Meritor Q Plus Cam Brake

Quick Facts

Manufacturer: Meritor, a Cummins company
Product Name: Q Plus Cam Brake
Common Product Marking: Q+
Product Type: Pneumatically operated S-cam drum brake
Brake Category: Heavy-duty foundation brake
Primary Positions: Steer, drive, trailer, and auxiliary axles, depending on configuration
Common Brake Diameter: 16.5 inches on many heavy-duty applications
Common Lining Widths: Application-specific, including several truck and trailer configurations
Actuation: Air brake chamber, slack adjuster, camshaft, and S-cam
Adjustment: Manual or automatic slack adjuster, depending on the installation
Primary Applications: Line-haul trucks, vocational vehicles, buses, trailers, and specialty commercial vehicles
Primary Benefit: Durable and widely supported drum-brake performance for demanding commercial-vehicle applications
Current Brand Ownership: Meritor became part of Cummins in 2022, while Meritor-branded braking products continue to be supported

Overview

The Meritor Q Plus Cam Brake is a heavy-duty S-cam drum brake used on commercial trucks, tractors, trailers, buses, and vocational vehicles. It is one of Meritor’s most widely recognized foundation-brake designs and is commonly identified by the Q+ designation.

The brake uses compressed air to move a brake chamber pushrod. The pushrod rotates a slack adjuster and camshaft, causing the S-cam to spread the brake shoes outward against the inside of the brake drum.

The Q Plus design is available in numerous application-specific configurations. Differences can include brake diameter, lining width, shoe design, camshaft length, chamber size, mounting position, axle application, automatic slack adjuster, and friction material.

Meritor describes the Q+ drum brake as suitable for truck and trailer line-haul and vocational applications. The company emphasizes consistent braking, durability, and broad commercial-vehicle coverage. Meritor brake product information

The Q Plus should not be treated as a single universal brake assembly. Correct replacement parts must be identified using the axle, brake size, spider, camshaft, shoe, lining, slack-adjuster, and vehicle information.

Key Characteristics

Heavy-duty S-cam drum-brake design
Pneumatic foundation-brake operation
Available for truck, tractor, bus, and trailer axles
Suitable for line-haul and vocational applications
Multiple brake sizes and lining widths
Replaceable brake shoes and friction linings
Application-specific friction materials
Camshaft-driven shoe expansion
Compatible with automatic slack adjusters
Compatible with commercial-vehicle ABS
Available for steer, drive, trailer, and auxiliary axles
Durable construction for high-mileage service
Broad aftermarket parts availability
Established commercial-fleet service history
Compatible with different axle and wheel-end arrangements

Major Components

Brake spider
Anchor pins
Brake shoes
Friction linings
Lining rivets
Shoe return springs
Retaining springs
Brake rollers
Roller retainers
Camshaft
S-cam head
Camshaft bushings
Camshaft seals
Camshaft support bracket
Slack adjuster
Air brake chamber
Chamber pushrod
Clevis and clevis pin
Brake drum
Dust shield when equipped
Automatic slack-adjuster brackets
Mounting fasteners
ABS tone ring
Wheel-speed sensor
Wheel hub
Wheel bearings and seals

How the Brake Component or System Works

When the driver applies the service brakes, compressed air enters the service section of the brake chamber. Air pressure moves the chamber diaphragm and pushrod.

The pushrod rotates the slack adjuster, which turns the camshaft. The S-shaped head at the opposite end of the camshaft forces the brake rollers apart.

As the rollers move, they push the brake shoes outward until the friction linings contact the inside surface of the rotating brake drum. Friction converts vehicle movement into heat and slows the wheel.

When the driver releases the brake pedal, air leaves the chamber. Return springs pull the shoes away from the drum, while the chamber and slack-adjuster mechanism return to their released positions.

The slack adjuster maintains the mechanical relationship between chamber stroke and camshaft rotation. An automatic slack adjuster compensates for normal lining and drum wear when the brake system is correctly installed, lubricated, and operating within its designed limits.

Position and Function Within the Brake System

The Q Plus is the foundation brake located at the wheel end. It converts pneumatic pressure and mechanical movement into friction against the brake drum.

