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HEAVY TRUCK BRAKES MICHIGAN MECHANIC STUDY GUIDE Exam with correct Answers.
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HEAVY TRUCK BRAKES MICHIGAN MECHANIC STUDY GUIDE Exam with correct Answers.
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HEAVY TRUCK BRAKES MICHIGANMECHANIC STUDY GUIDE Exam with
correct Answers
AN ENGINE BRAKE (JACOBS BRAKE) - ANS-A. IS A SELF-ENERGIZING SERVO TYPE.
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B. IS NORMALLY USED IN PLACE OF A SPRING BRAKE.
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C. RESTRICTS THE INTAKE PORT AND CAUSES A BUILD UP OF 30-45 LBS OF PRESSURE.
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D. OPENS THE EXHAUST VALVES NEAR THE TOP OF THE COMPRESSION STROKE TO
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n RELEASE THE COMPRESSED AIR. (CORRECT AWNSER)
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IN THE SYSTEM SHOWN BELOW, THE PART AT C IS: - ANS-A. AN INVERSION VALVE.
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n (POSSIBLE CORRECT AWNSER) n n
B. A SAFETY VALVE.
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C. A MODULATOR VALVE. (NOT CORRECT AWNSER)
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D. A RELAY VALVE.
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A MECHANIC HAS REMOVED A BRAKE DRUM AND FOUND THE BRAKE LININGS SOAKED
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n WITH GREASE. THE BRAKE LININGS SHOULD BE: - ANS-A. REPLACED. (CORRECT
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n AWNSER)
, B. SANDED TO ROUGHEN UP THE FRICTION SURFACE.
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C. DIPPED IN LACQUER THINNER.
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D. WASHED WITH DENATURED ALCOHOL.
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IN THE DRAWING BELOW, THE PARKING BRAKES ARE APPLIED BY: - ANS-A. AIR
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n PRESSURE AT POINT F. n n n
B. VACUUM IN AREA B.
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C. SPRING AT POINT C.
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D. PRESSURE IN AREA A. (NOT CORRECT AWNSER)
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WHAT IS THE PURPOSE OF A VACUUM BOOSTER? - ANS-A. TO DECREASE BRAKE PEDAL
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n EFFORT. (POSSIBLE CORRECT AWNSER) n n n
B. TO PREVENT FADE UNDER HEAVY BRAKING.
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C. TO PROVIDE ASSISTANCE WHEN THE ENGINE VACUUM IS LOW. (NOT CORRECT
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n AWNSER)
D. TO MAINTAIN UNIFORM PEDAL TRAVEL AS THE LININGS WEAR.
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THE TRAILER BRAKES DO NOT WORK. THE TRACTOR SYSTEM IS AT NORMAL
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n PRESSURE. THERE ARE NO LEAKS AND THE SERVICE AND EMERGENCY LINES ARE
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n HOOKED UP RIGHT. WHAT COULD CAUSE THIS PROBLEM? - ANS-A. ICE IN THE LINES
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n AT THE TRAILER.
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B. A BAD RELAY VALVE.
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C. A BAD SAFETY RELIEF VALVE.
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