Volkswagen Workshop Service and Repair Manuals

Vacuum reservoir leak test.

• ‒ Remove air cleaner.
• ‒ → Pull vacuum hose off vacuum reservoir -arrow-.

• ‒ → Connect up vacuum tester V.A.G 1368 between vacuum reservoir and vacuum hose detached.
• ‒ Set vacuum tester to throughflow.
• ‒ Start engine and let it idle until a vacuum of approx. 500 mbar is indicated on vacuum tester.
• ‒ Set vacuum tester such that vacuum is held on reservoir end.
  The vacuum may not drop off within 2 minutes. Otherwise vacuum reservoir is to be renewed.
• ‒ Attach vacuum hose to vacuum reservoir.

Checking pull-down unit for leaks

• ‒ → Pull vacuum hose off vacuum reservoir at T piece and seal connection -arrow-.
• ‒ Pull vacuum hose pull-down unit.

• ‒ → Connect up vacuum tester between vacuum hose/servo unit and pull-down unit.
• ‒ Set vacuum tester to throughflow.
• ‒ Start engine and let it idle until a vacuum of approx. 500 mbar is indicated on vacuum tester.
• ‒ Set vacuum tester such that vacuum is held on pull-down end.
  The vacuum must not drop off within 2 minutes. Otherwise renew pull-down unit/vacuum hoses.