Haldex Gold Seal Spring Brake

Quick Facts

Manufacturer: Haldex
Original Brand: Anchorlok
Current Product Name: GoldSeal+ Combination Spring Brake
Common Name: Gold Seal Spring Brake
Product Type: Double-diaphragm combination spring brake actuator
Primary Functions: Service braking, parking braking, and emergency braking
Primary Foundation Brake: S-cam drum brake
Common Chamber Sizes: Type 24/24, 24/30, 30/30, 30/36, and 36/36, depending on application
Common Type 30/30 Stroke: 2.5-inch standard or 3-inch long stroke, depending on model
Center-Seal Design: Double O-ring center seal
Spring Protection: Corrosion- and fatigue-resistant power spring
Housing Protection: Zinc plating and advanced powder coating, depending on component and model
Installation Options: Standard pushrod, threaded clevis, welded clevis, and piggyback configurations
Primary Applications: Trucks, tractors, trailers, buses, and vocational vehicles
Current Related Premium Product: Haldex LifeSeal+ sealed spring brake
Primary Benefit: Broad application coverage with durable power-spring, center-seal, and corrosion-protection features

Overview

The Haldex Gold Seal is a double-diaphragm combination spring brake actuator used on commercial trucks, tractors, trailers, buses, and vocational vehicles. The current product family is marketed as the GoldSeal+ Combination Spring Brake.

Gold Seal combines a pneumatic service-brake chamber with a mechanical parking and emergency-brake section. During normal braking, compressed air moves the service diaphragm and pushrod. During parking or certain air-pressure failures, a powerful mechanical spring applies the foundation brake.

The product traces its history to Anchorlok, an early spring-brake manufacturer acquired by Haldex in 2001. Gold Seal became a widely used original-equipment and replacement actuator across North American truck and trailer applications.

Current GoldSeal+ features include Haldex power-spring technology, an advanced protective coating process, a double O-ring center seal, durable rubber compounds, and application-specific pushrod and clevis arrangements.

Gold Seal should not be confused with Haldex LifeSeal+. GoldSeal+ is a durable vented combination spring brake, while LifeSeal+ is Haldex’s fully sealed premium design for applications seeking additional protection from moisture and contamination.

The exact chamber size, stroke, pushrod length, clevis, mounting dimensions, and port orientation must be confirmed before replacement. Haldex GoldSeal+ product information

Key Characteristics

Double-diaphragm combination spring brake
Service-brake chamber section
Parking and emergency spring section
Superior power-spring technology
Resistance to corrosion and fatigue
Advanced powder-coated components
Zinc-plated spring housing on applicable models
Double O-ring center seal
Heat- and cold-resistant rubber compounds
Standard- and long-stroke configurations
Multiple chamber sizes
Standard pushrod options
Threaded-clevis options
Welded-clevis options
Piggyback replacement units
Truck and trailer application coverage
Heavy-duty vocational configurations
Original-equipment and aftermarket availability

Major Components

Service chamber housing
Service diaphragm
Service return spring
Service pushrod
Pushrod plate
Clamp band
Mounting studs
Service air port
Parking and emergency housing
Mechanical power spring
Spring-brake diaphragm
Pressure plate
Center-seal assembly
Double O-rings
Center-section housing
Spring-brake pushrod
Release or caging bolt
Caging-bolt storage point
Breather or vent holes
Dust plug
Threaded clevis when equipped
Welded clevis when equipped
Clevis pin
Cotter pin
Jam nut
Mounting hardware
Product-identification label
Stroke and chamber-size markings

How the Brake Component or System Works

During a service-brake application, compressed air enters the service section of the Gold Seal chamber. Air pressure acts against the service diaphragm and moves the pushrod outward.

The pushrod rotates the slack adjuster and camshaft. The S-cam spreads the brake shoes outward until the friction linings contact the rotating brake drum.

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

The parking and emergency section contains a powerful mechanical spring. During normal vehicle operation, compressed air holds this spring in its released position.

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

If spring-brake supply pressure falls because of a pneumatic-system failure, the power spring can also apply the brake automatically. The exact response depends on the vehicle’s valves and system configuration.

Position and Function Within the Brake System

The Gold Seal mounts to a brake chamber bracket near the foundation brake. It converts air pressure or stored spring force into linear pushrod movement.

