Brake emissions in light vehicles: new UN homologation requirements 2026

Key data

Light vehicle manufacturers wishing to sell in Europe have a new technical requirement to meet: measuring in the laboratory the particle emissions generated by their vehicles' brakes. The United Nations Regulation No. 179, published on May 18, 2026 under reference CELEX:42026X1044, introduces this obligation within the type approval process.

Until now, vehicle emission regulation focused on exhaust gases. Particles from brake wear — a relevant source of pollution in urban environments — fell outside traditional limits. This regulation closes that gap.

What does this regulation establish?

UN Regulation No. 179 establishes uniform provisions for the homologation of light vehicles regarding the laboratory measurement of particle emissions from brakes. It is articulated under the framework of the 1958 UNECE Agreement, which is the international reference system for vehicle homologation.

The key elements it introduces are:

• Standardized laboratory test methodologies to measure particles emitted by braking systems.
• Obligation to pass these tests to obtain type approval for any light vehicle intended for the European market.
• Update of protocols in homologation laboratories and technical authorities, which must adapt their procedures to the new requirements.
• Regulation of an emission type not covered by traditional exhaust limits, which represents a shift in urban air quality policy.

The adoption of this regulation in the EU means that any light vehicle wishing to obtain approval for commercialization in the European market must pass these brake emission measurement controls.

Economic and operational impact

The impact of this regulation is not primarily a fine or fee: it is a market access requirement. A vehicle that does not pass the tests does not obtain type approval and therefore cannot be sold in Europe. The operational and economic consequences are direct:

• Investment in certification process adaptation: Manufacturers must review and, if necessary, redesign internal technical validation procedures to incorporate the new brake emission tests.
• Cost of laboratory tests: Each type approval process will require specific particle emission measurement tests, with the associated cost of time and technical resources.
• Impact on brake system suppliers: Brake component suppliers must demonstrate that their systems comply with the required parameters, which may involve redesign of materials or pad and disc formulations.
• Update of laboratories and technical authorities: Homologation laboratories must invest in equipment and training to apply the new standardized test methodologies.
• Risk of launch delays: Manufacturers that do not anticipate these requirements in their development schedules may see the homologation of new models delayed.

Who does it affect?

• Light vehicle manufacturers that market or intend to market models in the European market: must adapt their certification processes and pass the new laboratory tests.
• Brake system suppliers (manufacturers of pads, discs, complete braking systems): must ensure that their components comply with the particle emission parameters required by the regulation.
• Homologation authorities in EU Member States: must update their test protocols and type approval procedures.
• Technical homologation laboratories: need to adapt their equipment and methodologies to the new measurement standards established by Regulation No. 179.
• R&D and homologation teams within automotive groups: are responsible for managing adaptation to the new requirements.

Practical example

A European light vehicle manufacturer plans to launch a new car model in the European market in 2027. Until now, its type approval process included exhaust emission tests, active and passive safety, and noise. With Regulation No. 179 in force, it must incorporate brake particle emission laboratory tests into that process.

This means that its brake system supplier must validate that the pads and discs of the new model generate particle emissions within the limits established by the regulation's standardized methodology. If the results are not satisfactory, the manufacturer must work with the supplier to reformulate the friction materials before being able to request type approval. Without that approval, the model cannot be legally sold in any EU country that has adopted this regulation.

The same scenario applies to a first-tier (Tier 1) brake supplier that supplies multiple manufacturers: it must certify its systems under the new methodology to maintain its position as an approved supplier in the European market.

What should companies do now?

1. Identify if the regulation affects models in development or in the renewal process: Review the portfolio of light vehicles pending homologation or in the development phase to determine which must undergo the new brake emission tests.
2. Contact brake system suppliers: Request information from pad, disc and braking system suppliers about their capacity to comply with the test methodologies of Regulation No. 179 and expected results.
3. Review homologation schedules: Incorporate the new laboratory tests into certification plans to avoid delays in planned product launches.
4. Verify the capacity of test laboratories: Confirm that the laboratories the company works with have updated or plan to update their protocols and equipment according to the new standards.
5. Monitor the entry into force date: The regulation was published on May 18, 2026 but the effective application date has not been specified. It is necessary to follow the publication of implementing measures in the EU Official Journal (EUR-Lex) to know the exact compliance deadlines.
6. Evaluate the impact on the supply chain: If the company acts as a Tier 1 or Tier 2 brake system supplier, initiate technical validation processes to maintain eligibility as an approved supplier in the European market.