Have a brake chamber number but not a complete product label? Start with the cross-reference number, then confirm the chamber type, stroke, pushrod, mounting pattern, ports, and clevis before ordering. Brake chambers can look nearly identical while using different installation dimensions.

Common brake chamber cross-references

The table below lists common part numbers currently associated with GBK brake chamber products. These numbers identify possible replacement options; they do not replace a complete fitment check.

Service chamber or spring brake?

A service chamber uses air pressure for normal braking. A spring brake chamber combines a service section with a mechanical parking and emergency section. A number such as 30/30 describes the two chamber sections, but it does not identify every mounting and pushrod detail.

What must match before installation

• Chamber type and size: Type 20, Type 24, Type 30, or Type 30/30
• Stroke: standard stroke or long stroke
• Pushrod: overall length, threaded length, thread size, and required cut length
• Mounting: stud spacing, stud threads, and installation angle
• Air ports: size, shape, orientation, and clearance
• Clevis: detachable, welded, included, or reused from the original installation
• Spring-brake details: sealed construction, caging bolt, and parking-side clearance

Do not select a chamber using only the type number. Two Type 30 or Type 30/30 chambers may differ in stroke, pushrod, ports, or mounting.

How to search a worn or partial part number

1. Search the complete number exactly as printed.
2. Try the number without spaces, hyphens, or punctuation.
3. Confirm whether the original component is a service chamber or a spring brake.
4. Measure the stroke, pushrod, mounting-stud spacing, and port arrangement.
5. Compare those measurements with the GBK product specifications before ordering.

Browse GBK brake chambers, or use the Bendix, Haldex, Meritor, MGM, and Automann cross-reference pages.

Contact a GBK parts specialist when the label is damaged or the pushrod and mounting configuration cannot be confirmed.

Cross-reference numbers identify possible compatible replacement options. Buyers and installers must verify the complete specifications and application before installation. Spring brake chambers contain a powerful mechanical spring and must be handled using the correct service procedure.

Have a Webb Wheel number from a brake drum or trailer hub? Use it to identify a possible GBK replacement, then compare the dimensions that control fitment. Brake drums and hubs should never be selected from the brand number alone.

Common Webb numbers and GBK replacement options

What has to match on a brake drum

• Brake size: nominal braking diameter and shoe width
• Mounting: inboard or outboard drum design
• Bolt pattern: hole count, bolt circle, and hole diameter
• Pilot: pilot diameter and hub-piloted fit
• Geometry: offset, flange thickness, overall depth, and clearance
• Application: axle rating, material or weight class, and compatible hub

What has to match on a trailer hub

• Axle and spindle application
• Stud count, stud size, and bolt circle
• Inboard or outboard drum configuration
• Inner and outer bearing cups
• Wheel seal and lubrication system
• ABS tone-ring or sensor provisions when required
• Hub material, weight, and service application

A matching Webb number is a useful starting point, but verify the casting, dimensions, bearings, seal, studs, and drum configuration before installation.

Search the Webb cross-reference page, or browse GBK brake drums and hub assemblies.

Send GBK the Webb number, axle information, and product photos when the hub or drum configuration is unclear.

Webb Wheel and related marks belong to their respective owners. GBK is an independent aftermarket supplier and is not affiliated with, sponsored by, or endorsed by Webb Wheel. Part numbers are used for identification and cross-reference purposes only.

Have a Webb Wheel number from a brake drum or trailer hub? Use it to identify a possible GBK replacement, then compare the dimensions that control fitment. Brake drums and hubs should never be selected from the brand number alone.

Common Webb numbers and GBK replacement options

What has to match on a brake drum

• Brake size: nominal braking diameter and shoe width
• Mounting: inboard or outboard drum design
• Bolt pattern: hole count, bolt circle, and hole diameter
• Pilot: pilot diameter and hub-piloted fit
• Geometry: offset, flange thickness, overall depth, and clearance
• Application: axle rating, material or weight class, and compatible hub

What has to match on a trailer hub

• Axle and spindle application
• Stud count, stud size, and bolt circle
• Inboard or outboard drum configuration
• Inner and outer bearing cups
• Wheel seal and lubrication system
• ABS tone-ring or sensor provisions when required
• Hub material, weight, and service application

A matching Webb number is a useful starting point, but verify the casting, dimensions, bearings, seal, studs, and drum configuration before installation.

Search the Webb cross-reference page, or browse GBK brake drums and hub assemblies.

Send GBK the Webb number, axle information, and product photos when the hub or drum configuration is unclear.

Webb Wheel and related marks belong to their respective owners. GBK is an independent aftermarket supplier and is not affiliated with, sponsored by, or endorsed by Webb Wheel. Part numbers are used for identification and cross-reference purposes only.

