Bendix EverSure Spring Brake

Quick Facts

Manufacturer: Bendix Commercial Vehicle Systems
Original Manufacturer Organization: Bendix Spicer Foundation Brake
Product Family: EverSure
Product Type: Double-diaphragm combination spring brake chamber
Primary Functions: Service braking, parking braking, and emergency braking
Foundation-Brake Compatibility: Drum and air disc brakes, depending on model
Common Drum-Brake Size: Type 30/30
Other Available Sizes: Application-specific drum- and air-disc-brake configurations
Common Rated Stroke: 2.5 or 3.0 inches on Type 30/30 models
Power-Spring Technology: Bendix No Touch design
Corrosion Protection: Epoxy-coated power spring with reduced coil contact
Installation Options: Standard pushrod, threaded clevis, welded clevis, and piggyback configurations
Common Positions: Drive, trailer, auxiliary, and other parking-brake-equipped axles
Primary Applications: Trucks, tractors, trailers, buses, and vocational vehicles
Original Warranty Positioning: Four-year coverage under qualifying applications and terms
Current Product Status: Legacy product replaced in Bendix’s current lineup by the EnduraSure Spring Brake Series
Primary Benefit: Lightweight actuation with improved power-spring durability and corrosion resistance

Overview

The Bendix EverSure is a double-diaphragm spring brake chamber designed to provide service, parking, and emergency braking on commercial vehicles. It was offered for both S-cam drum brakes and air disc brake applications in several chamber sizes, strokes, pushrod lengths, and mounting configurations.

The EverSure’s best-known feature is Bendix’s No Touch power spring. The spring was engineered with additional active coils and greater space between the coils to reduce contact while the spring was compressed.

Reducing coil contact helps preserve the spring’s protective epoxy coating. This addresses corrosion caused when repeated coil contact damages the coating and exposes the underlying metal.

The EverSure combines a conventional service chamber with a mechanically powered parking and emergency section. During normal driving, compressed air holds the power spring in its released position. When the parking brakes are applied—or supply pressure is lost—the power spring extends and mechanically applies the foundation brake.

EverSure was also designed to reduce weight. Bendix described its Type 30/30 design as more than two pounds lighter than several competing spring chambers available during its original introduction.

EverSure is now a legacy Bendix product. The current Bendix actuator lineup states that the EnduraSure Spring Brake Series builds on and replaces EverSure. Existing EverSure-equipped vehicles can still require EverSure identification, service information, or approved replacement cross-references.

Key Characteristics

Double-diaphragm combination spring brake
Service-brake chamber section
Parking and emergency spring section
No Touch power-spring technology
Increased spacing between spring coils
Reduced power-spring coil contact
Epoxy-coated power spring
Improved corrosion resistance
Slotted center-seal design
Lightweight chamber construction
Standard and long-stroke configurations
Drum-brake configurations
Air-disc-brake configurations
Standard pushrod options
Threaded-clevis options
Welded-clevis options
Piggyback replacement assemblies
Industry-standard mounting dimensions

Major Components

Service chamber housing
Service diaphragm
Service return spring
Service pushrod
Pushrod plate
Clamp band
Mounting studs
Air inlet port
Parking and emergency chamber housing
Power spring
Spring diaphragm
Center seal
Spring-brake pushrod
Release bolt
Release-bolt storage pocket
Dust plug
Breather or venting components
Threaded clevis when equipped
Welded clevis when equipped
Clevis pin
Jam nut
Mounting hardware
Product identification label
Stroke and chamber-size markings

How the Brake Component or System Works

During a normal service-brake application, compressed air enters the service side of the EverSure. The air acts against the service diaphragm, moving the pushrod outward.

On an S-cam brake, the pushrod moves the slack adjuster, which rotates the camshaft and applies the brake shoes against the drum. On an air disc brake, the chamber applies the caliper’s operating mechanism.

When the service brake is released, air leaves the service chamber. The service return spring retracts the diaphragm and pushrod.

The parking and emergency section operates differently. A powerful mechanical spring is held compressed by air pressure while the vehicle is operating.

When the driver applies the parking brake, air is exhausted from the spring section. The power spring expands and mechanically moves the brake pushrod.

