# Federal Motor Vehicle Safety Standards; Air Brake Systems
> **National Highway Traffic Safety Administration** · Final rule; response to petition for reconsideration. · Published 2013-02-11 · Effective 2013-02-11 · 78 FR 9623
## Document
- **Document number:** 2013-02987
- **Category:** fmvss
- **Sub-agency:** National Highway Traffic Safety Administration
- **Federal Register citation:** 78 FR 9623
- **CFR reference:** 49 CFR 571
- **Publication date:** 2013-02-11
- **Effective date:** 2013-02-11
- **DOT docket:** Docket No. NHTSA-2013-0011
## Abstract

On July 27, 2009, NHTSA published a final rule that amended the Federal motor vehicle safety standard for air brake systems by requiring substantial improvements in stopping distance performance on new truck tractors. This final rule responds to petitions for reconsideration of a July 27, 2011 final rule that slightly relaxed the stopping distance requirement for typical loaded tractors tested from an initial speed of 20 mph. NHTSA is granting the request to remove the stopping distance requirements for speeds of 20 mph and 25 mph and denying the request to relax the stopping distance requirements for speeds between 30 mph and 55 mph.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2013/02/11/2013-02987/federal-motor-vehicle-safety-standards-air-brake-systems)
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