This paper represents a nonlinear identification of the electronic brake pedal behavior in brake-by-wire (BBW) system. The electro-mechanical brake (EMB) in BBW system has become an advanced automotive braking system that enhanced performances without a mechanical or hydraulic backup. We developed the BBW system and the Group Method of Data Handling (GMDH) algorithm is also applied because of the brake pedal sensor output depends on many nonlinear interactions. After analyzing the experiment results, we found that GMDH algorithm can effectively identify the electronic brake pedal system.