Federal Motor Vehicle Safety Standards; Air Brake Systems; Air Compressor Cut-In
fmvss · National Highway Traffic Safety Administration · Published 1996-02-16 · 61 FR 6173
Document
Document number
96-3258
Federal Register citation
61 FR 6173
CFR reference
49 CFR 571
Type
Rule
Action
Final rule.
Category
fmvss
Sub-agency
National Highway Traffic Safety Administration
Publication date
1996-02-16
DOT docket
Docket No. 90-3
Abstract
This document concludes a rulemaking proceeding begun in response to a petition for rulemaking submitted by the Truck Trailer Manufacturers Association (TTMA). It amends Standard No. 121, Air Brake Systems, to require the automatic activation of the air compressor on a powered vehicle whenever the pressure in the air brake system drops below 100 pounds per square inch (psi). The agency has concluded that the amendment will ensure that new truck tractors provide trailers with sufficient air pressure for release of the trailer parking brakes and provide adequate service braking. In addition, the amendment will provide greater air reserves on all air braked vehicles.