A brake booster cross reference is the most repeated technical act in this supply chain. Someone hands you a number off a core box, a quote sheet or a customer invoice, and you have to find a source that can supply the part it describes. The number matching is the easy half. The hard half is knowing what a match has actually proved, which is less than most catalogs imply. Four things have to be established before a match becomes evidence: what type of number you are holding, whether it has been superseded, which build configuration the vehicle actually is, and whether the number is a manufacturer's identity or a remanufacturer's grouping.
This is written from inside a factory that lives in these catalogs. AODA Machinery, the factory behind the AOYIDA brand, has manufactured brake boosters in Wenling, Zhejiang since 2003. Our catalog carries 2,326 cross-reference numbers, 128 of them mapped to Cardone part numbers, across 13,762 vehicle fitment records and 43 vehicle makes. If you are still building a supplier shortlist, start with our guide to finding brake booster manufacturers; if the number in front of you belongs to a hydraulic unit, read the hydro-boost sourcing guide alongside this one.
What this guide argues
- Three numbering families intersect in North American aftermarket catalogs. They are not three labels for one part, and they do not carry equal evidential weight.
- A number match is insufficient evidence until number type, supersession chain, build configuration and interchange grouping have each been checked. Which of the four is missing tells you what to do next.
- The VIN is where a fitment check starts, not where it closes. NHTSA's decoder returns what the manufacturer encoded and tells you to go to the manufacturer or the vehicle label for the rest.
- Our 2,326 cross-references and 128 Cardone mappings are compiled, publicly checkable work. Not licensed data, not a CARDONE endorsement, not a fitment guarantee.
1. The Three Numbering Families
Before you cross anything, identify what you are holding. Most bad interchanges start here, with a number of unknown type treated as if its type were obvious.
OE numbers
The reference the vehicle manufacturer assigns to the part as fitted at the factory. This is the anchor every other number points back to, and the only one issued by the party that decided what the vehicle would carry.
Two properties drive everyday work. One OE number is typically covered by many aftermarket and reman numbers, so looking outward from the OE the relationship is one-to-many. And OE numbers supersede: when a part is revised, the manufacturer issues a new number, the old one survives in search results and legacy catalogs, and a buyer who stops at the old number may conclude a part is discontinued when it has simply been renumbered.
Formats identify the issuer, which is useful when a supplier quotes a bare number. Toyota runs 44610-XXXXX. GM uses numeric strings such as 15276502. Ford uses alphanumerics like 6E5Z-2005-C. Volkswagen Group uses the 5Q1 614 106 X pattern.
Cardone numbers
This family causes the most confusion, so be precise about what it is. Cardone numbers are the internal part-numbering scheme of CARDONE Industries, founded in 1970 by Michael Cardone, Sr. and Michael Cardone, Jr. in a North Philadelphia storefront, originally rebuilding windshield wiper motors (CARDONE history).
Start by separating condition from brand. CARDONE markets both remanufactured and newly manufactured brake boosters, including 5C-series new Hydro-Boost applications. The brand name on a listing does not tell you which you are looking at. Product condition has to be read off the exact part number and its listing, and it decides whether a core charge applies and whether reman grouping logic is even relevant.
For the remanufactured lines, the process starts from a returned core: used units are disassembled, cleaned, worn components replaced, and function restored, with reverse engineering in which original design weaknesses are identified, corrected and where applicable upgraded (CARDONE, 53-5412; RockAuto spec).
The grouping behaviour described below belongs to those remanufactured lines. A single Cardone number frequently collects several OE references under one service part. The CARDONE 538814 power brake booster lists six OE interchange numbers under one code: 5Q1614106B, 5Q1614106C, 5Q1614106K, 5Q1614106L, 5Q1614106Q and 5Q1614106R (RockAuto).
That is aggregation on a remanufactured line, and aggregation runs one way. Landing on a Cardone number from any of those six OE numbers is easy. Going back the other way, from the Cardone number to the OE variant your vehicle actually needs, requires information the Cardone number does not contain.
Cardone numbers also carry package specificity that model names do not. The CARDONE 54-71050 is listed as fitting models with the JB5 GM brake code (Summit Racing). Brake code, not nameplate.
Read the prefix loosely. The 53- and 54- style prefixes denote a category inside Cardone's own scheme; treat the full number as the identifier and take fitment from the published interchange list rather than from the prefix.
One commercial characteristic belongs here too. Cores are used parts returned to the remanufacturer instead of being scrapped (CARDONE), which means core deposits and return logistics sit inside the landed cost of any reman program. That affects your margin, not your fitment.
