49 CFR 571 121-2009
Standard No. 121; Air brake systems.

Standard No.

49 CFR 571 121-2009

Release Date

2009

Published By

FMVSS - Federal Motor Vehicle Safety Standards

Scope

This standard establishes performance and equipment requirements for braking systems on vehicles equipped with air brake systems. Purpose. The purpose of this standard is to insure safe braking performance under normal and emergency conditions.