It performs three principal functions:

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

In a typical S-cam drum-brake system, the force path includes:

Driver brake valve
Relay or ABS-modulator valve
Gold Seal service chamber
Pushrod and clevis
Automatic slack adjuster
Camshaft
S-cam
Brake shoes
Brake drum

The chamber does not control brake timing by itself. Relay valves, spring-brake valves, ABS modulators, and other pneumatic controls determine when air enters or leaves the actuator.

Common Specifications

Product Type: Double-diaphragm combination spring brake
Current Product Family: Haldex GoldSeal+
Primary Foundation Brake: S-cam drum brake
Common Chamber Sizes: Type 24/24, 24/30, 30/30, 30/36, and 36/36
Common Type 30/30 Standard Stroke: 2.5 inches
Common Type 30/30 Long Stroke: 3 inches
Air-Port Threads: Application-specific; 3/8-18 NPTF is common on many configurations
Maximum Air Pressure: Application-specific; 150 psi is listed for common Gold Seal models
Center Seal: Double O-ring design
Housing Protection: Zinc plating and powder coating, depending on model
Clevis Options: Threaded or welded
Replacement Options: Complete chamber or application-specific piggyback unit
Mounting: Application-specific stud and bracket arrangement
Warranty: Current GoldSeal literature lists standard four-year coverage; terms vary by product, vocation, mileage, and installation
Applications: Trucks, tractors, trailers, buses, and vocational vehicles

Exact specifications must be verified using the complete Haldex part number. A Type 30/30 description alone does not identify stroke, pushrod length, clevis, port angle, mounting, or application.

Operating Specifications and Performance

The Gold Seal is designed to provide service-brake output and reliable mechanical parking force across a broad range of commercial-vehicle applications.

Haldex subjects its actuator designs to performance and durability testing. Published Haldex actuator information describes:

SAE J1469 testing
High-temperature testing above 158 degrees Fahrenheit
Cold-temperature testing to minus 40 degrees Fahrenheit
High-pressure testing
Vibration testing
Production leak testing
Date coding for traceability

Actual output depends on:

Service-chamber size
Spring-section size
Rated stroke
Applied air pressure
Power-spring condition
Pushrod length
Clevis setting
Slack-adjuster length
Foundation-brake geometry
Brake adjustment

The chamber’s mechanical size must match the brake application. Installing a chamber with a different output or stroke can change braking torque, parking performance, and brake balance.

Braking Performance and System Integration

Gold Seal operates as one part of the complete foundation-brake system. Its output must be coordinated with the slack adjuster, camshaft, brake shoes, friction material, and drum.

Brake performance can be affected by:

Incorrect chamber size
Mismatched stroke
Improper clevis adjustment
Wrong slack-adjuster length
Pushrod misalignment
Excessive drum diameter
Worn friction material
Air-pressure differences
Damaged valves
Foundation-brake binding

Chambers installed on the same axle should normally match in size, stroke, and output characteristics. Mismatched chambers can create side-to-side brake imbalance.

Long-stroke chambers must be replaced with compatible long-stroke chambers. Using a standard-stroke unit in a long-stroke application can reduce reserve stroke and violate the approved braking configuration.

Air Supply, Controls, and Electronic Integration

The Gold Seal requires compressed air for service-brake operation and for holding the mechanical power spring in its released position.

It can operate with:

Service brake valves
Relay valves
Quick-release valves
Spring-brake relay valves
Spring-brake modulating valves
Tractor-protection valves
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 the lines can produce improper or unsafe brake operation.

ABS controls service-brake air pressure during a wheel-lock event. It does not normally release the mechanical parking spring.

Spring-brake control and modulating valves manage air entering and leaving the parking side. A failure elsewhere in the air system can therefore produce symptoms that appear to originate at the chamber.

Installation, Adjustment, and Brake Balance

The replacement Gold Seal must match the original actuator’s chamber size, stroke, pushrod, clevis, mounting, and port arrangement.