The complete braking sequence involves:

The driver applying the brake pedal
The tractor brake valve creating a pneumatic control signal
Relay or ABS valves directing air to the appropriate brake chambers
Brake chambers moving their pushrods
Slack adjusters rotating the camshafts
S-cams spreading the brake shoes
Friction linings contacting the drums
Tires transferring braking force to the road

On drive and trailer axles equipped with spring-brake chambers, the Q Plus brake may also provide parking and emergency-brake functions. When the spring brake applies, mechanical spring force moves the pushrod and activates the same slack-adjuster, camshaft, shoe, and drum assembly.

The Q Plus foundation brake does not independently determine air pressure or prevent wheel lockup. Those functions are controlled by the vehicle’s air valves, ABS, stability system, and driver input.

Common Specifications

Brake Type: Pneumatically operated S-cam drum brake
Product Family: Meritor Q Plus or Q+
Common Brake Diameter: 16.5 inches on many heavy-duty configurations
Brake Width: Application-specific
Foundation-Brake Positions: Steer, drive, trailer, and auxiliary axles
Actuation: Air brake chamber and S-cam mechanism
Adjustment: Automatic or manual slack adjuster, depending on application
Brake Shoes: Replaceable commercial-vehicle brake shoes
Friction Material: Application-specific lining formulation
Brake Drum: Application-specific cast or lightweight commercial brake drum
Camshaft Rotation: Left- or right-hand configuration
Brake Chamber: Service or spring-brake chamber, depending on axle position
ABS Compatibility: Compatible with properly configured commercial-vehicle ABS
Vehicle Applications: Trucks, tractors, buses, trailers, and vocational vehicles
Service Environment: Line-haul, regional, vocational, severe-duty, and specialty applications

Exact dimensions, chamber size, effective slack-adjuster length, camshaft, lining code, shoe geometry, and drum specifications must be confirmed for the individual axle and brake assembly.

Operating Specifications and Performance

Q Plus operating performance depends on the complete brake configuration rather than the brake shoes or camshaft alone. Brake diameter, lining width, chamber size, slack-adjuster length, air pressure, friction material, and drum condition all influence brake torque.

Performance is also affected by:

Gross axle weight
Vehicle speed
Brake temperature
Air-system pressure
Pushrod stroke
Camshaft and bushing condition
Drum diameter
Lining condition
Tire traction
Axle loading
Tractor-to-trailer brake balance
ABS operation

The brake must use the chamber, slack adjuster, friction material, and drum approved for the axle application. Changing one of these components can alter brake torque, timing, balance, and certification.

Drum brakes retain substantial heat after repeated applications. Drivers should use appropriate gearing, engine braking, and safe descent speeds rather than relying entirely on the foundation brakes.

Braking Performance and System Integration

The Q Plus must operate as part of a balanced air-brake system. Brake balance is influenced by the mechanical condition of each wheel end and the timing and pressure delivered by the pneumatic controls.

When all brakes are properly adjusted, the system distributes stopping work across the vehicle’s equipped axles. If one brake has excessive stroke, contaminated linings, weak chamber output, or worn mechanical components, the remaining brakes may perform more of the stopping work.

Brake imbalance can result in:

Vehicle pulling during braking
Uneven lining wear
Excessive drum temperatures
Reduced stopping performance
Wheel lockup
Premature ABS activation
Tractor-to-trailer imbalance
Reduced vehicle stability

All wheel ends on an axle should be inspected when one brake displays abnormal wear, overheating, or reduced performance.

Air Supply, Controls, and Electronic Integration

The Q Plus depends on the vehicle’s compressed-air system. The compressor, air dryer, reservoirs, valves, chambers, hoses, and fittings must provide clean and properly regulated air.

The brake can operate with:

Tractor and truck air-brake systems
Trailer air-brake systems
Service brake chambers
Spring-brake chambers
Relay valves
Quick-release valves
Spring-brake modulating valves
Antilock braking systems
Automatic traction control
Electronic stability control
Trailer roll-stability systems

ABS monitors wheel speed and adjusts air pressure when wheel lockup is detected. It does not mechanically adjust the Q Plus foundation brake or correct worn, contaminated, or damaged components.

Electronic stability systems may selectively apply Q Plus brakes to help control certain loss-of-stability events. Their performance still depends on properly maintained foundation brakes, sensors, valves, tires, and electrical components.

