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Check Valve Operation Check

CAUTION: The check valve should not be removed from the vacuum hose.
  1. Remove the vacuum hose. (Refer to MASTER CYLINDER ASSEMBLY AND BRAKE BOOSTER ASSEMBLY  .
    CAUTION: If the check valve is defective, replace it as an assembly together with the vacuum hose.
  2. Check the operation of the check valve by using a vacuum pump.
    OPERATION CHART

    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.
    Fig 1: Checking Operation Of Check Valve By Using A Vacuum Pump
    G06249043Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
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