Important installation checks include:

Confirming the complete Haldex part number
Verifying chamber size
Identifying standard or long stroke
Matching the pushrod length
Confirming threaded or welded clevis
Checking mounting-stud spacing
Matching the port orientation
Confirming chamber-bracket angle
Inspecting mounting hardware
Verifying slack-adjuster length
Setting the clevis correctly
Checking pushrod alignment
Inspecting air-hose routing
Verifying suspension clearance
Measuring applied pushrod stroke
Testing service-brake operation
Testing parking-brake operation
Checking for air leakage

The pushrod should operate in line with the slack adjuster. Angular misalignment can cause binding, center-seal wear, clevis damage, and uneven brake application.

Welded-clevis chambers can reduce setup time, but the clevis position must match the exact vehicle application.

Foundation Brake, Axle, and Wheel-End Compatibility

Gold Seal is primarily designed for compatible S-cam drum-brake systems. The selected chamber must match the foundation brake and its mechanical geometry.

Compatibility depends on:

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

Common applications include Type 30/30 chambers on drive and trailer axles. Other applications use Type 24/24, 24/30, 30/36, or 36/36 configurations.

A chamber should not be substituted because it appears physically similar. Changes in size, stroke, pushrod position, or slack-adjuster geometry can alter braking performance.

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
Yard tractors
Dry van trailers
Refrigerated trailers
Flatbed trailers
Tank trailers
Dump trailers
Hopper trailers
Container chassis
Specialty commercial vehicles

Vehicle and Brake-System Compatibility

Gold Seal chambers are available across a broad range of truck and trailer applications. The correct part 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 Haldex part number
Chamber type
Rated stroke
Pushrod length
Clevis type
Mounting-stud spacing
Port orientation
Chamber bracket
Slack-adjuster length
ABS configuration
Vehicle vocation

A parts catalog or approved Haldex cross-reference should be used when the original actuator has been replaced or its identification label is damaged.

Advantages

Service, parking, and emergency braking in one assembly
Broad original-equipment application coverage
Broad aftermarket replacement coverage
Multiple chamber sizes
Standard- and long-stroke options
Corrosion-resistant power spring
Fatigue-resistant spring design
Advanced powder coating
Zinc-plated spring housing on applicable models
Double O-ring center seal
Heat- and cold-resistant diaphragms
Threaded-clevis options
Welded-clevis options
Piggyback replacement availability
Production leak testing
Established Haldex service support

Limitations or Considerations

Vented design is not fully sealed like LifeSeal+
Moisture can enter through vent openings
Drain and breather openings can become obstructed
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 varies
Spring housing contains dangerous stored energy
Parking-side housing must never be disassembled
Corrosion can develop after coating damage
Air leaks can affect brake release or application
Incorrect installation can cause brake imbalance
Warranty terms vary by model and vocation
Replacement must preserve brake-system certification

Driver and Operator Experience

A properly operating Gold Seal should provide normal service-brake response and secure parking-brake operation. The parking brakes should release when adequate air pressure reaches the spring chambers.

Drivers should report:

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

A vehicle should not be operated if a spring brake remains partially applied, leaks severely, or cannot hold the parked vehicle.

Maintenance and Ownership Notes

Inspect the chamber housing
Check for corrosion
Inspect protective coatings
Check mounting studs
Inspect mounting nuts
Check clamp bands
Inspect air ports
Check hoses and fittings
Inspect vent and breather openings
Keep drain openings clear
Inspect pushrod alignment
Check the clevis
Inspect the clevis pin
Check cotter pins
Verify slack-adjuster alignment
Measure applied pushrod stroke
Test service-brake operation
Test parking-brake application
Test parking-brake release
Listen for air leakage
Inspect the caging bolt
Install dust plugs when required
Check suspension clearance
Verify chamber identification
Never open the power-spring housing

Common Brake-System Problems

Spring brake will not release: Low system pressure, restricted air lines, a faulty parking-brake valve, frozen moisture, a damaged diaphragm, center-seal leakage, or a broken power spring may prevent release.
Spring brake releases slowly: Restricted hoses, low air delivery, contaminated valves, obstructed ports, air leakage, or internal chamber damage may delay release.
Parking brake will not hold: A weak or broken power spring, excessive brake clearance, worn linings, oversized drums, incorrect adjustment, or the wrong chamber may reduce holding force.
Service-side air leak: A damaged diaphragm, loose clamp band, corroded housing, cracked hose, loose fitting, or damaged port may cause leakage.
Air transfer between chamber sections: Worn center-seal O-rings, pushrod damage, contamination, or misalignment can allow air to move between the service and spring sides.
Chamber corrosion: Road salt, water, clogged drains, damaged coating, missing plugs, or physical damage can corrode the housing or power spring.
Blocked breather holes: Dirt, paint, corrosion, ice, or debris can interfere with normal venting and moisture drainage.
Excessive pushrod stroke: Worn friction material, oversized drums, incorrect slack-adjuster setup, worn foundation-brake components, or the wrong chamber geometry may increase stroke.
Brake dragging: Pushrod misalignment, incorrect clevis position, restricted exhaust, foundation-brake binding, or incomplete spring compression may keep the brake applied.
Uneven braking: Mismatched chambers, different strokes, unequal slack adjusters, air-pressure differences, or foundation-brake problems can cause side-to-side imbalance.