If system pressure is lost, the power spring can also apply the brakes automatically. The exact emergency application depends on the vehicle’s spring-brake valves and pneumatic system.

Position and Function Within the Brake System

The EverSure mounts near the foundation brake and converts pneumatic pressure or stored spring force into linear pushrod movement.

It performs three primary functions:

Applies the service brake when air enters the service chamber
Applies the parking brake when air is released from the spring chamber
Provides emergency braking when spring-brake supply pressure falls

On a typical S-cam installation, the force path includes:

Brake-control valve
Relay or ABS-modulator valve
EverSure service chamber
Pushrod and clevis
Automatic slack adjuster
Camshaft
S-cam
Brake shoes
Brake drum

During a parking or emergency application, the power spring supplies the mechanical force rather than normal service air pressure.

Common Specifications

Product Type: Double-diaphragm combination spring brake
Common Drum-Brake Size: Type 30/30
Common Standard Stroke: 2.5 inches
Common Long Stroke: 3.0 inches
Common Drum-Brake Pushrod Lengths: Application-specific, including documented 5.62-, 7.8-, 8.0-, and 12.0-inch configurations
Clevis Options: Standard pushrod, threaded clevis, or welded clevis
Piggyback Option: Replacement spring section available for approved configurations
Power Spring: No Touch epoxy-coated spring
Center Seal: Slotted design
Actuation: Pneumatic service braking and mechanical spring parking braking
Mounting: Industry-standard application-specific bracket and stud arrangement
Foundation Brakes: S-cam drum brake or compatible air disc brake, depending on part number
Air Disc Brake Sizes: Documented configurations include Type 16/24, 18/24, 20/24, 22/24, and 24/24
Original Normal-Duty Warranty: Four years with unlimited mileage and hours under applicable warranty terms
Original Severe-Duty Warranty: Two years or the applicable mileage and hour limits stated in Bendix warranty documentation
Current Replacement Family: Bendix EnduraSure

The chamber type, stroke, pushrod length, clevis, mounting angle, port orientation, bracket, and foundation-brake application must be confirmed before replacement.

Operating Specifications and Performance

The EverSure was designed to provide sufficient pushrod force and reserve stroke across normal service, parking, and emergency operating conditions.

Bendix documented several performance features:

Increased power-spring life
Reduced power-spring coil contact
Improved corrosion resistance
Increased braking reserve
Reduced chamber weight
Industry-standard mounting dimensions
Service replacement coverage for common applications

Bendix reported that the No Touch design increased the height between the power-spring coils by approximately 33 percent compared with a typical Type 30/30 spring brake. The company also reported up to three times the power-spring life of competing and earlier Bendix designs under applicable testing.

The EverSure’s actual output depends on:

Chamber size
Chamber stroke
Applied air pressure
Power-spring condition
Pushrod length
Clevis setting
Slack-adjuster length
Foundation-brake geometry
Brake adjustment
Vehicle application

A larger chamber number does not automatically make a chamber suitable for a particular brake. The complete actuation and foundation-brake system must be matched.

Braking Performance and System Integration

The EverSure must work with the correct slack adjuster, camshaft, brake chamber bracket, foundation brake, and pneumatic controls.

On an S-cam brake, the chamber’s pushrod force is multiplied through the slack adjuster. Changing chamber size or slack-adjuster length alters brake torque.

Incorrect components can cause:

Insufficient braking force
Excessive braking force
Brake imbalance
Excessive pushrod stroke
Brake drag
Premature wheel lockup
ABS intervention
Component interference
Reduced parking-brake holding ability

Chamber size, stroke, and slack-adjuster length should normally match across an axle unless the vehicle manufacturer specifies otherwise.

Long-stroke chambers must be identified and replaced with compatible long-stroke units. Installing a standard-stroke chamber in a long-stroke application can reduce available reserve stroke and violate the vehicle’s approved brake configuration.

Air Supply, Controls, and Electronic Integration

The EverSure depends on the vehicle’s compressed-air system for normal service braking and spring-brake release.

