Vacuum Brake Booster Check Valve: Service and Repair

CHECK VALVE INSPECTION

Airtightness Inspection





Use a handy vacuum pump to check.
When connected to booster side (1):
Vacuum decrease should be within 1.3 kPa (10 mmHg, 0.39 inHg) for 15 seconds under a vacuum of -66.7 kPa (-500 mmHg, -19.69 inHg)
When connected to engine side (2): No vacuum will be applied
Replace vacuum hose with the check valve as a set if damage or deformation is present at the vacuum hose.