LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Ford >> 1989 >> Bronco II 4WD, Standard, M5OD-R1 >> Repair and Diagnosis >> Engine Performance >> System >> Vacuum Check Valve >> Description & Operation
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Description & Operation

Vacuum Check Valves (V-CkV) are used to block airflow in one direction while allowing free airflow in the opposite direction. Typically used in-line with vacuum reservoir to provide a steady vacuum source for components during acceleration or other variable vacuum situations.

NOTE: Use care to prevent oil or dirt from entering valves during testing.