It can operate with:

Service brake valves
Relay valves
Quick-release valves
Spring-brake relay valves
Spring-brake modulating valves
Tractor-protection systems
Trailer emergency systems
Antilock braking systems
Automatic traction control
Electronic stability control
Trailer roll-stability systems

The service and spring ports must be connected correctly. Reversing air lines can cause improper or unsafe brake operation.

ABS modulator valves control pressure delivered to the service chamber. They do not normally control the mechanical force stored in the parking-brake power spring.

Systems using a spring-brake modulating valve, such as the Bendix SR-7 Spring Brake Modulating Valve, can use service-system air to modulate spring-brake application during certain failure conditions.

Installation, Adjustment, and Brake Balance

The replacement EverSure or approved successor must match the original chamber’s dimensions and operating characteristics.

Important installation checks include:

Confirming chamber type
Verifying service and spring-chamber sizes
Confirming standard or long stroke
Matching pushrod length
Checking threaded or welded clevis
Confirming mounting-stud spacing
Matching port orientation
Checking bracket angle
Inspecting mounting hardware
Verifying slack-adjuster length
Setting the clevis correctly
Confirming the correct installed angle
Checking pushrod alignment
Inspecting air-hose routing
Verifying suspension and axle clearance
Measuring applied pushrod stroke
Testing service-brake operation
Testing parking-brake operation
Checking for air leakage

The pushrod should travel in line with the slack adjuster. Misalignment can cause side loading, premature seal wear, binding, or damaged brackets.

A welded-clevis chamber can reduce setup time because the clevis position is established for a specific application. The correct vehicle-specific chamber must still be selected.

Foundation Brake, Axle, and Wheel-End Compatibility

EverSure configurations were offered for S-cam drum and air disc brakes. The selected chamber must match the brake’s actuation requirements.

Compatibility depends on:

Foundation-brake type
Brake manufacturer and model
Axle manufacturer
Axle position
Chamber mounting bracket
Chamber type
Service-section size
Spring-section size
Rated stroke
Pushrod length
Clevis design
Slack-adjuster length
Port orientation
Available clearance
Vehicle brake certification

Common drum-brake applications used Type 30/30 chambers. Other applications could use Type 24/30 or specialized arrangements.

Documented air-disc-brake EverSure configurations included Type 16/24, 18/24, 20/24, 22/24, and 24/24 chambers with application-specific strokes.

A drum-brake chamber should not be substituted for an air-disc-brake chamber solely because its mounting studs appear compatible.

Common Applications

Line-haul tractors
Regional-haul tractors
Heavy-duty straight trucks
Delivery trucks
Dump trucks
Concrete mixers
Refuse trucks
Logging trucks
Construction vehicles
Tank trucks
Municipal vehicles
School buses
Transit buses
Motorcoaches
Fire apparatus
Motorhomes
Dry van trailers
Refrigerated trailers
Flatbed trailers
Tank trailers
Dump trailers
Hopper trailers
Container chassis
Specialty commercial vehicles

Vehicle and Brake-System Compatibility

EverSure was designed around common industry dimensions, but the correct chamber must be identified for each vehicle and axle.

Compatibility should be verified using:

Vehicle identification number
Truck or trailer manufacturer
Vehicle model and model year
Axle manufacturer
Axle model
Foundation-brake type
Original chamber part number
Chamber type
Rated stroke
Pushrod length
Clevis type
Mounting-stud dimensions
Port orientation
Slack-adjuster information
Brake chamber bracket
ABS configuration
Vehicle vocation

An approved Bendix cross-reference should be used when replacing EverSure with an EnduraSure model. The new chamber must preserve the original size, stroke, mounting, pushrod, and actuation requirements.

Advantages

Service, parking, and emergency braking in one assembly
No Touch power-spring design
Reduced spring-coil contact
Improved power-spring coating protection
Enhanced corrosion resistance
Epoxy-coated power spring
Additional active spring coils
Increased reserve stroke
Lightweight chamber construction
Industry-standard mounting dimensions
Standard and long-stroke configurations
Drum- and air-disc-brake options
Threaded-clevis availability
Welded-clevis availability
Piggyback replacement options
Established Bendix support network

