fastener torque, and wheel clearance depend on the axle and vehicle configuration.

Operating Specifications and Performance

The EX+ LS was engineered to provide lightweight air-disc-brake performance for line-haul and trailer applications.

Its large-diameter piston and integrated pusher plate distribute the actuator force across the brake pad. This helps stabilize the pad and reduce tapered wear.

Brake performance depends on:

  • Available air pressure
  • Correct chamber size
  • Proper pushrod installation
  • Free caliper movement
  • Guide-pin condition
  • Internal adjuster operation
  • Pad friction material
  • Remaining pad thickness
  • Rotor thickness and condition
  • Axle loading
  • Tire traction
  • ABS operation
  • Stability-system operation

The EX+ LS was validated to meet taper-wear criteria associated with twin-piston brake designs while retaining a single-piston architecture.

Braking Performance and System Integration

The EX+ LS produces the wheel-end braking force commanded by the vehicle’s pneumatic and electronic brake-control systems.

Air disc brakes generally provide stable braking performance during repeated applications because the exposed rotor can dissipate heat effectively. They are also less affected by the thermal expansion that contributes to fade in drum brakes.

The EX+ LS may operate with:

  • Dual-circuit tractor air brakes
  • Trailer air-brake systems
  • Tractor ABS
  • Trailer ABS
  • Automatic traction control
  • Electronic stability control
  • Trailer roll-stability systems
  • Collision-mitigation systems
  • Adaptive cruise braking
  • Electronic pad-wear monitoring

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

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

Air Supply, Controls, and Electronic Integration

The EX+ LS uses a pneumatic brake chamber for normal braking. It does not require electricity to generate foundation-brake force.

Electronic systems can adjust the air pressure delivered to the chamber. These systems may include:

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

Wheel-speed sensors send wheel information to the ABS or stability controller. If the system detects wheel lockup or instability, pneumatic modulators adjust brake-chamber pressure.

An optional electronic pad-wear warning indicator can notify the fleet when the pads reach their replacement point. This can support preventive maintenance and reduce the risk of rotor damage caused by operating with worn pads.

Electronic wear warnings do not replace physical inspection of the pads, rotor, caliper, chamber, guide pins, boots, hoses, and mounting hardware.

Installation, Adjustment, and Brake Balance

The EX+ LS must be installed on an approved torque plate using the correct fasteners, torque specifications, and tightening procedures.

Installation requirements may include:

  • Identifying the exact EX+ LS assembly
  • Confirming left- or right-hand orientation
  • Matching the caliper and carrier
  • Verifying the axle torque plate
  • Using approved mounting fasteners
  • Applying the required fastener torque
  • Installing the correct brake chamber
  • Confirming pushrod engagement
  • Checking rotor alignment
  • Verifying free caliper movement
  • Inspecting guide-pin caps and seals
  • Installing approved brake pads
  • Securing the pad-retaining hardware
  • Checking wheel and valve-stem clearance
  • Testing the brake before road operation

The brake uses an internal automatic adjuster. Technicians should follow Meritor procedures when backing off, checking, or resetting the adjuster. Excessive force or improper tool use can damage the mechanism.

Brake balance must be maintained across the axle. Replacement pads, rotors, chambers, calipers, and carriers must match the vehicle manufacturer’s approved specification.

Foundation Brake, Axle, and Wheel-End Compatibility

The EX+ LS can be used on approved tractor and trailer axles equipped with the appropriate torque plate and wheel-end components.

Compatibility depends on:

  • Axle manufacturer
  • Axle model
  • Torque-plate design
  • Wheel-end configuration
  • Rotor dimensions
  • Hub design
  • Brake-chamber type
  • Brake-chamber size
  • Caliper orientation
  • Wheel size
  • Wheel offset
  • Valve-stem location
  • Suspension clearance
  • ABS sensor arrangement
  • Tire and wheel capacity

The EX+ LS uses a different single-piston monoblock design than the twin-piston EX+ L and EX+ H brakes. Calipers, carriers, and internal components should not be assumed interchangeable.

