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LESSON 3: BRAKE SYSTEMTESTING AND DIAGNOSIS RESTRICTED OR LEAKING BRAKE LINE LEAKING MASTER CYLINDER BRAKE PEDAL PUSH ROD, RETURN SPRING, OR BUSHING WORN OR SCORED DISC ROTOR INOPERATIVE METERING VALVE PROPORTIONING VALVE BAD COMMON BRAKE SYSTEM CONCERNS LEAKING WHEEL CYLINDER DRUM BRAKE WORN OR SCORED Symptom-to-System-to-Component-to-Cause Diagnostic Technique The Workshop Manual is organized to aid in the Symptom-to-System-to-Component-to-fiause Diagnostic Technique. Make sure that you fully understand the symptom. Determine which system on the vehicle could be causing the concern. Then determine the component within that system that is faulty. Finally, determine what caused the component to fail. General Brakes Theory and Operation March 31,1998 3-5