Limitations or Considerations

EverSure has been replaced by EnduraSure
Legacy part numbers may be superseded
Spring section contains dangerous stored energy
Spring housing must never be disassembled
Correct chamber size must be identified
Standard- and long-stroke chambers are not interchangeable
Pushrod length must match the application
Clevis position affects brake geometry
Port orientation may vary
Drum- and disc-brake chambers differ
Corrosion can still occur after physical damage
Air leaks can affect service or parking operation
Incorrect installation can cause brake imbalance
Power spring adds weight to the wheel-end system
Replacement must preserve the vehicle’s brake certification

Driver and Operator Experience

A properly operating EverSure should provide normal service-brake response and secure parking-brake application. Drivers should notice the parking brakes releasing when sufficient air pressure reaches the spring chamber.

The driver should report:

Parking brakes that release slowly
Parking brakes that do not release
Parking brakes that fail to hold
Air leaking near a chamber
Vehicle pulling during braking
Increased stopping distance
Low-air warnings
ABS warning lamps
Brake dragging
Burning odors
Wheel-end smoke
Unusual brake noises
Unexpected spring-brake application

A vehicle should not be driven if a spring brake cannot fully release, if a chamber is physically damaged, or if severe air leakage is present.

Maintenance and Ownership Notes

Inspect the chamber housing
Check for corrosion
Inspect mounting studs
Check mounting nuts
Inspect the clamp band
Check air ports
Inspect hoses and fittings
Check pushrod alignment
Inspect the clevis
Check the clevis pin
Inspect retaining clips
Verify slack-adjuster alignment
Measure applied pushrod stroke
Check service-brake operation
Test parking-brake application
Test parking-brake release
Listen for air leakage
Inspect the release bolt
Keep the release-bolt opening sealed
Check suspension clearance
Inspect for impact damage
Confirm chamber identification
Use an approved Bendix replacement
Never open the spring housing

Common Brake-System Problems

Spring brake will not release: Low system pressure, restricted air lines, a faulty parking-brake valve, leaking diaphragm, damaged center seal, frozen components, or a broken power spring may prevent release.
Spring brake releases slowly: Restricted hoses, a contaminated valve, low air delivery, internal chamber damage, or incorrect plumbing may delay release.
Parking brake will not hold: A weak or broken power spring, excessive foundation-brake clearance, incorrect adjustment, worn linings, oversized drums, caliper problems, or the wrong chamber may reduce holding force.
Service-brake air leak: A damaged diaphragm, loose clamp, corroded housing, cracked hose, damaged fitting, or leaking port may cause pressure loss.
Leak between chamber sections: A damaged center seal can allow air to transfer between the service and spring sections.
Excessive pushrod stroke: Worn friction material, an oversized drum, incorrect slack-adjuster setup, damaged foundation-brake components, or the wrong chamber geometry may increase stroke.
Brake dragging: Misaligned pushrod, incorrect clevis setting, restricted exhaust, foundation-brake binding, damaged chamber components, or a power spring that does not fully compress may cause drag.
Chamber corrosion: Road salt, moisture, damaged coating, missing plugs, or physical damage can corrode the chamber or power spring.
Broken power spring: Corrosion, damaged protective coating, spring fatigue, impact damage, or contamination may lead to failure.
Uneven braking: Different chamber sizes, unequal strokes, mismatched slack adjusters, air-pressure differences, or foundation-brake problems may cause imbalance.

Safety and Service Precautions

The EverSure contains a powerful compressed spring capable of causing severe injury or death. The sealed parking-brake housing must never be opened, cut, welded, drilled, or disassembled.

Before servicing the chamber:

Park on a firm and level surface
Chock the wheels
Follow the approved spring-brake caging procedure
Drain or isolate air pressure
Support raised equipment with approved stands
Wear eye and hand protection
Confirm the brake is fully released
Use the correct release bolt
Inspect the release bolt before use
Keep hands clear of moving pushrods
Follow Bendix service instructions
Replace damaged hardware
Test the brake before road service

Caging the power spring mechanically releases the parking brake for servicing or towing. It does not repair the chamber or make a damaged unit safe to disassemble.

A spring-brake chamber with severe corrosion, impact damage, an unsecured clamp, or a damaged housing should be replaced using approved procedures.