Common Applications

  • Line-haul tractors
  • Regional-haul tractors
  • Day cab tractors
  • Sleeper tractors
  • Dry van trailers
  • Refrigerated trailers
  • Flatbed trailers
  • Tank trailers
  • Container chassis
  • Curtain-side trailers
  • Hopper trailers
  • Commercial trailer fleets
  • Weight-sensitive tractor configurations
  • Weight-sensitive trailer configurations
  • Pickup-and-delivery applications
  • Vehicles equipped with tractor and trailer air disc brakes

Vehicle and Brake-System Compatibility

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

Compatibility should be confirmed using:

  • Vehicle identification number
  • Tractor or trailer manufacturer
  • Model and model year
  • Axle manufacturer
  • Axle model
  • Meritor brake model
  • Complete brake part number
  • Caliper part number
  • Carrier part number
  • Left- or right-hand position
  • Chamber type and size
  • Rotor part number
  • Brake-pad specification
  • Wheel size and offset
  • Valve-stem arrangement
  • ABS configuration
  • Optional equipment

A replacement brake should not be selected solely by its appearance. The model designation and complete part number must be verified.

Advantages

  • Lightweight brake construction
  • Single-piston design
  • Large piston contact area
  • Integrated piston and pusher plate
  • Even distribution of braking force
  • Controlled taper wear
  • Internal automatic adjustment
  • Consistent braking response
  • Strong fade resistance
  • Simplified pad inspection
  • Reduced number of actuation components
  • N-type reduced-copper friction
  • Optional Positive Pad Retraction
  • Optional electronic pad-wear warning
  • Optional contamination shields
  • Line-haul and trailer applications
  • Commonality with the Meritor EX+ brake family

Limitations or Considerations

  • Primarily intended for line-haul and trailer applications
  • Not automatically suitable for severe-duty vocational service
  • Requires an approved axle and torque plate
  • Must use the correct chamber size
  • Single-piston components differ from twin-piston EX+ brakes
  • Replacement parts must match the EX+ LS
  • Guide pins and seals require inspection
  • Road contamination can affect exposed components
  • Improper mounting can restrict caliper movement
  • Incorrect pads can alter braking performance
  • Rotor service may require wheel-end disassembly
  • Electronic wear warning is optional
  • Positive Pad Retraction is optional
  • Weight savings vary by configuration
  • The brake does not increase certified vehicle ratings

Driver and Operator Experience

Drivers may notice consistent brake response during repeated stops and highway operation. Properly maintained air disc brakes can provide predictable braking with limited fade.

Operators should report:

  • Vehicle pulling during braking
  • Increased stopping distance
  • ABS warning lights
  • Grinding or scraping noises
  • 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
  • Repeated stability-system intervention

A brake may reach its inspection or replacement limit without creating an obvious driving symptom. Scheduled physical inspections remain essential.

Maintenance and Ownership Notes

  • Inspect the air chamber and connections.
  • Check brake-pad thickness.
  • Inspect both inboard and outboard pads.
  • Check the visual pad-wear indicator.
  • Monitor the electronic warning system when equipped.
  • Inspect rotor thickness and condition.
  • Look for rotor cracks and heat damage.
  • Verify free caliper movement.
  • Inspect the long and short guide pins.
  • Check guide-pin caps.
  • Inspect sealing boots.
  • Check the adjuster plug.
  • Inspect pad-retaining hardware.
  • Check caliper and carrier fasteners.
  • Inspect the axle torque plate.
  • Check air hoses and fittings.
  • Verify wheel and valve-stem clearance.
  • Inspect optional protective shields.
  • Replace friction components across the axle.
  • Follow Cummins-Meritor service procedures.

Common Brake-System Problems

Uneven or tapered pad wear: Restricted caliper movement, damaged guide pins, worn bushings, rotor misalignment, incorrect mounting, or problems with the piston and pusher system may be responsible.

Brake dragging: Possible causes include:

  • Restricted caliper movement
  • Damaged guide pins
  • Internal adjuster problems
  • Incorrect chamber installation
  • Improper running clearance
  • Contaminated components
  • Parking-brake release problems
  • Damaged Positive Pad Retraction components

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

Excessive stopping distance: Possible causes include:

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

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

Brake noise: Loose pad-retaining hardware, pad movement, rotor damage, contamination, worn guide components, incorrect friction, or wheel-end problems may produce squealing, rattling, scraping, or grinding.