Aftermarket numbers
Every independent manufacturer assigns its own numbers to its own production. These map to OE in many-to-many relationships: one OE number covered by a dozen brands, one aftermarket number sometimes covering several OE numbers where the supplier consolidated applications.
This is the layer our own catalog occupies. An AOYIDA part number is an aftermarket number carrying a published set of OE cross-references and vehicle applications. It is worth exactly as much as the cross-reference data behind it. A part number published with no OE references and no fitment list is a label, not a cross-reference.
When a buyer sends you a Brand X number and you need Brand Y, you translate through the OE number. The OE number is the common key. Everything else is a dialect.
Side by side
| Attribute | OE number | Cardone number | Aftermarket number |
|---|---|---|---|
| Who assigns it | The vehicle manufacturer | CARDONE Industries, a remanufacturer | Each independent supplier |
| What it identifies | The part fitted at the factory | A CARDONE service part. Condition (new or remanufactured) must be read from the specific number and listing | A specific supplier's production part |
| Relationship to OE | Is the OE reference | Reman lines group several OE numbers under one code | Many-to-many |
| Gets superseded | Yes | Yes, groupings get revised | Yes |
| Evidential weight | Highest, when confirmed against build data | Corroborating | Corroborating |
| Core return | No | Depends on the exact product condition and listing | No |
2. Default Evidence Priority for Application Identification
Not all confirmations are worth the same. This is the part most cross-reference guides skip, and it is the part that decides whether your process actually converges on the right part or just accumulates agreeing catalogs.
One scoping note before the list. What follows ranks evidence for which part the vehicle takes. Physical conformance of what actually gets delivered is a parallel approval question, governed by the controlled drawing, the written specification and the approved sample, and it does not sit under the catalog evidence above it.
For identification, rank your evidence like this:
- OEM electronic parts catalog and supersession data. The manufacturer's own record of what the vehicle carried and what supersedes it.
- Vehicle build data: option codes, RPO or PR codes, brake code, production date. What that specific unit was actually assembled with.
- The physical part and an approved drawing. Measured, not described.
- A supplier's controlled fitment record. Structured data the supplier maintains and can be held to.
- Aftermarket and reman interchange. Useful corroboration. Not proof.
The trap in the middle of that list is worth naming. Two catalogs agreeing is not two pieces of evidence if both bought their data from the same aggregator, copied an older catalog, or inherited the same error. Independent confirmation means independent origin, and most online parts data is less independent than it looks. When two sources agree, ask where each got it before you count the agreement.
For every mapping you rely on commercially, record four things: the source, the date you retrieved it, the revision it belongs to, and how confident you are. That record is what lets you re-audit a bad shipment instead of re-deriving the whole chain from memory.
Where the VIN sits
The VIN belongs at the top of the workflow and nowhere near the bottom of the evidence stack. It is the entry point that tells you which vehicle you are talking about, and it is routinely oversold as though it returned a complete build sheet.
NHTSA's own decoder is explicit about its limits. The information it displays is reported by the manufacturer, and for further questions the site directs you to contact the vehicle manufacturer, adding that more information may be available on a label affixed to the vehicle (NHTSA vPIC). A general decoder is not an OEM parts catalog. Brake packages, GVWR variants, RPO and PR codes, mid-year production breaks and master-cylinder interface differences frequently are not in it.
So: decode the VIN to identify the vehicle, then take the configuration question to OEM parts data, the build label, or the manufacturer. Treating the decode as the answer is how a buyer ends up confidently ordering the wrong brake package.
3. Where Number Matching Breaks
Five recurring failure patterns show up in this category. None of them means the numbering systems are broken. All of them mean a step was skipped.
The transposed digit
A part number is a character string and a single flip lands you on a different part. 44610-16300 is not 44610-13600. A tired transcription or a smudged casting is enough.
Read the number back. Confirm it against a second physical source: the part itself, the original invoice, a decode. Never place a production order from one handwritten transcription.
The ignored supersession
The old number persists in search results and legacy catalogs while current production carries a new code. A buyer who searches the obsolete number and concludes the part is discontinued has missed a supersession, and one who quotes against it is quoting a part nobody builds any more. Follow the chain to the current number before you decide anything about availability.
The grouped reman number used to buy new
Where a remanufactured Cardone number collects several OE references under one service part, it identifies a reman service decision rather than a manufacturer's part identity. That decision belongs to the remanufacturer and applies to their unit.