Identification Information

EverSure identification may be found on the chamber label, housing, clamp, pushrod configuration, or vehicle build records.

Record the following information:

Vehicle manufacturer
Vehicle identification number
Vehicle model and model year
Axle manufacturer
Axle position
Foundation-brake type
Bendix part number
EverSure product marking
Chamber type
Service-section size
Spring-section size
Rated stroke
Standard- or long-stroke designation
Pushrod length
Threaded or welded clevis
Mounting-stud spacing
Port orientation
Brake chamber bracket
Slack-adjuster length
Drum- or air-disc-brake application

A Type 30/30 description alone is insufficient. Stroke, pushrod, clevis, mounting, and port details must also match.

Buying Considerations

Confirm the original Bendix part number
Determine whether EverSure has been superseded
Use the approved EnduraSure cross-reference
Identify drum- or air-disc-brake use
Confirm chamber type
Verify rated stroke
Identify standard or long stroke
Measure pushrod length correctly
Confirm clevis type
Check mounting-stud spacing
Verify port orientation
Confirm brake bracket compatibility
Match the slack-adjuster length
Inspect air-hose routing
Check available clearance
Confirm vehicle vocation
Replace chambers in axle pairs when appropriate
Purchase through an authorized supplier
Follow the current Bendix service information

Variants and Configurations

Type 24/30 drum-brake configuration
Type 30/30 drum-brake configuration
Standard-stroke chamber
Long-stroke chamber
2.5-inch-stroke Type 30/30
3.0-inch-stroke Type 30/30
Standard pushrod
Threaded clevis
Welded clevis
Different pushrod lengths
Complete combination chamber
Piggyback replacement chamber
Type 16/24 air-disc-brake chamber
Type 18/24 air-disc-brake chamber
Type 20/24 air-disc-brake chamber
Type 22/24 air-disc-brake chamber
Type 24/24 air-disc-brake chamber
Truck configuration
Trailer configuration
Bus configuration
Vocational configuration

Comparison to Similar Equipment

Compared with the Bendix EnduraSure Spring Brake, EverSure is the earlier product generation. EnduraSure builds on the No Touch power-spring concept with additional durability and performance improvements.

Compared with Bendix EnduraSure-Pro, EverSure does not use the newer fully sealed design and integrated check-valve protection offered on applicable EnduraSure-Pro air-disc-brake chambers.

Compared with a service-only brake chamber, EverSure contains both a service section and a power-spring section. A service chamber cannot provide mechanical parking or emergency-brake application by itself.

Compared with a conventional combination chamber, EverSure uses Bendix’s No Touch power spring to reduce coil contact and protect the spring coating.

Compared with the Bendix SR-7 Spring Brake Modulating Valve, EverSure converts air pressure and stored spring energy into mechanical braking force. The SR-7 controls air delivery and modulation within the spring-brake system.

Compared with the Bendix ADB22X Air Disc Brake, EverSure is an actuator rather than a complete foundation brake. An approved spring chamber supplies mechanical input to the ADB22X caliper.

Best Fit For

Vehicles originally equipped with EverSure chambers
Approved EverSure service replacements
Approved EnduraSure conversions
Heavy-duty tractors
Commercial trailers
Straight trucks
Vocational vehicles
Buses and motorcoaches
Vehicles using Type 30/30 chambers
Standard-stroke applications
Long-stroke applications
Fleets prioritizing corrosion resistance
Applications using welded clevises
Vehicles requiring parking and emergency braking
Maintenance programs familiar with spring-brake safety

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
Heavy-haul vehicles
School buses
Transit buses
Motorcoaches
Dry van trailers
Refrigerated trailers
Flatbed trailers
Tank trailers
Dump trailers
Container chassis

Related Truck and Trailer Models

Related Brake System Types

Related Brake Products

Bendix SR-7 Spring Brake Modulating Valve
Bendix ADB22X Air Disc Brake
Bendix ADB22X-LT Air Disc Brake
Meritor Q Plus Cam Brake
Meritor Q Plus LX500 Cam Brake
Gunite 3600A Brake Drum
Webb Vortex Unlimited Brake Drum
ConMet TruTurn Brake Drum
Automatic slack adjusters
Service brake chambers
Spring-brake relay valves
Air brake hoses
Air disc brake calipers

Related Equipment Systems

Equipment Systems
Axles & Differentials
Suspension Systems
Tires & Wheels
Compressed-air systems
Drive axles
Trailer axles
Foundation brakes
Vehicle stability systems
Parking-brake controls

Related Guides

Regulatory and Compliance Notes

Spring brake chambers must match the vehicle’s approved braking-system configuration. Chamber type, stroke, pushrod length, mounting, slack-adjuster length, and foundation-brake geometry affect braking force and reserve stroke.