Replacing a Haldex brake chamber starts with the number on the can, but the number alone is not enough to confirm installation. Service chambers and spring brakes must also match the stroke, pushrod, mounting studs, ports, clevis, and available clearance.

Common Haldex brake chamber cross-references

SC-series and GC-series numbers

Haldex SC-series numbers identify service chambers, while GC-series numbers commonly identify combination spring brake chambers. The family name helps identify the component, but it does not confirm every dimension or installation detail.

Standard stroke and long stroke are not interchangeable labels

A Type 30/30 chamber may be offered in regular-stroke and long-stroke configurations. Match the stroke shown on the original chamber and verify the pushrod and port arrangement. Do not choose a replacement solely because both products are labeled 30/30.

What to measure when the label is unreadable

• Service chamber or combination spring brake
• Chamber size
• Applied stroke or long-stroke marking
• Pushrod overall and threaded length
• Mounting-stud spacing and threads
• Air-port size, position, and orientation
• Clevis type and installation length
• Clearance around the axle, suspension, and caging bolt

Search the Haldex cross-reference page, or browse GBK brake chambers and brake shoes.

Send GBK the complete Haldex number and product measurements if the chamber configuration cannot be confirmed.

Haldex and related marks belong to their respective owners. GBK is an independent aftermarket supplier and is not affiliated with, sponsored by, or endorsed by Haldex. Part numbers are used for identification and cross-reference purposes only.

Replacing JOST landing gear requires more than matching the A400-series name. The mount position, travel, backboard, leg dimensions, crank arrangement, gearbox, and capacity all need to match the trailer installation.

JOST landing gear cross-reference table

The key difference: inside mount or outside mount

The A400.T.17 and A401.T.17 references are not interchangeable labels. The mounting position changes how the landing gear attaches to the trailer structure. Confirm whether the existing set is inside mount or outside mount before ordering.

What to verify before replacing landing gear

• Mount type: inside mount or outside mount
• Backboard: hole count, spacing, width, and mounting surface
• Travel: extension and retraction range
• Leg dimensions: retracted height, extended height, and left/right configuration
• Crank and gearbox: crank side, shaft position, two-speed gearbox, and cross-shaft alignment
• Feet: sand shoe or other foot configuration
• Capacity: lift and static capacity required for the trailer
• Installation clearance: frame, cross-member, handle, and nearby equipment

Why the full trailer installation still matters

A cross-reference number identifies the intended landing gear family, but trailers can have different brackets, cross-shafts, crank arrangements, and clearances. Compare the existing set and installation measurements before removing or ordering the replacement.

Browse GBK landing gear, or search the JOST cross-reference page.

Contact GBK with the JOST number and mounting photos when the mount position, backboard, or crank configuration is unclear. For fleet quantities, request wholesale pricing.

JOST and related marks belong to their respective owners. GBK is an independent aftermarket supplier and is not affiliated with, sponsored by, or endorsed by JOST. Part numbers are used for identification and cross-reference purposes only.

Meritor numbers appear across foundation brakes, air-system components, wheel-end parts, and automatic slack adjusters. A part number is the fastest starting point, but the replacement still needs to match the component type and its complete technical configuration.

Common Meritor numbers and GBK replacement options

Match the specification that controls fitment

Different Meritor component families require different checks:

• Brake chambers: type, stroke, pushrod length, mounting, ports, and clevis
• Air dryers: model family, heater voltage, port locations, pressure setting, purge valve, and bracket
• Slack adjusters: arm length, spline count, spline diameter, offset, and adjustment system
• Brake shoes: FMSI family, brake size, lining rating, axle position, and hardware
• Brake drums: brake size, pilot, bolt circle, bolt-hole count, offset, flange, and weight class

Why an FMSI number is not the only brake-shoe check

An FMSI number helps identify shoe geometry, but the complete replacement should also match the brake size, lining specification, axle rating, axle position, and included hardware. Do not assume every product carrying the same base FMSI family is identical.

Air dryer bracket and configuration differences

The same basic dryer application may be available as a bracketed or no-bracket assembly. For example, a no-bracket replacement may be appropriate only when the existing mounting bracket can be reused and the ports, voltage, and dimensions match.

Search the Meritor cross-reference page, or browse brake chambers, air dryers, slack adjusters, brake shoes, and brake drums.

Contact GBK with the full Meritor number and original-part photos when the product family or configuration is unclear.

Meritor, WABCO, and related marks belong to their respective owners. GBK is an independent aftermarket supplier and is not affiliated with, sponsored by, or endorsed by those companies. Part numbers are used for identification and cross-reference purposes only.

Have a Bendix air brake part number and need a replacement option? The number can narrow the search quickly, but the component family and full configuration still need to match. This guide covers Bendix numbers currently associated with GBK air dryers, purge valves, brake chambers, spring brakes, and an automatic slack adjuster.

