Initial Inspection and Diagnostic Overview

INSPECTION - BRAKE SERVO SYSTEM
^ With the engine off, depress the brake pedal several times applying the same pedal force: Make sure the travel distance should not change.
^ With the brake pedal depressed, start the engine: Make sure the pedal should move slightly toward the floor.
^ With the brake pedal depressed, stop the engine and keep the pedal depressed for 30 seconds: Make sure the pedal height should not change.





^ Check valve is built into the vacuum hose. Disconnect the vacuum hose to inspect function of check valve.
^ 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.
^ 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.
^ 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.

^ Check vacuum hose to make sure it is tight and secure.