The vacuum amplifier of brakes represents the difficult hardly sorted design. Its adjustment and repair requires qualified personnel and the special equipment. Besides, the amplifier represents the device which is directly influencing traffic safety. Its low-quality repair can lead to serious consequences therefore at malfunction replace the amplifier assembled. Ways of check of efficiency of the vacuum amplifier of brakes are described in section 4 "Maintenance" (see. "Check of operation of the vacuum amplifier of brakes"