Heavy Truck Brakes Michigan Mechanics Study Guide Exam with Questions and
Answers – 100% Solved
A COMPRESSOR MAY NOT UNLOAD BECAUSE: - ✔✔✔-A. THE UNLOADER IS BINDING OR STUCK.
(CORRECT AWNSER)
B. THE EXHAUST VALVES ARE LEAKY OR STUCK OPEN.
C. THE DOUBLE CHECK VALVE IS STUCK.
D. THE INLET AIR FILTER IS PLUGGED.
A LIKELY CAUSE OF GRABBING BRAKES ON A DRIVE AXLE WOULD BE: - ✔✔✔-A. A BAD QUICK
RELEASE VALVE. (NOT CORRECT AWNSER)
B. BRAKES ADJUSTED TOO TIGHT. (POSSIBLE CORRECT AWNSER)
C. GREASE OR GEAR LUBE ON LININGS.
D. WEAK SHOE RETURN SPRINGS.
A MECHANIC FINDS GEAR LUBE INSIDE BOTH BRAKE DRUMS ON A DRIVING AXLE. WHAT IS THE
MOST LIKELY CAUSE OF THIS PROBLEM? - ✔✔✔-A. A BAD PINION SEAL.
B. A PLUGGED AXLE VENT. (CORRECT AWNSER)
C. A BAD WHEEL BEARING.
D. A BAD DIFFERENTIAL CASE SEAL.
A MECHANIC FINDS THAT THE BRAKE LINING IS WORN VERY MUCH NEAR THE EDGE. WHAT
WOULD CAUSE THIS TO HAPPEN? - ✔✔✔-A. BELL MOUTHED BRAKE DRUMS.
B. WORN-OUT ANCHOR PIN HOLES IN THE BRAKE SHOE.
C. A BENT BRAKE SHOE WEB.
D. ALL OF THE ABOVE. (CORRECT AWNSER)
A MECHANIC FINDS THAT THE VACUUM HOSE HOOKS UP TO THE POWER BOOSTER HAS
COLLAPSED. WHAT SHOULD THE MECHANIC DO? - ✔✔✔-A. REPLACE THE HOSE. (POSSIBLE
CORRECT AWNSER)
, Heavy Truck Brakes Michigan Mechanics Study Guide Exam with Questions and
Answers – 100% Solved
B. REPLACE THE CHECK VALVE.
C.REPLACE THE BOOSTER.
D. ALL OF THE ABOVE. (NOT CORRECT AWNSER)
A MECHANIC HAS REMOVED A BRAKE DRUM AND FOUND THE BRAKE LININGS SOAKED WITH
GREASE. THE BRAKE LININGS SHOULD BE: - ✔✔✔-A. REPLACED. (CORRECT AWNSER)
B. SANDED TO ROUGHEN UP THE FRICTION SURFACE.
C. DIPPED IN LACQUER THINNER.
D. WASHED WITH DENATURED ALCOHOL.
A MECHANIC IS REPLACING A MASTER CYLINDER. THE PUSH ROD (SEE BELOW) IS ACCIDENTALLY
PULLED OUT AND PART X FALLS OUT OF PLACE. WHAT WILL CAUSE THIS? - ✔✔✔-A. EXTREME
PEDAL SENSITIVITY.
B. EXCESSIVE PEDAL TRAVEL.
C. EXCESSIVE BRAKE FLUID LOSS.
D. BOTH A AND B. (CORRECT AWNSER)
A PULSATING BRAKE PEDAL IN A HYDRAULIC STSTEM CAN BE CAUSED BY: - ✔✔✔-A. AN OUT-
OF-ROUND DRUM. (CORRECT AWNSER)
B. A DEFECTIVE MASTER CYLINDER.
C. A DEFECTIVE COMBINATION VALVE.
D. A BAD VACUUM BOOSTER.
AIR BRAKE LINES ARE MSOT OFTEN MADE OF: - ✔✔✔-A. BRASS AND ALUMINUM.
