In case of malfunction in a hydraulic actuator of the working brake system there is a refusal of one of contours and leak from it brake fluid. Malfunction of the drive is fixed by fire on a combination of devices of a lamp of red color which joins a signaling device of emergency falling of level of liquid in a tank of the main cylinder.

By pressing a brake pedal the remained serviceable contour provides rather effective braking of the car, but at the same time the course of a pedal increases and braking begins at a gap between a pedal and a floor a body of 15 — 40 mm.