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1.
| caution |
The check valve should not be removed from the vacuum hose.
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Remove the vacuum hose (Refer to  <LHD> or <RHD>).
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2.
| caution |
If the check valve is defective, replace it as an assembly unit together with the vacuum hose.
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Check the operation of the check valve by using a vacuum pump.
Vacuum pump connection
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Normal condition
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When connected to the booster side (A)
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Vacuum is generated and maintained.
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When connected to the engine side (B)
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No vacuum is generated.
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