HEAVY TRUCK BRAKES MICHIGAN MECHANIC STUDY GUIDE EXAM
2026|2027 UPDATED QUESTIONS WITH DETAILED VERIFIED ANSWERS
(100%) | ALREADY GRADED A+
IN THE DRAWING BELOW, THE DIAPHRAGM AT POINT E HAS FAILED. WHAT MUST YOU DO BEFORE MOVING THE
TRUCK? - CORRECT ANSWER -A. COMPRESS THE SPRING AT POINT D. (NOT CORRECT AWNSER)
B. APPLY AIR PRESSURE TO POINT F.
C. COMPRESS THE SPRING AT POINT F.
D. RELEASE AIR PRESSURE AT AREA B.
IN THE DRAWING BELOW: - CORRECT ANSWER -A. THE PARKING BRAKES ARE APPLIED AND THE SERVICE
BRAKES ARE RELEASED.
B. BOTH PARKING AND SERVICE BRAKES ARE RELEASED.
C. THE SERVICE BRAKES ARE APPLIED AND THE PARKING BRAKES ARE RELEASED.
D. BOTH PARKING AND SERVICE BRAKES ARE APPLIED. (NOT CORRECT AWNSER)
THE TRAILER BRAKES DO NOT RELEASE PROPERLY. THE AIR PRESSUREIS NORMAL AND THE EMERGENCY
SERVICE LINES ARE HOOKED UP PROPERLY. THE PROBLEM COULD BE CAUSED BY: - CORRECT ANSWER -A.
DRY OR BINDING CAM BUSHINGS.
B. A BAD RELAY EMERGENCY VALVE.
C. A FOOT VALVE NOT RETURNING TO A FULLY RELEASED POSITION.
D. ALL OF THE ABOVE. (CORRECT AWNSER)
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, WHAT SHOULD YOU DO FIRST BEFORE REPLACING THE DIAPHRAGM ON A SPRING BRAKE TYPE EMERGENCY
BRAKE CHAMBER? - CORRECT ANSWER -A. COMPRESS THE SPRING BRAKE. (POSSIBLE CORRECT AWNSER)
B. BACK OFF THE SLACK ADJSUTER.
C. DISCONNECT THE PUSH ROD CLEVIS.
D. COMPRESS THE DIAPHRAGM RETURN SPRING. (NOT CORRECT AWNSER)
CAM ACTUATED BRAKE SHOES ARE FOUND TO BE MAKING ONLY PARTIAL CONTACT WITH THE DRUM. TO
CORRECT THIS CONDITION, ADJUSTMENT SHOULD BE MADE TO THE: - CORRECT ANSWER -A. ACTUATOR
CABLE.
B. APPLYING WEDGE.
C. ECCENTRIC ANCHOR PINS. (CORRECT AWNSER)
D. ROLLER FOLLOWER.
WATER SHOULD BE DRAINED FROM AIR RESERVOIRS: - CORRECT ANSWER -A. BEFORE ADJUSTING SLACK
ADJUSTERS.
B. DAILY OR MORE FREQUENTLY IN COLD OR MOIST WEATHER. (CORRECT AWNSER)
C. BEFORE ANY ATTEMPT IS MADE TO REPLACE A SERVICE CHAMBER DIAPHRAGM.
D. TO EXPEL EXCESS OIL PASSED BY THE AIR PUMP.
A MECHANIC FINDS THAT THE VACUUM HOSE HOOKS UP TO THE POWER BOOSTER HAS COLLAPSED. WHAT
SHOULD THE MECHANIC DO? - CORRECT ANSWER -A. REPLACE THE HOSE. (POSSIBLE CORRECT AWNSER)
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2026|2027 UPDATED QUESTIONS WITH DETAILED VERIFIED ANSWERS
(100%) | ALREADY GRADED A+
IN THE DRAWING BELOW, THE DIAPHRAGM AT POINT E HAS FAILED. WHAT MUST YOU DO BEFORE MOVING THE
TRUCK? - CORRECT ANSWER -A. COMPRESS THE SPRING AT POINT D. (NOT CORRECT AWNSER)
B. APPLY AIR PRESSURE TO POINT F.
C. COMPRESS THE SPRING AT POINT F.
D. RELEASE AIR PRESSURE AT AREA B.
IN THE DRAWING BELOW: - CORRECT ANSWER -A. THE PARKING BRAKES ARE APPLIED AND THE SERVICE
BRAKES ARE RELEASED.
B. BOTH PARKING AND SERVICE BRAKES ARE RELEASED.
C. THE SERVICE BRAKES ARE APPLIED AND THE PARKING BRAKES ARE RELEASED.
D. BOTH PARKING AND SERVICE BRAKES ARE APPLIED. (NOT CORRECT AWNSER)
THE TRAILER BRAKES DO NOT RELEASE PROPERLY. THE AIR PRESSUREIS NORMAL AND THE EMERGENCY
SERVICE LINES ARE HOOKED UP PROPERLY. THE PROBLEM COULD BE CAUSED BY: - CORRECT ANSWER -A.
DRY OR BINDING CAM BUSHINGS.
B. A BAD RELAY EMERGENCY VALVE.
C. A FOOT VALVE NOT RETURNING TO A FULLY RELEASED POSITION.
D. ALL OF THE ABOVE. (CORRECT AWNSER)
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, WHAT SHOULD YOU DO FIRST BEFORE REPLACING THE DIAPHRAGM ON A SPRING BRAKE TYPE EMERGENCY
BRAKE CHAMBER? - CORRECT ANSWER -A. COMPRESS THE SPRING BRAKE. (POSSIBLE CORRECT AWNSER)
B. BACK OFF THE SLACK ADJSUTER.
C. DISCONNECT THE PUSH ROD CLEVIS.
D. COMPRESS THE DIAPHRAGM RETURN SPRING. (NOT CORRECT AWNSER)
CAM ACTUATED BRAKE SHOES ARE FOUND TO BE MAKING ONLY PARTIAL CONTACT WITH THE DRUM. TO
CORRECT THIS CONDITION, ADJUSTMENT SHOULD BE MADE TO THE: - CORRECT ANSWER -A. ACTUATOR
CABLE.
B. APPLYING WEDGE.
C. ECCENTRIC ANCHOR PINS. (CORRECT AWNSER)
D. ROLLER FOLLOWER.
WATER SHOULD BE DRAINED FROM AIR RESERVOIRS: - CORRECT ANSWER -A. BEFORE ADJUSTING SLACK
ADJUSTERS.
B. DAILY OR MORE FREQUENTLY IN COLD OR MOIST WEATHER. (CORRECT AWNSER)
C. BEFORE ANY ATTEMPT IS MADE TO REPLACE A SERVICE CHAMBER DIAPHRAGM.
D. TO EXPEL EXCESS OIL PASSED BY THE AIR PUMP.
A MECHANIC FINDS THAT THE VACUUM HOSE HOOKS UP TO THE POWER BOOSTER HAS COLLAPSED. WHAT
SHOULD THE MECHANIC DO? - CORRECT ANSWER -A. REPLACE THE HOSE. (POSSIBLE CORRECT AWNSER)
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