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Hydraulic brake pipes are responsible for fluid flows and as consequence the proper functionality of the most important safety system in passenger vehicles. Even so, this component has no much development since it was applied in the 1930s. In fact, the brake pipes can be particularly vulnerable components, being mainly in an exposed condition under the vehicle and near of components with relative movement. Externally it needs to survive a wide range of environmental conditions whereas internally it must withstand pressurized brake fluid. Brake pipes failures is an obvious safety hazard. Using simulations with car body, burst and corrosion bench test and multiple linear regression, this paper attempts to present, basing the pipes lifetime in the burst bench test, how the pipes are really vulnerable or not to damages caused by interference with other components, corrosion or even in frequent abrasion.

This paper focused on pedal feeling studies at most often longitudinal decelerations for the normal daily usage of customers. Such decelerations were defined in vehicle equipped with sensors in a specific itinerary near Resende/Penedo city (southeastern Brazil) with several clients using the same vehicles. Through the decelerations acquired, one could correlate, objectively and subjectively, the pedal effort and travel that delight the customers, reaching the so called ideal pedal feeling. The mapping provides the needed input data to develop, or adapt, a vehicle to the best condition expected by consumers.

The new requirements adopted to reduce fuel consumption and the emission pollutants control (EURO 5/L5) in synergy with the dual fuel engines massive popularization caused a significant reduction in the vacuum generation available by combustion engines. As a consequence this severely penalizes the braking performance in some critical use situations. The reduction in the vacuum generation significantly reduces the booster saturation knee point, increasing the effort on the brake pedal in the use. One possible solution and cost-effective to improves the booster vacuum level is the Venturi tube application. This paper attempts to present the results achieved in vehicle before and after a Venturi tube application and the possible effects on such application.