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HEAVY TRUCK BRAKES MICHIGAN MECHANIC STUDY GUIDE, Exams of Mechanics

Trafford CollegeMechanics

HEAVY TRUCK BRAKES MICHIGAN MECHANIC STUDY GUIDE

Typology: Exams

2024/2025

Available from 07/03/2025

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HEAVY TRUCK BRAKES MICHIGAN MECHANIC STUDY GUIDE
“AN ENGINE BRAKE (JACOBS BRAKE) - CORRECT ANSWER 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)"
"THE RESIDUAL VALVE IN THE MASTER CYLINDER: - CORRECT ANSWER A. LIMITS
PRESSURE BUILD UP IN THE SYSTEM.
B. STOPS THE FLOW TO DAMAGED BRAKE LINES.
C. KEEPS SOME PRESSURE IN THE SYTEM WHEN THE BRAKES ARE RELEASED. (CORRECT
AWNSER)
D. IS OPERATED BY ENGINE VACUUM."
"HIGHER THAN NORMAL AIR PRESSURE WOULD LIKELY BE CAUSED BY: - CORRECT
ANSWER A. A GOVENOR THAT IS BAD OR OUT OF ADJUSTMENT. (POSSIBLE CORRECT
AWNSER)
B. A PLUGGED SAFETY VALVE. (NOT CORRECT AWNSER)
C. A ONE-WAY CHECK VALVE STUCK OPEN.
D. A STICKY QUICK RELEASE VALVE."
"IF GLADHAND 2 IS UNHOOKED OR HAS A SEVERE LEAK, WHAT WILL HAPPEN DURING
OPERATION? - CORRECT ANSWER A. VALVE AT A WILL PROTECT THE PRESSURE IN THE
DRY TANK.
B. TRACTOR BRAKES WILL APPLY AUTOMATICALLY. (NOT CORRECT AWNSER)
C. VALVE AT C WILL APPLY TRAILER BRAKES.
D. VALVE AT B WILL APPLY TRAILER BRAKES."
"WITH THE ENGINE STOPPED, A MECHANIC HOLDS THE POWER BRAKE PEDAL IN THE
DEPRESSED POSITION. THE MECHANIC THE STARTS THE ENGINE WITH THE PEDAL STILL
DEPRESSED. THE PEDAL SINKS SLIGHTLY. WHAT DOES THIS INDICATE? - CORRECT
ANSWER A. THE BRAKE BOOSTER IS SATISFACTORY. (CORRECT AWNSER)
B. A LEAKING CHECK VALVE.
C. A TORN DIAPHRAGM.
D. A DEFECTIVE CONTROL VALVE ASSEMBLY."
"A MECHANIC FINDS GEAR LUBE INSIDE BOTH BRAKE DRUMS ON A DRIVING AXLE. WHAT IS
THE MOST LIKELY CAUSE OF THIS PROBLEM? - CORRECT ANSWER A. A BAD PINION SEAL.
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HEAVY TRUCK BRAKES MICHIGAN MECHANIC STUDY GUIDE

“AN ENGINE BRAKE (JACOBS BRAKE) - CORRECT ANSWER 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)"

"THE RESIDUAL VALVE IN THE MASTER CYLINDER: - CORRECT ANSWER A. LIMITS

PRESSURE BUILD UP IN THE SYSTEM.

B. STOPS THE FLOW TO DAMAGED BRAKE LINES.

C. KEEPS SOME PRESSURE IN THE SYTEM WHEN THE BRAKES ARE RELEASED. (CORRECT

AWNSER)

D. IS OPERATED BY ENGINE VACUUM."

"HIGHER THAN NORMAL AIR PRESSURE WOULD LIKELY BE CAUSED BY: - CORRECT

ANSWER A. A GOVENOR THAT IS BAD OR OUT OF ADJUSTMENT. (POSSIBLE CORRECT

AWNSER)

B. A PLUGGED SAFETY VALVE. (NOT CORRECT AWNSER)

C. A ONE-WAY CHECK VALVE STUCK OPEN.

D. A STICKY QUICK RELEASE VALVE."

"IF GLADHAND 2 IS UNHOOKED OR HAS A SEVERE LEAK, WHAT WILL HAPPEN DURING

OPERATION? - CORRECT ANSWER A. VALVE AT A WILL PROTECT THE PRESSURE IN THE

DRY TANK.

B. TRACTOR BRAKES WILL APPLY AUTOMATICALLY. (NOT CORRECT AWNSER)

C. VALVE AT C WILL APPLY TRAILER BRAKES.

D. VALVE AT B WILL APPLY TRAILER BRAKES."

"WITH THE ENGINE STOPPED, A MECHANIC HOLDS THE POWER BRAKE PEDAL IN THE

DEPRESSED POSITION. THE MECHANIC THE STARTS THE ENGINE WITH THE PEDAL STILL

DEPRESSED. THE PEDAL SINKS SLIGHTLY. WHAT DOES THIS INDICATE? - CORRECT

ANSWER A. THE BRAKE BOOSTER IS SATISFACTORY. (CORRECT AWNSER)

B. A LEAKING CHECK VALVE.

C. A TORN DIAPHRAGM.

D. A DEFECTIVE CONTROL VALVE ASSEMBLY."

"A MECHANIC FINDS GEAR LUBE INSIDE BOTH BRAKE DRUMS ON A DRIVING AXLE. WHAT IS

THE MOST LIKELY CAUSE OF THIS PROBLEM? - CORRECT ANSWER A. A BAD PINION SEAL.