Take that same Cardone number to a different supplier for a new part and the grouping does not travel with it. The new supplier may not consolidate the same variants, or may consolidate a different set. Resolve the Cardone number down to the specific OE number your configuration needs before ordering new stock. Skipping that step is one common way a correct-looking interchange produces a wrong box.
The brake-package variant
A model name is not a brake specification. A pickup sold under one name across several model years may have carried two or three engines, multiple cab configurations and distinct brake packages, and the booster follows the brake code rather than the nameplate. The CARDONE 54-71050 is specified against the JB5 GM brake code for exactly this reason (Summit Racing).
Ordering "a Silverado booster" leaves fitment to chance. Require the brake package or RPO code on any platform known to have variants.
The casting number read as a service number
Boosters carry stamped and cast marks, and not all of them are OE part numbers. Some identify the raw casting, the tooling or an internal foundry code and appear in no interchange catalog anywhere. Cardone's own guidance points at the layering: most boosters carry a pedal rod identification number stamped on the rod, separate from anything on the shell (CARDONE).
When a number's identity is uncertain, establish which family it belongs to before you cross it. A number you cannot classify is not evidence.
4. What Varies Physically Under a Matching Number
The reason a checked interchange still needs a dimensional confirmation is that an application is a range of vehicles, not one object. Four dimensions do most of the damage.
Pushrod length is the quiet one. The rod connects the booster to the pedal on the input side and to the master cylinder on the output side, and a few millimetres changes pedal free play, master cylinder preload and brake-light switch release. Wrong length and the brakes drag, the pedal sits low, or the stop lamps stay on. Owner-community documentation for the C3 Corvette records the pattern clearly: the 1977-1982 booster uses a shorter master-cylinder pushrod for a shallower bore, while the 1968-1976 unit uses a longer rod for a deeper one (Corvette Forum). That is a community source rather than an OEM manual, and it is cited here as an illustration of a documented production break, not as a specification.
Firewall stud pattern varies by platform and brake package. Dimensionally perfect everywhere else and wrong on the stud spread means drilling, which is not acceptable on a safety part in a wholesale replacement context.
Diaphragm configuration separates single-diaphragm units from dual-diaphragm units that stack two smaller diaphragms to reach a higher assist ratio in a shorter package. Different envelope, different ratio, not interchangeable.
Production-date breaks put two vehicles of the same year, make and model on different components depending on build date. When an interchange lands near a known transition, ask the supplier directly whether the unit covers the full year range or whether there is a date break. A supplier with engineering depth will know without checking.
5. The Confirmation Workflow
| Step | What you do | What it rules out |
|---|---|---|
| 1. Classify | Establish which family the number belongs to, and where it came from | Crossing a casting number, or treating a reman grouping as a manufacturer identity |
| 2. Identify the vehicle | Decode the VIN, then take configuration to OEM data, the build label or the manufacturer | Ordering against a model name that conceals several brake packages |
| 3. Resolve to OE | Follow the supersession chain to the current OE number for that exact configuration | Quoting an obsolete number, or buying a grouped number without knowing which variant applies |
| 4. Corroborate | Check against a second, genuinely independent numbering system | Trusting a single catalog entry that may carry an inherited error |
| 5. Confirm dimensions | Pushrod lengths, stud pattern, master-cylinder interface, diaphragm configuration, port orientation | The wrong-part return that survives a correct number |
On a first order with a new supplier, add one more: request a first-article dimension report measured against your retained sample, before the production run rather than after the container lands.
Want to test a supplier's rigour cheaply? Send a number and watch what comes back. Submit an OE or Cardone number through our RFQ page and we return the cross-reference, the vehicle application and the dimensions that have to match, before any quote.
6. What Our Data Covers, and What It Does Not
Our catalog spans 566 product pages across four lines: 401 vacuum boosters, 104 master cylinders, 52 hydraulic boosters and 9 clutch boosters. Across them we maintain 2,326 cross-reference numbers, 128 mapped to CARDONE part numbers, covering 13,762 vehicle fitment records across 43 vehicle makes.
| Data point | Count |
|---|---|
| Cross-reference numbers | 2,326 |
| Mapped to Cardone part numbers | 128 |
| Vehicle fitment records | 13,762 |
| Vehicle makes covered | 43 |
| Vacuum booster SKUs | 401 |
| Master cylinder SKUs | 104 |
| Hydraulic booster SKUs | 52 |
| Clutch booster SKUs | 9 |
| Product pages | 566 |
Send an OE number and we confirm whether it falls inside mapped coverage and return the applications and crosses on file. Send a Cardone number and we check the 128 mappings and tell you whether we build the corresponding unit. Send a vehicle and we run it against the fitment records before quoting.