Installation, Adjustment, and Brake Balance

Correct installation requires matching the Q Plus components to the axle, spider, wheel end, and brake certification.

Important installation checks include:

Confirming the correct brake size
Verifying left- and right-hand camshaft rotation
Matching the camshaft length and spline
Inspecting the spider and anchor-pin areas
Installing the correct shoes and friction material
Checking rollers and retainers
Installing return springs correctly
Matching the slack-adjuster length
Setting the chamber pushrod and clevis correctly
Checking chamber mounting position
Lubricating specified points
Measuring applied pushrod stroke
Checking drum diameter and condition
Confirming wheel and drum clearance
Testing brake operation before road service

Automatic slack adjusters should not require repeated manual readjustment. A brake that repeatedly goes out of adjustment may have worn components, incorrect installation, excessive drum diameter, a damaged adjuster, or another underlying defect.

Final brake adjustment and stroke measurements should follow the applicable Meritor service procedure and regulatory limits.

Foundation Brake, Axle, and Wheel-End Compatibility

Q Plus brakes are used with numerous Meritor and other approved commercial-vehicle axles. The brake must match the spider mounting, axle flange, wheel end, camshaft support, drum, and chamber arrangement.

Compatibility depends on:

Axle manufacturer
Axle model
Axle rating
Brake diameter
Lining width
Spider design
Camshaft length
Camshaft spline
Camshaft rotation
Slack-adjuster length
Brake chamber size
Drum dimensions
Hub design
Wheel size
Wheel offset
ABS sensor arrangement
Vehicle brake certification

A brake shoe or camshaft should not be selected solely because it resembles the removed component. Small differences in geometry can affect fit, stroke, lining contact, and braking performance.

Common Applications

Class 7 and Class 8 tractors
Heavy-duty straight trucks
Line-haul trucks
Regional delivery trucks
Dump trucks
Concrete mixers
Refuse trucks
Logging trucks
Construction vehicles
Heavy-haul tractors
Tank trucks
Municipal trucks
School buses
Transit buses
Motorcoaches
Dry van trailers
Refrigerated trailers
Flatbed trailers
Tank trailers
Dump trailers
Hopper trailers
Container chassis
Specialty commercial vehicles

Vehicle and Brake-System Compatibility

The Q Plus is available across a broad range of commercial-vehicle applications, but every brake assembly must be matched to its original or approved replacement specification.

Compatibility should be verified using:

Vehicle identification number
Truck or trailer manufacturer
Vehicle model and model year
Axle identification tag
Gross axle weight rating
Brake model
Brake diameter and width
Brake shoe number
Friction-lining code
Camshaft part number
Slack-adjuster part number
Brake chamber size
Drum part number
Hub and wheel information
ABS configuration

Similar trucks or trailers may have different foundation brakes because of axle ratings, customer specifications, production dates, or duty cycles.

Advantages

Proven heavy-duty drum-brake design
Broad truck and trailer application coverage
Suitable for line-haul and vocational service
Durable mechanical construction
Widely understood service procedures
Broad aftermarket parts availability
Replaceable brake shoes and linings
Multiple friction-material options
Compatible with automatic slack adjusters
Compatible with commercial-vehicle ABS
Available for steer, drive, trailer, and auxiliary axles
Strong parts and technical-support network
Can be rebuilt without replacing the complete wheel-end assembly
Suitable for demanding operating environments
Common fleet familiarity

Limitations or Considerations

Brake drum must be removed for complete friction inspection
Drum and wheel-end components can be heavy
Heat remains enclosed within the drum
Repeated braking can produce brake fade
Water inside the drum may temporarily affect friction
Brake dust accumulates inside the assembly
Camshaft bushings and seals require service
Automatic slack adjusters require inspection and lubrication
Pushrod stroke must be monitored
Brake balance depends on correct adjustment
Different Q Plus configurations are not universally interchangeable
Incorrect lining material can alter braking performance
Oversized drums can reduce brake effectiveness
Contaminated linings normally require replacement
Manual adjustment can conceal underlying mechanical problems

Driver and Operator Experience

A properly maintained Q Plus brake provides predictable stopping performance and familiar pedal response. Because it is a drum brake, its performance may change as brake temperature rises during repeated or prolonged applications.