Bendix air dryer and purge valve cross-references

Bendix brake chamber and slack adjuster cross-references

Repair the dryer or replace the assembly?

A purge valve or service kit may be appropriate when the dryer housing, heater circuit, ports, and mounting remain serviceable and the failure has been correctly diagnosed. A complete assembly may be more appropriate when the housing, heater, manifold, ports, or mounting are damaged or incompatible.

Do not order a repair kit solely because the dryer family name looks familiar. Confirm the complete Bendix number and the valve or heater configuration first.

What to verify before ordering

• Air dryers: dryer family, heater voltage and wattage, ports, pressure setting, purge configuration, and bracket inclusion
• Brake chambers: chamber type, stroke, pushrod, clevis, mounting pattern, and air-port position
• Slack adjusters: arm length, spline count, spline diameter, offset, mounting, and adjustment system

Search the Bendix cross-reference page, or browse air dryers, repair kits, brake chambers, and slack adjusters.

Send the complete Bendix number to GBK when the bracket, ports, pushrod, or mounting configuration is unclear.

Bendix and related marks belong to their respective owners. GBK is an independent aftermarket supplier and is not affiliated with, sponsored by, or endorsed by Bendix. Part numbers are used for identification and cross-reference purposes only.

A trailer hub assembly has to match the spindle, bearings, seal, studs, wheel pattern, drum mounting, lubrication system, and axle application. A cross-reference number is useful, but a hub should never be ordered from the casting number alone.

Common trailer hub cross-references

What makes a hub assembly fit

• Spindle and axle: the hub must match the axle and spindle family
• Bearings: inner and outer bearing or cup numbers must be correct
• Seal: seal diameter, design, and lubrication compatibility must match
• Studs: quantity, thread, length, and bolt circle must match the wheel
• Drum mounting: confirm inboard or outboard drum design and drum pilot
• ABS: verify tone-ring and sensor provisions when required
• Lubrication: use the approved oil or grease system and compatible hub cap

Pre-assembled does not mean universal

A pre-assembled hub can reduce installation steps when the included bearing cups, studs, and related components match the axle. It does not eliminate the need to verify the spindle, seal, bearing set, wheel pattern, drum configuration, and ABS requirements.

Warning signs at the wheel end

Investigate a wheel end that shows lubricant leakage, contamination, abnormal heat, noise, looseness, damaged studs, metal debris, or repeated seal failure. The source may be a bearing, seal, spindle, hub, fastener, lubrication, or installation problem rather than the hub casting alone.

What to record before removing the original hub

1. Hub casting or assembly number
2. Axle and spindle identification
3. Inner and outer bearing or cup numbers
4. Seal number and measured seal surfaces
5. Stud count, thread, and bolt circle
6. Inboard or outboard drum configuration
7. ABS tone-ring and sensor arrangement
8. Lubricant type and hub-cap style

Browse GBK hub assemblies, brake drums, and related hub cover kits.

Send GBK the hub number, axle information, bearing numbers, seal number, and photos when the wheel-end configuration is unclear.

Cross-reference numbers identify possible replacement options. Buyers and installers must verify the axle, spindle, bearing, seal, stud, wheel, drum, lubrication, and ABS configuration before installation.

Brake shoes and drums wear together, but they are not matched by brand name alone. A part number or FMSI number can narrow the search, while the brake size, shoe family, lining specification, drum pilot, bolt pattern, offset, and axle application determine whether the replacement is suitable.

Common brake shoe cross-references

The following numbers are currently associated with GBK brake shoe products. Use them as replacement-search references, then confirm the complete brake specification before ordering.

Common brake drum cross-references

An FMSI number is a starting point, not the complete specification

The base FMSI family helps identify shoe geometry, but products within or around the same family can differ by brake system, lining rating, axle position, rivet pattern, hardware, and intended application. Match the full product description rather than relying on the three- or four-digit family number alone.

What to inspect before replacing brake shoes

• Brake system: Meritor Q, Q Plus, Eaton ES, ES II, or another design
• Brake size: drum diameter and shoe width
• Axle position: front, rear, drive, or trailer application
• Rating: lining and axle-rating requirements
• Hardware: rollers, springs, pins, anchors, and included repair kit
• Condition: lining wear, cracks, contamination, glazing, and uneven wear

What to verify before ordering a brake drum

• Nominal brake diameter and shoe width
• Inboard or outboard mounting design
• Pilot diameter
• Bolt-hole count, hole diameter, and bolt circle
• Overall depth, offset, and flange dimensions
• Drum material and weight class
• Axle, hub, and GAWR application
• Maximum service diameter stamped on the original or specified by the manufacturer

Replace a drum when it is cracked, damaged, contaminated beyond service, or outside the applicable manufacturer service limits. Do not machine or reuse a drum beyond its marked limits.

