9.6.1. Principle of action

The brake system operates most effectively at the maximum coupling of the tire with a paving. When braking the tire begins to slide on the surface of the road. Thus, the speed of rotation of a wheel becomes less, than the speed of the movement of the car. Sliding is minimum (0%) when the wheel freely slides, and as much as possible (100%) when it is blocked. Maximum efficiency of action of brakes is reached when sliding about 15%. At this value sufficient controllability and stability of the car is also provided. ABS provides immediate restriction of brake pressure in brake mechanisms of each wheel for receiving coefficient of sliding, near optimal, at change of a condition of a paving or loading.