Check Valve Operation Check

WARNING: This page is about a different car, the 2005 Mitsubishi Endeavor. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION: The check valve should not be removed from the vacuum hose.

Remove the vacuum hose. (Refer to MASTER CYLINDER ASSEMBLY AND BRAKE BOOSTER ).
CAUTION: If the check valve is defective, replace it as an assembly unit together with the vacuum hose.

Check the operation of the check valve by using a vacuum pump.

Fig 1: Checking Operation Of Check Valve By Using Vacuum Pump

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

VACUUM PUMP CONNECTION AND CRITERIA

VACUUM PUMP CONNECTION	CRITERIA
Connection at the brake booster side (A)	A negative pressure (vacuum) is created and held.
Connection at the intake manifold side (B)	A negative pressure (vacuum) is not created.