Browse GBK brake shoes, brake drums, and brake repair kits.

Send GBK the FMSI number, drum number, axle information, and measurements when the brake family or dimensions cannot be confirmed.

Cross-reference numbers identify possible replacement options. Buyers and installers must verify brake size, system family, lining or drum specification, hardware, axle application, and all critical dimensions before installation.

Have an Automann part number and need a compatible replacement? This guide covers common Automann numbers that cross-reference to products currently listed in the GBK catalog, including brake chambers, air dryers, purge valves, brake drums, hub assemblies, repair kits, and brake shoes.

A cross-reference number is a starting point, not a fitment guarantee. Before ordering, compare the complete product type, dimensions, mounting pattern, ports, stroke, pushrod, clevis, hardware, voltage, and intended vehicle or trailer application.

Automann brake chamber cross references

PAT-24 configuration notice: The previous GBK data listed Automann 170.K058691, which has been removed because it is not a valid confirmed Automann brake-chamber reference. Public listings for the Bendix K058691 and MGM 1427901 family commonly point to Automann 179.M1427901 or 179.SC24XLW225, but those configurations are often shown with a welded clevis or yoke. The GBK PAT-24 uses a threaded pushrod and detachable clevis, so it should not be presented as a confirmed Automann replacement until the complete factory drawing is verified.

Automann air dryer and purge valve cross references

No-bracket AD-9 warning: GBK GAD065225 is a no-bracket air dryer and should not be described as the same complete assembly as Automann 170.065225. It may be a suitable replacement option only when the existing bracket can be reused and all ports, voltage, purge-valve configuration, and mounting dimensions match.

Automann brake drum, hub, and repair kit cross references

Automann brake shoe cross references

Brake shoes should be matched by FMSI geometry, brake size, lining rating, shoe style, and included hardware. The following GBK 23K shoe kits now include verified Automann references in the catalog data.

How to verify an Automann replacement

1. Search the complete number. Keep periods, letters, and suffixes because they may identify stroke, style, voltage, or lining rating.
2. Confirm the product family. Make sure a service chamber is not being confused with a spring brake, or a Bendix dryer family with a WABCO/Meritor dryer family.
3. Compare every critical specification. Check physical dimensions, ports, mounting, voltage, stroke, pushrod, clevis, pilot, bolt circle, bearing set, or FMSI geometry as applicable.
4. Review what is included. A complete assembly may include a bracket, clevis, hardware, purge valve, bearing cups, or repair components that a base replacement does not include.
5. Confirm the application. Use the truck, trailer, axle, brake, or dryer model information before installation.

Browse the Automann cross-reference page, brake chambers, air dryers, brake drums, and brake shoes to compare available GBK options.

Need help matching a parts list?

Send the complete Automann numbers, photos of the original labels, vehicle or trailer information, and the relevant measurements. The GBK parts team can review the cross-reference, check availability, and help with fleet or distributor quantities.

Contact a GBK parts specialist or request fleet and wholesale pricing.

Automann and related marks are the property of their respective owners. GBK is an independent aftermarket supplier and is not affiliated with, sponsored by, or endorsed by Automann. Manufacturer names and part numbers are used for identification and cross-reference purposes only. Buyers and installers must verify product specifications and application before installation.

You pull a brake chamber off a drive axle, wipe it down, and the only marking left is half a part number. Now what? Brake chambers look interchangeable until you put the wrong one on — so before you order anything, it helps to know the four things that actually decide fitment.

Service, spring, or piggyback

A plain service chamber (a Type 20 or 24, say) handles normal braking on a steer or drive axle. A spring brake — the “piggyback” can you see on drive and trailer axles — adds a parking/emergency section behind the service chamber and carries two numbers, like a 30/30. Mixing these up is the most common ordering mistake, so figure out which one you’re holding first.

Reading the size and stroke

The “type” number is just the diaphragm’s effective area in square inches — bigger number, more clamping force. A 30 pushes harder than a 24. Stroke is how far the pushrod travels before the brake’s out of adjustment, and it comes in standard (~2.5″) and long-stroke (~3″). Long-stroke chambers are marked, and you never mix stroke types on the same axle.

Cross-referencing the brands

Once you know the type, the service/spring setup, the stroke, and the port/mount layout, the chamber’s interchangeable no matter whose name is stamped on it. That’s the whole trick — the brand number is shorthand for that spec. GBK chambers cross-reference the common ones, and you can find your number on a brand page: Bendix, Haldex, MGM, or Automann.

Every GBK chamber lists its full “This Part Replaces” table, so you can confirm the match before you buy. Browse brake chambers, or if your number’s worn off, tell us the axle and what came off and we’ll sort it out.

One safety note worth repeating: a spring brake stores a serious amount of force. Never crack one open without caging the spring first.