B. A PLUGGED AXLE VENT. (CORRECT AWNSER)

C. A BAD WHEEL BEARING.

D. A BAD DIFFERENTIAL CASE SEAL."

"WHEN COMPLETING A BRAKE RELINE, WHAT BRAKE LINKAGE SHOULD THE MECHANIC

LUBRICATE? - CORRECT ANSWER A. THE ANCHOR PINS.

B. THE CAMSHAFTS. (POSSIBLE CORRECT AWNSER)

C. THE SLACK ADJUSTER. (NOT CORRECT AWNSER)

D. ALL OF THE ABOVE."

"IN THE SYSTEM SHOWN BELOW, A QUICK RELEASE VALVE WOULD BE NEEDED AT: -

CORRECT ANSWER A. POINT E.

B. POINT D.

C. POINT B.

D. POINT A. (CORRECT AWNSER)"

"WHICH ONE OF THESE SHOULD BE DONE MOST FREQUENTLY? - CORRECT ANSWER A.

ADJUST THE SPIDERS.

B. LUBRICATE THE "S" CAM.

C. CHECK THE BRAKE CHAMBERS FOR MOISTURE. (NOT CORRECT AWNSER)

D. CHECK THE BRAKE CHAMBER PUSH ROD TRAVEL. (POSSIBLE CORRECT AWNSER)"

"AIR BRAKE LINES ARE MSOT OFTEN MADE OF: - CORRECT ANSWER A. BRASS AND

ALUMINUM.

B. STEELAND NYLON.

C. NYLON AND BRASS.

D. COPPER AND NYLON. (CORRECT AWNSER)"

"TO FIND LEAKS IN AIRLINE FITTINGS AND SERVICE CHAMBERS, YOU SHOULD USE: -

CORRECT ANSWER A. A HALIDE LEAK DETECTOR.

B. A VACUUM GAUGE. (NOT CORRECT AWNSER)

C. A BRAKE PRESSURE BLEEDER.

D. A SOAP SUDS MIXTURE. (POSSIBLE CORRECT AWNSER)"

"A LIKELY CAUSE OF GRABBING BRAKES ON A DRIVE AXLE WOULD BE: - CORRECT

ANSWER 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."

"THE WEAR SLEEVE IS LOCATED: - CORRECT ANSWER A. IN THE BRAKE DRUM. (NOT

CORRECT AWNSER)

B. IN THE CHAMBER HOUSING.

C. ON THE AXLE SPINDLE. (POSSIBLE CORRECT AWNSER)

D. IN THE HUB."

"IN THE TRACTOR TRAILER SYSTEM BELOW, THE TRACTOR PROTECTION VALVE IS AT: -

CORRECT ANSWER A. POINT E. (NOT CORRECT AWNSER)

B. POINT A.

C. POINT B.

D. POINT C. (POSSIBLE CORRECT AWNSER)"

"AN AIR OVER HYDRAULIC POWER CLUSTER: - CORRECT ANSWER A. CONSISTS OF AN AIR

RESERVOIR MOUNTED DIRECTLY OVER A HYDRAULIC RESERVOIR TO APPLY THE BRAKES IN

CASE OF A HYDRAULIC BRAKE FAILURE. (NOT CORRECT AWNSER)

B. USES A HYDRAUILIC BRAKE APPLICATION IN CASE OF AN AIR FAILURE.

C. USES AIR PRESSURE TO BOOST THE HYDRAULIC PRESSURE IN A BRAKE SYSTEM. (POSSIBLE

CORRECT AWNSER)

D. NONE OF THE ABOVE."

"THE AIR CHARGES THE TRAILER RESERVOIR IS SUPPLIED FROM THE MAIN RESERVOIR TO:

CORRECT ANSWER A. PART A, TO PART D, TO THE FOOT VALVE, TO PART E, TO PART C,

THEN THROUGH GLADHAND 2 TO PART B.

B. THE FOOT VALVE, TO PART D, TO PART C, THEN THROUGH GLADHAND 2 TO PART B.

C. VALVE E, TO PART C, TO PART B.

D. PART A, TO PART D, TO PART C, THEN THROYGH GLADHAND 1 TO PART B. (NOT CORRECT

AWNSER)"

"WITH THE AIR BRAKES IN THE APPLIED POSITION ON A TRACTOR TRAILER, WHAT IS AN

ACCEPTABLE AIR PRESSURE LOSS IN THE SYSTEM? - CORRECT ANSWER A. THE

PRESSURE SHOULD NOT DROP AT ALL IN PERIOD OF ONE MINUTE. (NOT CORRECT AWNSER)