Drivers should report:

Vehicle pulling during braking
Increased stopping distance
Low-air warnings
ABS warning lamps
Burning odors
Brake smoke
Grinding or scraping noises
Brakes grabbing
Delayed brake release
Trailer-brake imbalance
Unusual air loss
Excessive pushrod travel
Different wheel-end temperatures
Parking brakes that fail to hold

Drivers should avoid riding the brakes on long descents. Proper speed selection and engine braking reduce heat buildup and protect the foundation brakes.

Maintenance and Ownership Notes

Inspect brake-lining thickness
Measure applied pushrod stroke
Inspect brake drums for cracks
Measure brake-drum diameter
Check drums for heat damage
Inspect shoes for contamination
Check anchor pins and bushings
Inspect brake rollers
Check return springs
Inspect camshaft splines
Check camshaft bushings
Inspect camshaft seals
Lubricate specified grease fittings
Inspect slack-adjuster operation
Check slack-adjuster mounting
Inspect chamber brackets
Check brake chambers for damage
Inspect pushrods, clevises, and pins
Check air hoses and fittings
Inspect dust shields when equipped
Compare wheel-end temperatures
Inspect ABS sensors and tone rings
Verify mounting-fastener security
Use approved Meritor replacement parts

Common Brake-System Problems

Excessive pushrod stroke: Incorrect initial setup, worn linings, an oversized drum, worn camshaft components, an incorrect slack adjuster, or a malfunctioning automatic slack adjuster may produce excessive stroke.
Brake dragging: A seized camshaft, weak or broken return springs, a binding slack adjuster, damaged shoes, restricted air flow, or a chamber that does not release may keep the brake applied.
Uneven lining wear: Worn anchor pins, damaged rollers, distorted shoes, a worn drum, camshaft movement, incorrect components, or improper installation may create uneven contact.
Brake pulling: Unequal adjustment, different friction materials, contaminated linings, chamber problems, air-pressure differences, or uneven axle loading can cause side-to-side imbalance.
Brake fade: Excessive temperature can reduce friction between the linings and drum. Long descents, repeated hard stops, overloading, or poor brake balance may contribute to overheating.
Cracked brake drum: Excessive heat, improper wheel installation, overloading, severe braking, wear beyond the service limit, or manufacturing damage may cause cracking.
Grease- or oil-contaminated lining: A failed wheel seal, excessive lubrication, or improper service practices can contaminate the friction material.
Automatic slack adjuster repeatedly out of adjustment: Incorrect installation, worn components, excessive drum diameter, chamber-bracket movement, or an internal adjuster problem may be responsible.
Camshaft wear: Insufficient lubrication, damaged seals, worn bushings, corrosion, or contamination can cause excessive camshaft movement.
Brake noise: Loose components, worn rollers, damaged springs, cracked drums, contaminated linings, or improper shoe-to-drum contact may produce squealing, scraping, or knocking.

Safety and Service Precautions

Air brake systems contain stored pneumatic and mechanical energy. The vehicle must be secured before the brake is inspected or disassembled.

Before servicing a Q Plus brake:

Park on a firm and level surface
Apply appropriate wheel chocks
Support raised axles with approved stands
Drain or isolate air pressure as directed
Cage spring brakes when required
Never open a spring-brake chamber
Allow hot drums to cool naturally
Wear eye and hand protection
Use appropriate lifting equipment
Control brake dust
Follow approved torque procedures
Test the brake before road operation

Brake drums are heavy and can cause injury if handled without proper equipment. Hot drums should not be rapidly cooled with water because thermal shock may damage the drum.

Brake dust should not be cleaned with compressed air. Use approved brake-cleaning and dust-control procedures.

Identification Information

Identification information may be found on the axle tag, brake shoe, lining edge, camshaft, slack adjuster, chamber, brake drum, or vehicle build records.

Record the following information:

Vehicle manufacturer
Vehicle identification number
Vehicle model and model year
Axle manufacturer
Axle model
Axle serial number
Gross axle weight rating
Q Plus brake designation
Brake diameter
Brake lining width
Brake shoe part number
Friction-lining code
Camshaft part number
Camshaft length
Camshaft rotation
Camshaft spline
Slack-adjuster part number
Slack-adjuster length
Brake chamber manufacturer
Brake chamber size
Brake drum part number
Hub configuration
Wheel size
ABS configuration

The complete identification information should be collected before parts are removed or discarded.

