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| Open shut-off valve -C- to evacuate brake servo. |
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| Read and make a note of measured value shown. |
A vacuum decrease of 400 mbar in 12 hours is permissible. |
If the vacuum decrease is greater, check for leaks in the vicinity of... |
2 - | non-return valve, vacuum hoses with connectors or vacuum pump/intake manifold. |
If there are large leaks, the vacuum will decrease rapidly within a few seconds. |
Vacuum check in vicinity of brake servo: |
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