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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.