B. STEELAND NYLON.
C. NYLON AND BRASS.
D. COPPER AND NYLON. (CORRECT AWNSER)
Answers – 100% Solved
A COMPRESSOR MAY NOT UNLOAD BECAUSE: - ✔✔✔-A. THE UNLOADER IS BINDING OR STUCK.
(CORRECT AWNSER)
B. THE EXHAUST VALVES ARE LEAKY OR STUCK OPEN.
C. THE DOUBLE CHECK VALVE IS STUCK.
D. THE INLET AIR FILTER IS PLUGGED.
A LIKELY CAUSE OF GRABBING BRAKES ON A DRIVE AXLE WOULD BE: - ✔✔✔-A. A BAD QUICK
RELEASE VALVE. (NOT CORRECT AWNSER)
B. BRAKES ADJUSTED TOO TIGHT. (POSSIBLE CORRECT AWNSER)
C. GREASE OR GEAR LUBE ON LININGS.
D. WEAK SHOE RETURN SPRINGS.
A MECHANIC FINDS GEAR LUBE INSIDE BOTH BRAKE DRUMS ON A DRIVING AXLE. WHAT IS THE
MOST LIKELY CAUSE OF THIS PROBLEM? - ✔✔✔-A. A BAD PINION SEAL.
B. A PLUGGED AXLE VENT. (CORRECT AWNSER)
C. A BAD WHEEL BEARING.
D. A BAD DIFFERENTIAL CASE SEAL.
A MECHANIC FINDS THAT THE BRAKE LINING IS WORN VERY MUCH NEAR THE EDGE. WHAT
WOULD CAUSE THIS TO HAPPEN? - ✔✔✔-A. BELL MOUTHED BRAKE DRUMS.
B. WORN-OUT ANCHOR PIN HOLES IN THE BRAKE SHOE.
C. A BENT BRAKE SHOE WEB.
D. ALL OF THE ABOVE. (CORRECT AWNSER)
A MECHANIC FINDS THAT THE VACUUM HOSE HOOKS UP TO THE POWER BOOSTER HAS
COLLAPSED. WHAT SHOULD THE MECHANIC DO? - ✔✔✔-A. REPLACE THE HOSE. (POSSIBLE
CORRECT AWNSER)
, Heavy Truck Brakes Michigan Mechanics Study Guide Exam with Questions and
Answers – 100% Solved
B. REPLACE THE CHECK VALVE.
C.REPLACE THE BOOSTER.
D. ALL OF THE ABOVE. (NOT CORRECT AWNSER)
A MECHANIC HAS REMOVED A BRAKE DRUM AND FOUND THE BRAKE LININGS SOAKED WITH
GREASE. THE BRAKE LININGS SHOULD BE: - ✔✔✔-A. REPLACED. (CORRECT AWNSER)
B. SANDED TO ROUGHEN UP THE FRICTION SURFACE.
C. DIPPED IN LACQUER THINNER.
D. WASHED WITH DENATURED ALCOHOL.
A MECHANIC IS REPLACING A MASTER CYLINDER. THE PUSH ROD (SEE BELOW) IS ACCIDENTALLY
PULLED OUT AND PART X FALLS OUT OF PLACE. WHAT WILL CAUSE THIS? - ✔✔✔-A. EXTREME
PEDAL SENSITIVITY.
B. EXCESSIVE PEDAL TRAVEL.
C. EXCESSIVE BRAKE FLUID LOSS.
D. BOTH A AND B. (CORRECT AWNSER)
A PULSATING BRAKE PEDAL IN A HYDRAULIC STSTEM CAN BE CAUSED BY: - ✔✔✔-A. AN OUT-
OF-ROUND DRUM. (CORRECT AWNSER)
B. A DEFECTIVE MASTER CYLINDER.
C. A DEFECTIVE COMBINATION VALVE.
D. A BAD VACUUM BOOSTER.
AIR BRAKE LINES ARE MSOT OFTEN MADE OF: - ✔✔✔-A. BRASS AND ALUMINUM.
B. STEELAND NYLON.
C. NYLON AND BRASS.
D. COPPER AND NYLON. (CORRECT AWNSER)
