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This work consists in a study about regulations for brake system in Brazil, which aims to show the current scenario, as well as the evolution of the resolutions and technologies. Within the last few years Brazil had a considerable evolution in terms of safety requirements for brake systems. In 2009 an important step was taken when Brazilian Traffic National Consil (Conselho Nacional de Trânsito - CONTRAN), the agency responsible for traffic regulations in Brazil, emitted the resolution N° 312, which established the mandatory use of Anti-lock Brake System (ABS). This obligatoriness was introduced gradually, beginning by passengers cars in 2010, when 8% of the automobiles manufactured in that year should have the system installed as standard item. This percentage would increase until reaching 100% of vehicle production in 2014.

The anti-lock brake system, known as ABS, whose the main function is to ensure directional stability and, consequently, the handling of the vehicle in an emergency brake application. Acting on the brakes, prevents the wheels are locked in extreme situations as well as in various applications on low friction floors. The most common applications found in our market are vehicles whose brakes are fully hydraulic or pneumatic. The purpose of this paper is to present all ABS development phases on an “air over hydraulic” vehicle, in other words, the front brake is acted by a hydraulic system and the rear by a pneumatic.