In case of malfunction in a hydrodrive of working brake system there is a refusal of one of contours and leak from нeгo a brake liquid. Malfunction of a drive is fixed by fire on a combination of devices of a lamp of red colour which joins a signalling device of emergency falling of level of a liquid in a tank of the main cylinder.

By pressing a brake pedal the remained serviceable contour provides effective enough braking of the car, but the course of a pedal and braking thus increases begins at a backlash between a pedal and a floor a body of 15-40 mm.