In order to promote the performance of the electromagnetic-hydraulic hybrid brake system when sudden stop occurs, a kind of hybrid system which adapts electromagnetic and hydraulic braking system was developed; it built a hydraulic mathematical model and a mathematical model of electromagnetic brake system which is different in low speed and high speed. Based on the force analysis of the 1/4 vehicle model, a sliding mode controller has been designed and hardware in loop experiment platform has also been constructed. The experiment which simulates on asphalt and ice road was made to compare with the commercial ABS at the same conditions. The results indicate that the hybrid brake system has more rapid responds time, more stable slip ratio controlling ability and less brake time than traditional hydraulic brake system. And at the same time, due to the electromagnetic braking system, the system’s abrasion and the braking heat fading or thermal failure is falling.