Federal Motor Vehicle Safety Standards; Hydraulic and Electric Brake Systems

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In this document, NHTSA proposes to amend the Federal motor vehicle safety standard on hydraulic and electric brake systems to include an option for the use of a roll bar structure during specified testing of brake systems in single unit trucks and buses. This option is already available during similar testing of air braked trucks and buses. We tentatively conclude that permitting the use of a roll bar structure would help protect drivers and technicians in the event of a rollover during testing of hydraulically-braked trucks and buses. The safety of drivers and technicians is a primary concern during vehicle testing. The use of a roll bar structure would offer protection to the drivers and technicians performing brake tests conducted at lightly loaded vehicle weight.