This guide is for distributors reviewing catalog data, supplier documents and marking photographs. It supplies no universal wear limit, machining allowance or service approval. A workshop decision requires the applicable vehicle and disc instructions and the relevant inspection record. The distributor's task is to provide accurate, traceable information without turning incomplete data into a technical conclusion.
Begin with a complete disc identity
Record the full requested reference, including suffixes, and the application information that selects the correct variant. Keep the relevant axle or position information with the item rather than relying on the vehicle model name alone. A catalog record for a different brake configuration is not a substitute for the selected reference.
When a supplier offers an alternative, ask for the specific evidence connecting the offered disc to the requested application. Minimum thickness is one data field, not an interchange rule. Equal values in that field cannot establish that two discs have the same geometry, mounting arrangement or intended application.
Retain the source record as received before reformatting it into your catalog. That makes later discrepancies easier to examine. A shortened reference or missing unit can arise during data entry even when the original source was clear, so preserve the original alongside the normalized entry.
Give new thickness and minimum thickness separate fields
Use distinct, named columns in the item master. Do not place both values under an ambiguous heading such as “thickness.” The reader needs to know which quantity each value describes, and the source should define that quantity for the exact selected disc.
For a bounded example, Brembo’s catalog entry for disc 08.5177.20 lists thickness (TH) as 16 mm and minimum thickness as 13 mm. These are two different named fields for that manufacturer reference, read on 4 October 2026. Their useful role here is to show how a catalog distinguishes quantities; neither number is a MAKEXCAR specification. Do not interpret the difference as a machining allowance or remaining service life.
Keep the value and its unit together when importing or exporting data. Preserve source precision rather than adding decimal places that were not supplied. If your system converts units, retain the original value and document the conversion so a reviewer can recover the source statement.
Read a physical marking as a source record
Brembo's minimum-thickness guidance explains the MIN TH designation and comparison with the indicated disc value. Use the relevant manufacturer's selected-item guidance when interpreting a specific specimen. This background does not establish the required marking format or wear limit for every disc brand.
Request a clear photograph showing the marking and enough surrounding context to identify the photographed object. Keep the specimen or sample reference attached to the photograph. A close-up of digits without object identity is weaker evidence than an image linked to a known sample and its accompanying documents.
Transcribe the visible text exactly. If a character is obscured or the unit cannot be read, record that uncertainty and request better evidence. Do not fill in the missing text from a similar rotor. Equally, do not convert an unreadable marking into a claim that the disc has no applicable limit.
Reconcile the marking with the selected catalog entry
Place the physical marking record beside the relevant supplier document and your catalog fields. Check that the identities refer to the same offered item before comparing the thickness information. This avoids treating a packaging label, a stock photograph and a drawing for different variants as one consistent evidence set.
If the values or wording disagree, keep both source statements visible. Ask the supplier to explain the discrepancy with a corrected or clarified reference-specific document. A distributor should not choose whichever figure makes the listing look more favorable or simply overwrite one statement without retaining the reason.
Record the response, its date and the document revision accepted for catalog use. If the response changes the selected reference, review the remaining item fields as well. Resolving a thickness discrepancy does not automatically resolve every question about fitment or the sales unit.
Use a compact evidence table
The following worksheet is an original catalog-review tool. It separates the source, the observed specimen and the imported record. It contains no default numerical limit or instruction for measuring a disc. Fill the entries from actual selected-item documents and retain the unresolved items for follow-up.
| Review field | Evidence to retain | Question when unclear |
|---|---|---|
| Identity | Full reference and application context | Do all records identify the same variant? |
| New thickness | Named source field and unit | Is this distinct from the minimum field? |
| Minimum thickness | Selected-item statement and document version | Which source defines the value? |
| Marking | Exact transcription and specimen-linked photo | Are the characters and unit legible? |
| Data transfer | Original and imported entries | Was precision,unit or row identity changed? |
| Discrepancy | Supplier clarification and accepted revision | What remains unresolved? |
A checked worksheet indicates that the catalog evidence has been reviewed. It does not certify a specimen for use, approve machining or replace a workshop's condition assessment. Keep the purpose of the record visible when sharing it with colleagues or customers.
Keep measurements separate from specifications
A measured thickness is an observation about a particular specimen under a particular inspection method. A catalog specification is a statement about the selected item. Preserve those as separate records rather than replacing the minimum-thickness field with a measurement from one sample.
