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DOT/NHTSA RIN: 2127-AA00 Publication ID: Spring 1995 
Title: Heavy Duty Vehicle Brake Systems (Formerly Truck and Trailer Brake Systems) 
Abstract: This rule requires medium and heavy vehicles to be equipped with an antilock brake system (ABS) to improve directional stability and control during braking. For truck tractors, the ABS requirement is supplemented by a 30-mph braking-in-a-curve test on a low coefficient of friction surface using a full brake application. This rule was required by the Intermodal Surface Transportation Efficiency Act of 1991. 
Agency: Department of Transportation(DOT) 
RIN Status: Previously published in the Unified Agenda Agenda Stage of Rulemaking: Completed Actions 
CFR Citation: 49 CFR 571.121    49 CFR 571.105   
Legal Authority: 49 USC 322    49 USC 30111    49 USC 30115    49 USC 30117    49 USC 30166   
Legal Deadline:
Action Source Description Date
Final  Statutory  NHTSA may issue either an ANPRM or NPRM.  06/08/1994 
NPRM  Statutory    05/31/1992 
Timetable:
Action Date FR Cite
ANPRM: Comment Period End 04/16/79  02/15/1979  44 FR 9783   
Second ANPRM: Comment Period End 05/28/80  02/28/1980  45 FR 13155   
ANPRM  06/08/1992  57 FR 24212   
ANPRM Comment Period End  08/07/1992    
NPRM  09/28/1993  58 FR 50738   
NPRM Comment Period End  11/29/1993    
Notice of Intent: Delay in Rulemaking  12/13/1993  58 FR 65156   
SNPRM Comment Period End 05/12/94  04/12/1994  59 FR 17326   
Final Action  03/10/1995  60 FR 13216   
Additional Information: Docket No. 79-03. ANPRM, Notice 1; Second ANPRM, Notice 3. A Notice of Intent to delay rulemaking was published on 12/13/93 (58 FR 65156) to extend the rulemaking period from 12/8/93 to 6/8/94. ^PANALYSIS: Regulatory Evaluation, 09/28/93, 58 FR 50738
Regulatory Flexibility Analysis Required: No  Government Levels Affected: None 
Included in the Regulatory Plan: No 
Agency Contact:
Dr. Patricia Breslin
Office Director, Office of Planning and Consumer Programs
Department of Transportation
National Highway Traffic Safety Administration
400 Seventh Street SW.,
Washington, DC 20590
Phone:202 366-0842