
Appearance
Check for correct assembly, damage and deterioration.

Check Valve Airtightness
- Use a handy vacuum pump (A) to check.

When connected to the booster side (B):
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| Vacuum must be decrease within 1.3 kPa (9.8 mmHg, 0.38 inHg) for 15 seconds under a vacuum of −66.7 kPa (−500 mmHg, −19.69 inHg).
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When connected to the engine side (C):
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| Vacuum must be not exist.
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- Replace vacuum hose assembly if vacuum hose and check valve are malfunctioning.