ISO 7628-2 is a requirements-and-test-methods standard for thermoplastics tubing used in road-vehicle air braking systems, focused on how tubing is mounted on the vehicle and how it is tested for suitability.
If you need help determining whether a customer specification still calls up this withdrawn part standard or its later replacement, talk with our team about edition matching and practical test setup.
ISO 7628-2:1998 — Road vehicles — Thermoplastics tubing for air braking systems — Part 2: Mounting on vehicle and test methods
ISO 7628-2 is a part-specific document that addresses installation-related requirements (mounting on the vehicle) and associated test methods for thermoplastic air-brake tubing. It is commonly referenced alongside the companion Part 1 (dimensions and marking) when an OEM or tier supplier is qualifying tubing for pneumatic braking service.
This specific part (ISO 7628-2:1998) has been withdrawn, and ISO has published ISO 7628:2010 as the newer edition that supersedes the earlier multi-part structure. Many purchase specifications still cite legacy designations, so it is important to align testing to the exact callout used in the contract or drawing.
Quick Definition
What it is: A tubing requirements document with mounting guidance and test methods for thermoplastics tubing used in road-vehicle air braking systems.
What it is not: A blanket approval for a complete hose/tube assembly on a vehicle—end fittings and assembly performance may be addressed separately by the vehicle manufacturer, assembler, and the referenced annex tests.
What This Standard Covers
ISO 7628-2 addresses minimum requirements and verification testing tied to thermoplastic tubing intended for pneumatic braking circuits on road vehicles. In addition to installation/mounting considerations, it includes test methods used to check that tubing meets the performance expectations for air-brake service.
Where customer specifications call up tubing categories (for example by working pressure and temperature range), ISO 7628-2 is used as the technical basis for selecting tubing construction and planning the verification program.
Why This Standard Matters in Testing
Air braking systems are safety-critical. Standards-based tubing verification helps reduce risk from leakage, loss of pressure integrity, or installation-related damage that can occur in service environments involving vibration, temperature extremes, and routing constraints.
For lab and production QA/QC teams, ISO 7628-2 typically serves as the checklist for which tubing performance checks must be demonstrated before tubing can be marked/accepted under the referenced requirements.
Common Materials, Product Types, or Applications Covered
Common product types: Extruded thermoplastic tubing used to route compressed air in vehicle pneumatic braking circuits.
Common applications: Commercial vehicles and other road vehicles using air brake systems where tubing is routed through chassis areas and mounted/clipped to vehicle structures.
Related build level: Depending on the procurement and design responsibility, requirements may apply to straight tubing and may also reference checks on tube assemblies (tubing plus end fittings).
Common Test or Verification Workflow
Workflows based on ISO 7628-2 typically begin by confirming the exact tubing category and intended service conditions defined by the purchasing requirement, then preparing representative tubing samples (and, where applicable, tube assemblies with end fittings) for verification.
Common verification themes: Pressure integrity checks (leak or pressure-related performance), mechanical robustness checks relevant to tubing and connections, and environmental conditioning that reflects air-brake service temperature exposure. The specific conditioning, acceptance criteria, and reporting content depend on the cited edition and annex requirements.
Equipment Commonly Used for This Standard
ISO 7628-2 often drives equipment selection more by pneumatic pressure capability and environmental conditioning needs than by a single universal test machine configuration. Typical lab setups include:
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Pneumatic/hydrostatic pressure test equipment: Pressure generation and monitoring hardware to support leakage checks or other pressure-based verification on tubing or tube assemblies.
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Environmental conditioning: Temperature chambers or controlled environments when verification includes performance at elevated and/or low temperatures.
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Mechanical test capability for assemblies: Where tube assemblies are evaluated, fixtures and a test frame may be required to apply controlled mechanical loads to tubing-to-fitting interfaces (the exact loading method depends on the cited clauses/annexes).
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Dimensional/inspection tools: Gauging and visual inspection tools to support identification, marking checks, and basic conformity assessments when required by the overall ISO 7628 callout.
If you are building or upgrading a bench for air-brake tubing verification, you can request a detailed quote for a pressure-and-environment test setup matched to your target pressure range, sample type, and throughput.
How to Read This Designation or Revision
ISO 7628-2 identifies Part 2 of the ISO 7628 series that historically addressed mounting on the vehicle and test methods. When written as ISO 7628-2:1998, the “1998” indicates the publication year of that edition.
Status note: ISO 7628-2:1998 is withdrawn, and ISO 7628:2010 is published as the newer edition. When a drawing, PPAP, or contract cites “ISO 7628-2,” the safest approach is to confirm whether the customer intends the legacy part standard or the consolidated ISO 7628:2010 requirements.
Related Standards, Methods, or Frameworks
ISO 7628-2 is commonly used with other documents depending on what is being qualified:
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ISO 7628-1 (Part 1) for dimensions and marking when the requirement includes tubing identification and dimensional conformity.
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ISO 7628:2010 as the later published edition that supersedes the withdrawn multi-part structure.
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ISO 7375 where coiled tube assemblies are involved and a separate document is specified for that product form.
Get help selecting a practical ISO 7628 test setup
Whether you are qualifying new tubing, validating an alternate supplier, or responding to an OEM audit, we can help map the cited ISO 7628 designation to a realistic equipment and documentation plan. For quick guidance on editions, sample configuration (tubing vs. tube assembly), and bench requirements, contact our team.