Buying Considerations

Confirm the Q Plus brake designation
Identify the axle model and serial number
Verify the brake diameter
Measure or identify the lining width
Match the brake shoe geometry
Confirm the friction-lining code
Identify camshaft rotation
Verify camshaft length and spline
Match the slack-adjuster length
Confirm the brake chamber size
Identify steer, drive, trailer, or auxiliary position
Check drum diameter and service condition
Determine whether hardware is included
Inspect anchor pins and rollers
Check return-spring condition
Inspect camshaft bushings and seals
Verify ABS component compatibility
Confirm gross axle weight rating
Choose friction material for the duty cycle
Use a qualified commercial brake supplier

Variants and Configurations

Steer-axle Q Plus brake
Drive-axle Q Plus brake
Trailer-axle Q Plus brake
Auxiliary-axle Q Plus brake
Line-haul configuration
Vocational configuration
Severe-duty configuration
Bus and coach configuration
Different brake diameters
Different lining widths
Different friction materials
Left-hand camshaft
Right-hand camshaft
Different camshaft lengths
Different camshaft splines
Manual slack-adjuster configuration
Automatic slack-adjuster configuration
Service-brake chamber configuration
Spring-brake chamber configuration
Different drum and hub arrangements
ABS-equipped configuration
Application-specific dust shields

Comparison to Similar Equipment

Compared with the Hendrickson MAXX22T Trailer Air Disc Brake, the Q Plus uses brake shoes pressing against the inside of a drum. The MAXX22T uses a caliper and pads that clamp a disc rotor.

Compared with the Meritor EX+ LS Air Disc Brake, the Q Plus represents Meritor’s traditional S-cam drum-brake architecture. The EX+ LS uses a lightweight single-piston air-disc-brake design.

Compared with the Bendix ADB22X Air Disc Brake, the Q Plus has more external mechanical adjustment and camshaft components. The ADB22X provides easier visual access to its pads and rotor.

Compared with other S-cam drum brakes, the Q Plus offers established Meritor parts support and application-specific brake, friction, and wheel-end configurations. Interchangeability must still be verified by part number and axle specification.

Best Fit For

Vehicles originally equipped with Q Plus brakes
Heavy-duty line-haul tractors
Commercial trailers
Vocational trucks
Dump trucks
Concrete mixers
Refuse vehicles
Construction equipment
Heavy-haul vehicles
Buses and motorcoaches
Fleets prioritizing widely available service parts
Operations with established drum-brake maintenance programs
Vehicles requiring application-specific friction materials
Fleets operating mixed truck and trailer equipment

Related Vehicle and Trailer Types

Complete Guide to Semi Truck Types
Complete Guide to Semi-Trailer Types
Class 7 trucks
Class 8 trucks
Sleeper tractors
Day cab tractors
Vocational trucks
Dump trucks
Concrete mixers
Refuse trucks
School buses
Motorcoaches
Dry van trailers
Refrigerated trailers
Flatbed trailers
Tank trailers
Specialty commercial vehicles

Related Truck and Trailer Models

Related Brake System Types

Brake Systems
Air Brake Systems
Drum Brake Systems
Trailer Brake Systems
Brake Chambers & Actuators
ABS & Electronic Braking Systems
S-cam foundation brakes
Service-brake systems
Spring parking brakes
Emergency-brake systems
Automatic slack-adjuster systems

Related Brake Products

Meritor EX+ LS Air Disc Brake
Hendrickson MAXX22T Trailer Air Disc Brake
Bendix ADB22X Air Disc Brake
Bendix ADB22X-LT Air Disc Brake
Haldex ModulT Air Disc Brake
ZF WABCO MAXXUS L2.0 Air Disc Brake
Bendix SR-7 Spring Brake Modulating Valve
Automatic slack adjusters
Air brake chambers
Spring-brake chambers
Commercial brake drums
Commercial brake shoes
ABS modulator valves

Related Equipment Systems

Equipment Systems
Axles & Differentials
Suspension Systems
Tires & Wheels
Compressed-air systems
Steer axles
Drive axles
Trailer axles
Wheel-end systems
Vehicle stability systems

Related Guides

Regulatory and Compliance Notes

Commercial-vehicle brakes must meet the applicable safety, inspection, and stopping-performance requirements for the jurisdiction in which the vehicle operates.

