Business · 23/09/1996Updated: 10/18/2026 · 1 min read

Federal Motor Vehicle Safety Standards; Stability and Control of Medium and Heavy Vehicles During Braking - Amendment to Air Brake Systems Standard

The National Highway Traffic Safety Administration (NHTSA) has amended the Federal Motor Vehicle Safety Standard (FMVSS) 121, Air Brake Systems, to specify the requirements for antilock brake system (ABS) malfunction indicator lamps on trailers and trailer converter dollies, aiming to improve driver and maintenance awareness of potential ABS malfunctions.

Original source language: Federal Register — National Highway Traffic Safety AdministrationOpen original release →

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Federal Motor Vehicle Safety Standards; Stability and Control of Medium and Heavy Vehicles During Braking - Amendment to Air Brake Systems Standard

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