Check applicability first
The vehicle category, build information, approval pathway and proposed configuration need to be identified before selecting an applicable edition. Use the official catalogue and legislation; the latest published edition is not automatically the right edition for every existing vehicle.
Identify the relevant rule family
ADR 31 concerns braking systems for passenger cars, while ADR 35 concerns commercial vehicle braking systems. The correct selection and edition depend on the actual vehicle classification and applicability provisions. Do not choose a rule solely from a familiar model name.
Describe the system and changes
For an initial discussion, send the vehicle identity, relevant mass information if known, wheel and tyre information, and details of changes to brakes, controls or the vehicle configuration. Existing test evidence should identify the tested system and vehicle so its relevance can be assessed.
Common questions
Does installing larger brakes establish compliance?
Component size alone does not establish the performance or compliance of a braking system. The whole configuration and required evidence matter.
Related services and guides
Official references
Reference check: 20 October 2026. The applicable edition and vehicle coverage must be checked for the particular project.