# Federal Motor Vehicle Safety Standards; Stability and Control of Medium and Heavy Vehicles During Braking
> **National Highway Traffic Safety Administration** · Final rule, petitions for reconsideration. · Published 1996-02-15 · Effective 1997-03-01 · 61 FR 5949
## Document
- **Document number:** 96-3382
- **Category:** fmvss
- **Sub-agency:** National Highway Traffic Safety Administration
- **Federal Register citation:** 61 FR 5949
- **CFR reference:** 49 CFR 571
- **Publication date:** 1996-02-15
- **Effective date:** 1997-03-01
- **DOT docket:** Docket No. 92-29
## Abstract

This document responds to petitions for reconsideration of final rules that amended FMVSS No. 105, Hydraulic Brake Systems, and FMVSS No. 121, Air Brake Systems, to require medium and heavy vehicles to be equipped with an antilock brake system (ABS). In response to the petitions, this document requires continuous power for trailer ABS systems, in place of the dedicated power and separate ground previously required, and delays the implementation date for the in-cab trailer malfunction indicator by four years. It also extends by three years the period in which exterior ABS failure indicators are required on trailers.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1996/02/15/96-3382/federal-motor-vehicle-safety-standards-stability-and-control-of-medium-and-heavy-vehicles-during)
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