Fuzzy logic is a powerful method for mapping space input into space output. Between space input
and output there is a black box for mapping input towards suitable output. Although many ways
works with the black box, fuzzy logic will give powerful solution. The purpose of the research is
looking for relation parameters between velocity and brake pressure of vehicle model that can be
control to determine optimum brake distance of vehicle model by using rules base of fuzzy logic
with verbose format. The step of research methodology are: determining space input variable of
fuzzy logic i.e. : velocity and brake pressure, using fuzzy operator, using implication function,
composing space fuzzy output of brake distance, and then processing of defuzzification. The result
of this research has given optimum brake distance of model vehicle. Where as the maximum of
velocity = 112 km/h and brake pressure (P brake) = 80 bars will give minimum brake distance = 24.90
meters, if brake pressure ≤ 22.8 bars will give maximum braking distance = 52.30 meters. The
conclusion is model vehicle with brake pressure 20 bars <P brake< 80 bars will give brake distance:
24.90 meters< S brake< 52.30 meters in working velocity.
