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Transportation Department National Highway Traffic Safety AdministrationFederal RegisterMed source confidence · 81%Jun 26, 2026, 9:04 AM UTC · 12d ago

Federal Motor Vehicle Safety Standards; Modernization of FMVSS No. 135 To Accommodate ADS-Equipped Vehicles

Case File

The National Highway Traffic Safety Administration (NHTSA) is proposing to amend Federal Motor Vehicle Safety Standard No. 135 regarding light vehicle brake systems. The changes will clarify regulations for vehicles with and without manual controls. Affected parties include vehicle manufacturers and suppliers. The effective date for these changes is June 26, 2026.

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Why This Matters

Vehicle manufacturers must comply with the updated regulations by adapting their brake systems for both automated and manual vehicles. This may involve revising testing procedures and definitions to align with the new standards.

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