Rotor cracking: Possible causes include:

  • Excessive heat
  • Severe braking cycles
  • Prolonged brake application
  • Brake drag
  • Worn pads
  • Thermal stress
  • Operation beyond service limits

Adjuster malfunction: Internal contamination, mechanical damage, improper manual adjustment, excessive component wear, or a missing adjuster plug may affect the adjustment mechanism.

Premature pad wear: Brake drag, unsuitable friction material, unbalanced braking, damaged guide components, severe duty cycles, rotor damage, 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 EX+ LS:

  • 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 equipment with properly rated stands.
  • Wear appropriate personal protective equipment.
  • Follow Cummins-Meritor and vehicle manufacturer instructions.

Do not clean the brake 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.

Use the exact fasteners and torque specifications required for the particular caliper, carrier, torque plate, rotor, and axle.

Identification Information

The EX+ LS can be identified through the label on top of the caliper or on the rear inboard face below the air-chamber mounting surface.

Record the following:

  • EX+ LS model designation
  • Complete Meritor part number
  • Serial or production information
  • Caliper part number
  • Carrier part number
  • Left- or right-hand orientation
  • Tractor or trailer application
  • Axle manufacturer
  • Axle model
  • Brake-chamber type
  • Brake-chamber size
  • Brake-pad part number
  • Rotor part number
  • Optional Positive Pad Retraction
  • Electronic wear-sensor equipment
  • Shield configuration
  • Vehicle identification number
  • Trailer serial number

EX+ LS part numbers generally use an “S” within the model designation, such as an EX225S configuration. EX+ L and EX+ H models use different identifying letters and twin-piston designs.

Buying Considerations

  • Confirm the EX+ LS model designation.
  • Record the complete Meritor part number.
  • Verify line-haul tractor or trailer application.
  • Determine left- or right-hand orientation.
  • Match the caliper and carrier.
  • Verify the axle torque plate.
  • Match the brake-chamber type.
  • Confirm the chamber size.
  • Verify rotor dimensions.
  • Select approved N-type friction.
  • Confirm Positive Pad Retraction equipment.
  • Check for an electronic wear sensor.
  • Confirm shield requirements.
  • 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.
  • Determine whether a core charge applies.
  • Verify warranty coverage.
  • Replace axle-matched friction components.

Variants and Configurations

  • Line-haul tractor configurations
  • Commercial trailer configurations
  • Left-hand brake assemblies
  • Right-hand brake assemblies
  • Service-brake chambers
  • Combination spring-brake actuators
  • Different chamber sizes
  • Different axle torque plates
  • Different rotor configurations
  • N-type reduced-copper brake pads
  • Standard pad retraction
  • Optional Positive Pad Retraction
  • Optional electronic pad-wear warning
  • Optional pad-and-rotor shields
  • New caliper assemblies
  • Remanufactured calipers
  • Complete caliper-and-carrier assemblies
  • Application-specific mounting hardware

Comparison to Similar Equipment

Compared with the Bendix ADB22X-LT Air Disc Brake, the Meritor EX+ LS uses a single large-diameter piston and integrated pusher plate. Both are lightweight air disc brakes intended for approved tractor and trailer applications.

Compared with the Bendix ADB22X Air Disc Brake, the EX+ LS uses Meritor’s single-piston monoblock architecture and application-specific Meritor mounting and service components.

Compared with the Meritor EX+ L and EX+ H brakes, the EX+ LS uses a single piston. The other EX+ configurations use twin-piston designs and may serve different application requirements.

Compared with an S-cam drum brake, the EX+ LS offers simplified pad inspection, effective rotor cooling, internal automatic adjustment, and strong fade resistance. Drum brakes may provide a lower initial purchase cost.

Best Fit For

  • Vehicles originally equipped with the Meritor EX+ LS
  • Line-haul tractors
  • Regional-haul tractors
  • Commercial trailers
  • Dry van fleets
  • Refrigerated fleets
  • Flatbed fleets
  • Tank-trailer fleets
  • Weight-sensitive applications
  • Fleets seeking a single-piston air disc brake
  • Operations concerned with tapered pad wear
  • Fleets seeking reduced-copper friction
  • Vehicles equipped with ABS
  • Vehicles equipped with stability systems
  • Fleets wanting optional pad-retraction technology
  • Fleets wanting electronic wear warnings

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 approved brake configuration.

