In (12), m is the quality of the EV, b is the centroid of the EV to the rear axle centerline distance (in meters), hg is the height of the centroid of the EV, and L is the distance between the front and rear axles of the EV (in meters). In Fig. 9, z is the braking strength, which is defined as z = dv/dt/g, where v is the EVs’ speed and g is the acceleration of gravity. The frontand rear-wheel braking force allocation strategy of the EVs is as follows: When z < 0.1, the total braking force ΣF is all borne by the drive wheel, and the front wheel is not involved in the braking of the vehicle. When 0.1 < z < 0.7, the braking force is allocated by electromechanical composite brake. According to (12), it can be learned that, when the EV front and rear wheels are locked, the ideal braking force distribution curve (I curve) is shown in Fig. 9 [3]. Given in any adhesion coefficient of the road with the front and rear wheels simultaneously locking of the conditions are the following: The front- and rear-wheel braking forces are equal to adhesion φ, and there holds