Safety and Service Precautions

The Gold Seal contains a powerful compressed spring capable of causing severe injury or death. The parking and emergency housing must never be opened, drilled, cut, welded, or disassembled.

Before servicing the chamber:

Park on a firm and level surface
Chock the wheels
Follow the approved 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 caging bolt
Inspect the caging bolt before use
Keep hands clear of the pushrod
Follow Haldex service procedures
Replace damaged hardware
Test the brakes before road operation

Caging mechanically compresses the power spring so the parking brake can be released for approved service or towing. It does not make the chamber safe to disassemble.

A severely corroded, damaged, or distorted chamber should be handled cautiously and replaced according to Haldex procedures.

Identification Information

Gold Seal identification may be found on the label, chamber housing, stroke markings, clevis, 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
Haldex part number
Gold Seal or GoldSeal+ 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
Complete or piggyback configuration

A Type 30/30 designation alone is insufficient. The correct replacement must also match stroke, pushrod length, clevis, mounting, and port orientation.

Buying Considerations

Confirm the complete Haldex part number
Verify Gold Seal or GoldSeal+ identification
Determine complete or piggyback replacement
Confirm chamber size
Identify standard or long stroke
Match the pushrod length
Confirm threaded or welded clevis
Check mounting-stud spacing
Verify port orientation
Match the chamber bracket
Confirm slack-adjuster length
Inspect hose routing
Check suspension clearance
Review the vehicle vocation
Determine whether LifeSeal+ is preferable
Check current warranty terms
Use an approved Haldex cross-reference
Replace axle pairs when appropriate
Purchase from an authorized supplier

Variants and Configurations

Type 24/24 chamber
Type 24/30 chamber
Type 30/30 chamber
Type 30/36 chamber
Type 36/36 chamber
Standard-stroke chamber
Long-stroke chamber
Standard pushrod
Threaded clevis
Welded clevis
Different pushrod lengths
Complete combination chamber
Piggyback replacement chamber
Truck configuration
Tractor configuration
Trailer configuration
Bus configuration
Vocational configuration
Heavy-duty service housing
Dust-boot configuration
Application-specific port angles

Comparison to Similar Equipment

Compared with the Bendix EverSure Spring Brake, Gold Seal uses Haldex’s own power-spring, coating, center-seal, and actuator construction. EverSure uses Bendix No Touch power-spring technology.

Compared with the Bendix EnduraSure-Pro Spring Brake, GoldSeal+ is a conventional vented spring brake. EnduraSure-Pro uses a sealed parking section and a one-way check valve to limit contamination.

Compared with Haldex LifeSeal+, GoldSeal+ relies on venting and drain openings. LifeSeal+ permanently seals the spring chamber for greater protection from moisture and contaminants.

Compared with a service-only chamber, Gold Seal combines service braking with mechanical parking and emergency-brake functions.

Compared with the Bendix SR-7 Spring Brake Modulating Valve, Gold Seal produces the mechanical force that applies the foundation brake. The SR-7 controls pneumatic pressure within the spring-brake circuit.

Compared with the Meritor Q Plus Cam Brake, Gold Seal is the brake actuator. The Q Plus is the S-cam foundation-brake assembly that receives the chamber’s pushrod force.

