Federal Motor Vehicle Safety Standards: Air Brake Systems

Resumen

Pursuant to the agency's partial grant of a petition for rulemaking from the Truck Manufacturers Association, NHTSA proposes to amend the air brake standard to correct an inconsistency between two provisions concerning emergency brake stops, provide that single-unit truck axles should not be overloaded, clarify the wheel-lock provisions by adding a definition of ``tandem axle,'' and permit the use of roll bars on vehicles undergoing brake testing. NHTSA denies requests by the petitioner to amend the standard by revising the braking test sequence, changing the provisions regarding manual brake adjustments, changing the burnish procedure, specifying application of the service brake prior to applying the parking brake, and clarifying that emergency brake requirements for trucks and buses do not become effective until March 1, 1998.