Brake service must not interfere with:

  • Required stopping performance
  • Brake balance
  • Parking-brake operation
  • Emergency braking
  • ABS operation
  • Tractor or trailer stability systems
  • Wheel and valve-stem clearance
  • Axle weight ratings
  • Vehicle weight ratings
  • Required inspection limits

The use of the EX+ LS does not automatically increase the vehicle’s certified payload, axle, or gross vehicle weight ratings.

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

Real World Operating Notes

The EX+ LS can be identified from other EX+ models by its single-piston monoblock caliper and the “S” within its model number. This distinction is important when ordering calipers, carriers, adjuster components, and service kits.

A visual check of the outboard pad is not enough. Technicians should inspect both pads because restricted caliper movement can cause the inboard and outboard pads to wear at different rates.

A wheel end running hotter than the opposite side may have brake drag, restricted guide pins, adjuster problems, parking-brake release issues, or wheel-bearing trouble.

Optional Positive Pad Retraction may reduce pad drag, but it does not eliminate the need to inspect caliper movement and running clearance.

Replacing worn pads without correcting damaged guide pins, boots, seals, adjuster components, or rotor problems can result in repeated premature wear.

Frequently Asked Questions

What is the Meritor EX+ LS?

The EX+ LS is a lightweight, single-piston air disc brake designed primarily for line-haul trucks and commercial trailers.

What does LS identify?

The LS designation identifies the lightweight single-piston version within the Meritor EX+ brake family.

How can it be distinguished from other EX+ brakes?

The EX+ LS uses a single-piston monoblock caliper. Its model number generally contains an “S,” while EX+ L and EX+ H models use different letters and twin-piston designs.

Why does it use a large piston?

The large-diameter piston and integrated pusher plate distribute braking force across the pad. This helps stabilize the pad and control tapered wear.

Does the EX+ LS use a slack adjuster?

No. It uses an internal automatic adjustment mechanism.

What is Positive Pad Retraction?

Positive Pad Retraction is optional equipment designed to maintain running clearance between the pads and rotor after brake release. It may help reduce pad drag and extend friction life.

Does the brake include electronic wear monitoring?

An electronic pad-wear warning indicator is available as optional equipment. Not every EX+ LS installation includes it.

Is the EX+ LS suitable for vocational trucks?

It is primarily designed for line-haul and trailer applications. Vocational use requires approval for the exact axle, vehicle, load, and duty cycle.

Why are the pads wearing unevenly?

Possible causes include restricted caliper movement, damaged guide pins, worn bushings, rotor misalignment, adjuster problems, brake drag, or incorrect installation.

Can EX+ LS components be mixed with EX+ L components?

Components should not be assumed interchangeable. The EX+ LS uses a single-piston monoblock design, while EX+ L and EX+ H brakes use twin-piston designs.

How can the correct replacement assembly be identified?

Use the complete Meritor part number, caliper label, axle information, chamber size, rotor specification, optional equipment, and vehicle VIN or trailer serial number.

Availability and Where to Find

Meritor EX+ LS brakes and service components may be available through Cummins-Meritor distributors, commercial-truck dealerships, trailer dealers, fleet-maintenance providers, brake specialists, and heavy-duty parts suppliers.

Available components may include:

  • Complete caliper-and-carrier assemblies
  • Service calipers
  • Remanufactured calipers
  • N-type brake-pad kits
  • Ventilated rotors
  • Guide-pin kits
  • Guide-pin caps
  • Adjuster components
  • Pad-retaining hardware
  • Service brake chambers
  • Combination spring-brake actuators
  • Positive Pad Retraction components
  • Electronic wear sensors
  • Pad-and-rotor shields
  • Mounting hardware

Before ordering, confirm the EX+ LS designation, complete part number, tractor or trailer application, left- or right-hand orientation, axle, torque plate, chamber size, rotor, friction package, and optional equipment.

Current product information is available through the Cummins-Meritor EX+ LS Air Disc Brake page. Parts and technical resources are also available through Meritor Parts Xpress.

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