# Federal Motor Vehicle Safety Standards; Air Brake Systems
> **National Highway Traffic Safety Administration** · Final rule; technical amendment. · Published 1996-05-31 · Effective 1997-03-01 · 61 FR 27288
## Document
- **Document number:** 96-13557
- **Category:** fmvss
- **Sub-agency:** National Highway Traffic Safety Administration
- **Federal Register citation:** 61 FR 27288
- **CFR reference:** 49 CFR 571
- **Publication date:** 1996-05-31
- **Effective date:** 1997-03-01
- **DOT docket:** Docket No. 96-050
## Abstract

This document revises Standard No. 121, Air brake systems to remove obsolete provisions and to update and reorganize the standard. This revision substantially clarifies and simplifies this safety standard without changing any of its substantive requirements.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1996/05/31/96-13557/federal-motor-vehicle-safety-standards-air-brake-systems)
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