Inspectors may evaluate:

Chamber condition
Mounting security
Air leakage
Pushrod stroke
Chamber-size matching
Standard- or long-stroke identification
Parking-brake operation
Spring-brake release
Hoses and fittings
Clevis and pin condition
Foundation-brake adjustment
Missing or damaged components

Long-stroke chambers normally use required identification markings. They should not be replaced with standard-stroke chambers.

A chamber that is leaking, severely corroded, improperly mounted, mismatched, or unable to apply or release the brake correctly can place the vehicle out of service.

Real World Operating Notes

EverSure identification is important because the chambers may resemble later EnduraSure products or competing Type 30/30 chambers.

When replacing an older EverSure, use the current Bendix cross-reference. Do not select a chamber based only on the 30/30 designation.

A welded-clevis replacement can reduce installation time, but only when the pushrod length and clevis position match the vehicle application.

Repeated manual adjustment of the automatic slack adjuster is not a spring-chamber repair. Excessive stroke requires inspection of the complete foundation brake.

Spring brakes may apply when system pressure becomes too low. Drivers and technicians should never assume that loss of air pressure leaves the brake released.

A caged spring brake does not provide parking or emergency application at that wheel end. The vehicle must be properly secured while the chamber is caged.

Frequently Asked Questions

What is the Bendix EverSure Spring Brake?

EverSure is a double-diaphragm combination chamber that provides service, parking, and emergency braking for commercial vehicles.

Is EverSure still Bendix’s current spring brake?

No. Bendix states that its current EnduraSure Spring Brake Series builds on and replaces EverSure.

What is No Touch technology?

It is a power-spring design with greater space between the coils, helping reduce coil contact and damage to the protective coating.

Why is reducing coil contact important?

Repeated contact can damage the coating, expose the spring metal, and lead to corrosion and spring failure.

What is a Type 30/30 spring brake?

It combines a Type 30 service chamber with a Type 30 spring-brake section. Stroke and other dimensions must still be confirmed.

Does EverSure come in long-stroke configurations?

Yes. Documented Type 30/30 configurations include both 2.5-inch standard-stroke and 3.0-inch long-stroke versions.

Can EverSure be used with air disc brakes?

Yes. Bendix offered application-specific EverSure chambers for compatible air disc brakes in several sizes.

What happens when air pressure is lost?

As spring-brake supply pressure falls, the power spring can mechanically apply the brake according to the vehicle’s pneumatic system design.

Can the spring-brake housing be opened?

No. The sealed power-spring housing contains dangerous stored energy and must never be opened, drilled, cut, or welded.

What does caging the spring brake do?

Caging mechanically compresses the power spring so the parking brake can be released for approved service or towing procedures.

Can a standard-stroke chamber replace a long-stroke chamber?

No. The replacement must preserve the approved stroke and actuation geometry.

How can the correct replacement be identified?

Use the Bendix part number, chamber type, stroke, pushrod length, clevis, mounting dimensions, port orientation, foundation-brake type, and vehicle information.

Availability and Where to Find

EverSure is a legacy Bendix product that has been replaced by the EnduraSure Spring Brake Series. Original EverSure chambers, piggyback assemblies, diaphragms, dust plugs, and service components may still be available through existing inventory and heavy-duty parts suppliers.

For current replacement service, buyers should use Bendix’s actuator cross-reference to identify the correct EnduraSure equivalent.

Replacement chambers may be available through Bendix distributors, commercial-truck dealers, trailer dealers, fleet-parts suppliers, brake specialists, and authorized repair facilities.

Current actuator information, product literature, replacement resources, and technical support are available through the Bendix actuator product page.

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