3.31. Check of serviceability of functioning of the vacuum amplifier of brakes

 PERFORMANCE ORDER

1. Check of serviceability of functioning of the vacuum amplifier of brakes is made from the driver's place.
2. At completely squeezed out pedal of a foot brake start the engine, - the pedal has to fail a little more.
3. At the working engine several times squeeze out a pedal of a foot brake. The size of the course of a pedal has to remain a constant.
4. Squeeze out a pedal, kill the engine and continue to hold a pedal pressed within about 30 more seconds during which it should not neither fail below, nor rise.
5. Again start the engine, let's it work for about a minute, then again muffle. Again several times firmly squeeze out a pedal, - the size of the course has to be reduced with each muscleman.
6. In case of negative result of the described check the servo-driver of the vacuum amplifier of brakes is subject to recovery repair or replacement (see the Head the Brake system).