Best Fit For

Vehicles originally equipped with Gold Seal chambers
Current GoldSeal+ applications
Line-haul tractors
Commercial trailers
Heavy-duty straight trucks
Vocational vehicles
Dump trucks
Concrete mixers
Refuse vehicles
Commercial buses
Vehicles using Type 30/30 chambers
Standard-stroke applications
Long-stroke applications
Fleets needing broad replacement coverage
Operations using welded-clevis chambers
Maintenance programs familiar with Haldex actuators

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
Hopper trailers
Container chassis

Related Truck and Trailer Models

Related Brake System Types

Brake Systems
Air Brake Systems
Brake Chambers & Actuators
Drum Brake Systems
Trailer Brake Systems
ABS & Electronic Braking Systems
Service-brake systems
Parking-brake systems
Emergency-brake systems
Spring-brake control systems

Related Brake Products

Bendix EverSure Spring Brake
Bendix EnduraSure-Pro Spring Brake
Bendix SR-7 Spring Brake Modulating Valve
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
Commercial brake drums

Related Equipment Systems

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

Related Guides

Regulatory and Compliance Notes

The chamber must match the vehicle’s approved braking-system configuration. Chamber size, 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
Hose and fitting condition
Clevis and pin condition
Foundation-brake adjustment
Missing or damaged components

Long-stroke chambers must be replaced with compatible long-stroke chambers. A standard-stroke replacement can reduce reserve stroke and change the approved brake configuration.

A chamber that leaks, is severely corroded, is improperly mounted, or cannot apply and release correctly may place the vehicle out of service.

Real World Operating Notes

Gold Seal and GoldSeal+ are commonly used as interchangeable names, but the current product should be identified using its complete Haldex part number.

The chamber’s vent and drain openings should remain clear. Paint, undercoating, mud, corrosion, or ice can obstruct normal airflow and drainage.

A welded-clevis replacement can save installation time, but only if the clevis position and pushrod geometry match the application.

Repeated manual adjustment of an automatic slack adjuster does not repair a chamber or foundation-brake problem. Excessive pushrod stroke requires a complete brake inspection.

A caged spring brake does not provide parking or emergency application at that wheel end. The vehicle must be secured through other approved means.

For vehicles exposed to road salt, frequent washing, bulk materials, refuse, or long periods of storage, Haldex LifeSeal+ may offer greater contamination protection than a conventional Gold Seal chamber.

Frequently Asked Questions

What is the Haldex Gold Seal Spring Brake?

It is a double-diaphragm combination actuator that provides service, parking, and emergency braking on commercial vehicles.

Is Gold Seal still available?

Yes. Haldex currently markets the updated family as GoldSeal+ Combination Spring Brakes.

What is a Type 30/30 chamber?

It combines a Type 30 service chamber with a Type 30 mechanical spring section. Stroke, pushrod, mounting, and clevis must still be confirmed.

Does Gold Seal come in long-stroke versions?

Yes. Application-specific long-stroke models are available, including Type 30/30 configurations.

What is the double O-ring center seal?

It uses two O-rings around the center section to help prevent air leakage between the service and spring-brake sections.

Is Gold Seal fully sealed?

No. GoldSeal+ is a vented spring brake. Haldex LifeSeal+ is the company’s fully sealed premium design.

What happens when air pressure is lost?

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

Can the power-spring housing be opened?

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

What does caging the chamber do?

Caging mechanically compresses the power spring to release the parking brake for approved service or towing procedures.

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

No. The replacement must preserve the original chamber’s rated stroke and approved brake geometry.

Can a Gold Seal be replaced with a LifeSeal+?

An approved LifeSeal+ cross-reference may be available. Size, stroke, pushrod, clevis, mounting, and port orientation must match.

How can the correct replacement be identified?

Use the complete Haldex part number, chamber type, stroke, pushrod length, clevis, mounting dimensions, port orientation, axle, and vehicle information.

Availability and Where to Find

Haldex GoldSeal+ chambers, Gold Seal replacement components, and piggyback assemblies are available through Haldex distributors, commercial-truck dealers, trailer dealers, heavy-duty parts suppliers, fleet-maintenance providers, and brake specialists.

Availability depends on chamber size, stroke, pushrod length, clevis, mounting-stud spacing, port orientation, brake bracket, and vehicle application.

Gold Seal and LifeSeal replacement components are also supported through Haldex’s service-component catalog. Parts should be identified using the complete actuator number rather than appearance alone.

Current product information, technical documentation, parts availability, and customer support are available through the Haldex GoldSeal+ product page and Gold Seal replacement-parts section.

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