With diesel engine
Do not disassemble. Vacuum pump "1". Vacuum hose to brake booster "2" with check valve.
With a petrol engine
Do not disassemble. Vacuum pump "1". Vacuum hose to brake booster "2" with check valve. High-pressure fuel pump "3".
Checking the check valve
The check valve "A" must let the air supplied in the direction of the arrow through. When air is supplied in the opposite direction, the valve must remain closed and not let air through. Install the valve correctly!
The original article is posted on the website VWmanual
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