Now the limits, stated plainly, because misrepresenting a cross-reference database is a fast way to lose a buyer.
It is compiled work, not licensed data. We built these relationships over years of catalog work and maintain them as products change. Every one can be checked against OE manufacturer catalogs, against CARDONE's published interchange lists, and against independent parts databases. That checkability is the whole value.
It is not authorized or endorsed. We are not a CARDONE-authorized distributor. The 128 Cardone-to-OE mappings carry no CARDONE endorsement, authorization or partnership. CARDONE owns its part numbers and its interchange data; we map to them as a third party, the same as any catalog does.
It is not a fitment guarantee. A cross-reference says two numbers describe the same application family. Sections 4 and 5 are what close the gap between that and a part that fits. Any supplier implying their cross-reference depth is itself proof of fitment is making a marketing claim.
It is not complete and the counts move. Catalogs shift, numbers supersede, applications get added. The figures above are current as of the date on this article. Use them to benchmark data depth, not as a fixed promise.
Browse the coverage across the vacuum boosters range, the master cylinders range or the full catalog. For how we verify the factory behind the data, see the factory verification guide.
7. Related Guides
- Finding suppliers: searching by OE number, filtering candidates.
- The full sourcing workflow: eight stages from specification to pre-shipment inspection. Cross-referencing plugs into Stage 1 and Stage 5.
- Hydro-boost units: hydraulic boosters carry interface requirements vacuum units do not.
- OEM / ODM and private label: part-numbering and revision control under your own brand.
Conclusion: Classify, Then Confirm
Interchanges fail because a match gets treated as a conclusion. The number was never the conclusion. It is one input, and it only becomes evidence once you know what family it belongs to, whether it has superseded, which configuration the vehicle actually is, and whether you are looking at a manufacturer's identity or a remanufacturer's grouping.
Buyers who run this well classify the number first, use the VIN to identify the vehicle and OEM data to pin the configuration, resolve to a current OE number, corroborate against a genuinely independent source, and confirm the dimensions that survive a correct number. That sequence retires all five traps in Section 3.
Pull the number off the part in front of you, get the VIN, and send both. We will return the cross-reference, the vehicle application, and the dimensions that must match. Browse the catalog and send your numbers, or go straight to the RFQ page.
FAQ
What is the difference between an OE number and a Cardone number on a brake booster? An OE number is the reference the vehicle manufacturer assigns to the part as fitted at the factory, and it is the anchor every other number cross-references back to. A Cardone number is the internal part number of CARDONE Industries, founded in 1970. Read condition before anything else: CARDONE markets both remanufactured boosters and newly manufactured ones, including 5C-series new Hydro-Boost applications, so the brand name alone does not tell you whether a unit is new or reman, or whether a core charge applies. On the remanufactured lines a single Cardone number frequently groups several OE numbers under one service part, because those variants were consolidated into one interchangeable rebuild. That grouping is a remanufacturer's service decision rather than a manufacturer's part identity, and it does not transfer to another supplier's new part.
Why does my brake booster cross reference match but the part does not fit? A match confirms two numbers describe the same application family. It does not confirm the physical part suits your specific build. Usually one of four checks was skipped: the number type was never established, a supersession was missed, the build configuration was never pinned down beyond a model name, or a grouped remanufacturer number was used to buy a new part without resolving it to the specific OE variant. Physically, the differences that bite are pushrod length, firewall stud pattern, diaphragm configuration, and production-date breaks within a single model year.
How do I confirm a brake booster interchange before ordering? Five steps. Classify the number and record where it came from. Decode the VIN to identify the vehicle, then take the configuration question to OEM parts data, the build label or the manufacturer, because a general VIN decoder returns only what the manufacturer encoded. Resolve your number to the current OE number for that configuration, following any supersession chain. Corroborate against a second numbering system whose data has a genuinely independent origin. Then confirm the dimensions: pushrod lengths, stud pattern, master-cylinder interface, diaphragm configuration and port orientation. On a first order with a new supplier, add a first-article dimension report measured against your retained sample.
Are the Cardone numbers in your cross-reference database official Cardone data? No. The 128 Cardone-to-OE mappings in our catalog are our own compiled cross-reference work, built from publicly available catalog data. We are not a CARDONE-authorized distributor, and these mappings carry no CARDONE endorsement, authorization or partnership. They are transparent, checkable relationships that help buyers translate between numbering systems, and every one can be verified against CARDONE's published interchange lists and OE manufacturer catalogs.