HEAVY TRUCK BRAKES MICHIGAN MECHANIC STUDY GUIDE.pdf file:///C:/Users/HP/Desktop/New%20fo/HEAVY%20TRUCK%20B
HEAVY TRUCK BRAKES MICHIGAN MECHANIC
STUDY GUIDE
1. AN ENGINE BRAKE (JACOBS BRAKE): A. IS A SELF-ENERGIZING SERVO TYPE.
B. IS NORMALLY USED IN PLACE OF A SPRING BRAKE.
C. RESTRICTS THE INTAKE PORT AND CAUSES A BUILD UP OF 30-45 LBS OF
PRESSURE.
D. OPENS THE EXHAUST VALVES NEAR THE TOP OF THE COMPRESSION STROKE
TO RELEASE THE COMPRESSED AIR. (CORRECT AWNSER)
2. IN THE SYSTEM SHOWN BELOW,THE PART AT C IS:: A. AN INVERSION
VALVE. (POSSIBLE CORRECT AWNSER)
B. A SAFETY VALVE.
C. A MODULATOR VALVE. (NOT CORRECT AWNSER)
D. A RELAY VALVE.
3. A MECHANIC HAS REMOVED A BRAKE DRUM AND FOUND THE BRAKE
LININGS SOAKED WITH GREASE.THE BRAKE LININGS SHOULD BE:: A. RE-
PLACED. (CORRECT AWNSER)
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,HEAVY TRUCK BRAKES MICHIGAN MECHANIC STUDY GUIDE.pdf file:///C:/Users/HP/Desktop/New%20fo/HEAVY%20TRUCK%20B
B. SANDED TO ROUGHEN UP THE FRICTION SURFACE.
C. DIPPED IN LACQUER THINNER.
D. WASHED WITH DENATURED ALCOHOL.
4. INTHE DRAWING BELOW,THE PARKING BRAKES ARE APPLIED BY:: A.AIR
PRESSURE AT POINT F.
B. VACUUM IN AREA B.
C. SPRING AT POINT C.
D. PRESSURE IN AREA A. (NOT CORRECT AWNSER)
5. WHAT IS THE PURPOSE OF A VACUUM BOOSTER?: A. TO DECREASE BRAKE
PEDAL EFFORT. (POSSIBLE CORRECT AWNSER)
B. TO PREVENT FADE UNDER HEAVY BRAKING.
C. TO PROVIDE ASSISTANCE WHEN THE ENGINE VACUUM IS LOW. (NOT CORRECT
AWNSER)
D. TO MAINTAIN UNIFORM PEDAL TRAVEL AS THE LININGS WEAR.
6. THETRAILER BRAKES DO NOTWORK.THETRACTOR SYSTEM IS AT NOR- MAL
PRESSURE. THERE ARE NO LEAKS AND THE SERVICE AND EMER- GENCY LINES
ARE HOOKED UP RIGHT. WHAT COULD CAUSE THIS PROB- LEM?: A. ICE IN THE
LINES AT THE TRAILER.
B. A BAD RELAY VALVE.
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,HEAVY TRUCK BRAKES MICHIGAN MECHANIC STUDY GUIDE.pdf file:///C:/Users/HP/Desktop/New%20fo/HEAVY%20TRUCK%20B
C. A BAD SAFETY RELIEF VALVE.
D. BOTH A AND B. (CORRECT AWNSER)
7. THE RESIDUAL VALVE IN THE MASTER CYLINDER:: A. LIMITS PRESSURE BUILD
UP IN THE SYSTEM.
B. STOPS THE FLOW TO DAMAGED BRAKE LINES.
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