| 1) remove a vacuum hose from the pump of control of level of depression |
| 2) move connecting draft towards the vacuum amplifier against the stop |
| 3) close the end of a vacuum hose a finger |
| 4) connecting draft should not return to a starting position; if it comes back to a starting position, it means that the vacuum system is not tight |
5) check the following elements for tightness:
– vacuum final valves;
– check that vacuum final valves were correctly installed;
– vacuum amplifier;
– vacuum hoses |
| 6) eliminate the found leaks |