Inspectors may evaluate:

Applied pushrod stroke
Brake adjustment
Lining thickness
Drum condition
Chamber condition
Air leakage
Slack-adjuster operation
Missing or damaged components
Contaminated friction material
ABS warning-lamp operation
Parking-brake performance
Brake balance

A brake can be placed out of service if its pushrod stroke exceeds the applicable limit or if essential components are broken, missing, contaminated, improperly secured, or worn beyond allowable specifications.

Replacing a chamber, slack adjuster, lining, drum, or camshaft with an unapproved component can change braking performance. The complete vehicle must remain consistent with its brake certification.

Real World Operating Notes

Brake adjustment should be verified by measuring applied pushrod stroke. Visual position alone does not establish whether a Q Plus brake is operating within its allowable range.

Repeatedly adjusting an automatic slack adjuster is not a complete repair. The technician should determine why the brake is losing adjustment.

Wheel-end temperatures can help locate a problem. A hotter brake may be dragging or performing excessive work, while a cooler brake may not be applying correctly.

Brake drums and friction linings should be evaluated as a system. Installing new shoes against a damaged, oversized, or severely heat-checked drum can reduce performance and shorten lining life.

Friction material should be matched across the axle. Mixing substantially different lining formulations can cause uneven braking and temperature differences.

After brake shoes, drums, or major mechanical components are replaced, the brakes should be inspected and burnished according to the applicable service procedures.

Frequently Asked Questions

What is the Meritor Q Plus Cam Brake?

The Q Plus is a heavy-duty pneumatically operated S-cam drum brake used on commercial trucks, trailers, buses, and vocational vehicles.

What does Q+ mean?

Q+ is the common marking and shortened name for Meritor’s Q Plus drum-brake family.

Is the Q Plus an air disc brake?

No. It is an S-cam drum brake that uses brake shoes and friction linings inside a rotating brake drum.

Where is the Q Plus used?

Depending on its configuration, it can be used on steer, drive, trailer, and auxiliary axles.

Does it use an automatic slack adjuster?

Many Q Plus applications use an automatic slack adjuster, although the exact equipment depends on the vehicle and axle specification.

How does the S-cam apply the brake?

The brake chamber and slack adjuster rotate the camshaft. The S-shaped cam head pushes the brake rollers and shoes outward against the drum.

Why is pushrod stroke important?

Pushrod stroke indicates how far the chamber must move to apply the brake. Excessive stroke can indicate wear, incorrect adjustment, component problems, or an oversized drum.

Should an automatic slack adjuster be manually adjusted?

Manual adjustment may be required during approved installation or service procedures. Repeatedly readjusting an automatic slack adjuster without diagnosing the cause is not an acceptable repair.

What causes uneven brake-shoe wear?

Possible causes include worn anchor pins, camshaft movement, damaged rollers, incorrect installation, distorted shoes, drum problems, or the wrong components.

Are all Q Plus brake shoes interchangeable?

No. Brake diameter, lining width, shoe geometry, friction material, and axle application must match.

How can the correct replacement parts be identified?

Use the vehicle VIN, axle tag, brake size, shoe and lining numbers, camshaft information, slack-adjuster number, chamber size, and drum number.

Is the Q Plus still supported?

Yes. Meritor-branded braking products continue to be supported through Cummins Drivetrain and Braking Systems and its commercial-vehicle aftermarket network.

Availability and Where to Find

Meritor Q Plus brakes and replacement components are available through commercial-truck dealers, trailer dealers, Cummins and Meritor distributors, heavy-duty parts suppliers, brake specialists, fleet-service facilities, and authorized repair centers.

Available components may include brake shoes, friction linings, hardware kits, rollers, springs, anchor pins, camshafts, bushings, seals, slack adjusters, brake chambers, drums, and wheel-end parts.

Before ordering, buyers should confirm the axle model, Q Plus brake size, lining width, friction code, camshaft configuration, slack-adjuster length, chamber size, and drum specification.

Current product information, technical literature, and aftermarket support are available through the Cummins Drivetrain and Braking Systems website and its brake-products section.

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