9-2X F4-2.5L (2006)
Vacuum Brake Booster: Initial Inspection and Diagnostic Overview
INSPECTION - BRAKE SERVO SYSTEM
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With the engine off, depress the brake pedal several times applying the same pedal force: Make sure the travel distance should not change.
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With the brake pedal depressed, start the engine: Make sure the pedal should move slightly toward the floor.
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With the brake pedal depressed, stop the engine and keep the pedal depressed for 30 seconds: Make sure the pedal height should not change.
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Check valve is built into the vacuum hose. Disconnect the vacuum hose to inspect function of check valve.
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Blow air into the vacuum hose from its brake booster side end: Air must flow out of engine side end of hose. Next blow air into the hose from
engine side: Air should not flow out of hose.
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Replace both check valve and vacuum hose if the check valve is faulty. Engine side of vacuum hose is indicated by marking "ENG" as shown.
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Check the vacuum hose for cracks or other damage.
NOTE: When installing the vacuum hose on the engine and brake booster, do not use soapy water or lubricating oil on their connections.
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Check vacuum hose to make sure it is tight and secure.
