| 1) remove a vacuum hose from the pump of the control of level of depression |
| 2) move connecting draught towards the vacuum amplifier against the stop |
| 3) close the end of a vacuum hose a finger |
| 4) cоединительная draught should not return to a starting position; if it comes back in a starting position, it means that the vacuum system is not tight |
5) check up following elements on tightness:
– Vacuum final valves;
– Check up, that vacuum final valves have been correctly established;
– The vacuum amplifier;
– Vacuum hoses |
| 6) eliminate the found out leaks |