If a customer supplies a measurement report, request the specimen identity and the method or instructions used. Keep those details with the report for technical review. This guide does not prescribe measuring positions, instruments or acceptance rules, because those require the applicable manufacturer and vehicle instructions.
Do not infer remaining service life from a photograph or a single catalog comparison. Likewise, thickness alone is not a complete inspection record. If a service decision is being requested, route the identified part and relevant observations to a qualified reviewer using the applicable service documentation.
A mismatch scenario during catalog import
Consider a hypothetical distributor importing a supplier spreadsheet. The new-thickness field enters correctly, but the minimum-thickness value is copied from the preceding row. Later, a sample photograph appears inconsistent with the distributor listing. The issue should be treated as an identity and data-transfer investigation, not immediately as a manufacturing defect.
The reviewer compares the original spreadsheet, the imported record and the specimen-linked photograph. The supplier is asked to confirm the selected reference and the correct source fields. If the import caused the mismatch, the distributor corrects the catalog entry and records the reason. If the source itself remains inconsistent, the unresolved entry stays open for supplier clarification.
This scenario illustrates why source records matter. It does not describe an actual complaint or approve any physical disc. A corrected catalog value resolves a data error; it cannot by itself establish the condition or suitability of a customer's existing brake components.
Publish the field with its evidence boundary
Customer-facing catalogs should use clear labels and units and retain the exact reference relationship. Avoid broad phrases such as “safe thickness” or “universal minimum.” Where the minimum value is not confirmed, request the missing documentation before presenting a guessed number as a product specification.
Internally, record the accepted source and review date so the value can be checked when the supplier revises the item. Keep the marking photograph attached to the correct specimen record, not as a generic image applied to an entire disc family. Artwork created for an explanatory article should never be substituted for actual product-marking evidence.
If a customer asks whether a disc can continue in service, explain which catalog information is available and provide the relevant source for technical review. Do not convert a product-listing field into an unsupported promise about that customer's disc condition.
Decide what to do with incomplete or conflicting rows
Different gaps require different actions. A missing unit is a data-definition problem; a legible marking that disagrees with a document is a source conflict. Sending the same generic clarification request for both can leave the cause unresolved. State which record is incomplete and what information would let the reviewer close that specific gap.
A supplier file has only one thickness column
Leave the field unmapped until its meaning is established. A number alone does not tell the importer whether it describes a new disc or a minimum limit. Retain the supplier column heading, reference and original cell, then request the field definition and the missing counterpart if needed for your listing. After clarification, map the value into its named destination rather than duplicating it into both columns.
The value matches but the unit or reference is missing
Matching digits do not establish a match between records. Recover the unit from the actual source and connect the row to its full item reference before comparing it with a marking. If a catalog export strips the unit because all dimensions use a shared header, preserve that header with the exported evidence. A detached screenshot of the cell can otherwise remove the information that made the entry interpretable.
A revised document changes the minimum field
Keep the previous and revised statements with their revision dates and ask which offered reference or production variant each covers. Do not silently apply the revised figure to all historical stock. The practical decision is whether the correction concerns a catalog error, a reference change or another documented distinction. Where the supplier cannot explain that relationship, keep the affected listing unresolved and identify the stock records needing further review.
The photo is clear but the records disagree
Improve the identity chain rather than repeatedly requesting a sharper image. Link the photographed specimen, its label and the accompanying document to the same offered reference. If that chain is established and the values still conflict, send the exact transcription and both document statements together. A supplier reply should resolve the conflict in writing; another generic product photograph cannot explain why the records differ.
Send a reference-specific thickness inquiry
Browse the current MAKEXCAR Brake Discs category for published item references. Category membership does not establish a shared minimum-thickness value or interchangeability. Start from the exact item and your application information.
Use MAKEXCAR contact to send the following review cover sheet with your source documents. Keep requested quantity in the commercial inquiry, and keep the catalog-review outcome separate from a workshop service decision.
Requested and offered disc references: ___; suffix/variant and axle/application context: ___.
Source file or URL: ___; document revision/date: ___; named new-thickness field and unit: ___; named minimum-thickness field and unit: ___.
Photographed specimen ID: ___; image filename: ___; exact visible marking: ___; unreadable characters or missing unit: ___.
Imported catalog row: ___; field mapping: ___; conflict with source or specimen: ___; clarification needed: ___.
Supplier response and date: ___; accepted reference/revision: ___; catalog change: ___; unresolved item and reviewer: ___.
