If the brake pedal became "soft", and by several consecutive pressing becomes "firmer", so air got to the hydraulic brake drive.

For removal of air from system it is necessary to pump over brakes. The procedure of pumping of brakes quite simple, but is more convenient to carry out it with the assistant.

Pumping of the brake system is in detail described in section 9 "Brake system" (see. "Pumping of a hydraulic actuator of the brake system").