B. 25 PSI/MINUTE.

C. 15 PSI/MINUTE.

D. 4 PSI/MINUTE. (POSSIBLE CORRECT AWNSER)"

"APPROXIMATELY WHAT AIR PRESSURE WILL BE REQUIRED ON A FAIL SAFEOR SPRING

BRAKE STYLE PARKING BRAKE TO HOLD OFF THE SPRING BRAKES? - CORRECT ANSWER

A. 120-150 PSI.

B. 10 PSI-15 PSI.

C. 60 PSI-80 PSI. (CORRECT AWNSER)

D. 5 PSI."

"THE AIR PRESSURE IN THE SYSTEM IS BELOW NORMAL, WHAT IS THE MOST LIEKLY CAUSE:

- CORRECT ANSWER A. A FROZEN TWO-WAY CHECK VALVE. B. A PLUGGED SAFETY VALVE. C. A DEFECTIVE COMPRESSOR GOVENOR. (POSSIBLE CORRECT AWNSER) D. ALL OF THE ABOVE. (NOT CORRECT AWNSER)" "IN AN "S" CAM BRAKE, THE CHAMBER PUSH ROD IS RETURNED TO ITS RELEASED POSITION

BY: - CORRECT ANSWER A. THE BRAKE CHAMBER DIAPHRAGM.

B. THE BRAKE SLACK ADJUSTERS.

C. A SPRING IN THE BRAKE CHAMBER. (CORRECT AWNSER)

D. AIR PRESSURE."

"A PULSATING BRAKE PEDAL IN A HYDRAULIC STSTEM CAN BE CAUSED BY: - CORRECT

ANSWER A. AN OUT-OF-ROUND DRUM. (CORRECT AWNSER)

B. A DEFECTIVE MASTER CYLINDER.

C. A DEFECTIVE COMBINATION VALVE.

D. A BAD VACUUM BOOSTER."

"THE EMERGENCY BRAKE LINE ON MOST TRAILERS IS INSTALLED: - CORRECT ANSWER

A. WITHOUT GLADHANDS.

B. AS TWO LINES, ONE ON EACH SIDE OF THE TRAILER. (NOT CORRECT AWNSER)

C. ON THE DRIVER SIDE OR LEFT SIDE. (POSSIBLE CORRECT AWNSER)

D. ON THE CURB OR RIGHT SIDE."

"IN THE SYSTEM SHOWN BELOW, THE PART AT C IS: - CORRECT ANSWER A. AN

INVERSION VALVE. (POSSIBLE CORRECT AWNSER)

B. A SAFETY VALVE.

C. A MODULATOR VALVE. (NOT CORRECT AWNSER)

D. A RELAY VALVE."

"A MECHANIC HAS REMOVED A BRAKE DRUM AND FOUND THE BRAKE LININGS SOAKED

WITH GREASE. THE BRAKE LININGS SHOULD BE: - CORRECT ANSWER A. REPLACED.

(CORRECT AWNSER)

B. SANDED TO ROUGHEN UP THE FRICTION SURFACE.

C. DIPPED IN LACQUER THINNER.

D. WASHED WITH DENATURED ALCOHOL."

"IN THE DRAWING BELOW, THE PARKING BRAKES ARE APPLIED BY: - CORRECT ANSWER

A. AIR PRESSURE AT POINT F.

B. VACUUM IN AREA B.

C. SPRING AT POINT C.

D. PRESSURE IN AREA A. (NOT CORRECT AWNSER)"

D. ALL OF THE ABOVE. (NOT CORRECT AWNSER)"

"MOST ANTI-SKID BRAKING SYSTEMS OPERATE BY MODULATING THE BRAKES

SIMULTANEOUSLY ON: - CORRECT ANSWER A. OPPOSITE CORNERS OF THE VEHICLE.

B. NON-DRIVING AXLES ONLY.

C. THE SAME AXLE. (CORRECT AWNSER)

D. THE SAME SIDE OF THE VEHICLE."

"WITH THE BRAKES FULLY APPLIED AND PROPERLY ADJSUTED, THE ANGLE BETWEEN THE

PUSHROD AND SLACK ADJUSTER SHOULD NOT BE MORE THAN: - CORRECT ANSWER A.

30 DEGREES.

B. 45 DEGREES. (NOT CORRECT AWNSER)

C. 90 DEGREES. (CORRECT AWNSER)

D. 60 DEGREES."

"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? -

CORRECT ANSWER A. EXTREME PEDAL SENSITIVITY.

B. EXCESSIVE PEDAL TRAVEL.

C. EXCESSIVE BRAKE FLUID LOSS.

D. BOTH A AND B. (CORRECT AWNSER)"

"WHAT IS THE FUNCTION OF THE INVERSION VALVE USED ON A STRAIGHT TRUCK WITH

DUAL AIR BRAKE SYSTEM? - CORRECT ANSWER A. IT ALLOWS A MODULATED SPRING

BRAKE APPLICATION ON THE REAR AXLE IF AIR PRESSURE IS APPLIED TO IT.

B. IT PREVENTS THE SPRING BRAKE FROM APPLYING DURING PERIODS OF LOW AIR

PRESSURE BECAUSE OF A PANIC STOP.

C. IT REVERSES THE SIRECTION OF THE AIR IN THE PRIMARY SYSTEM TO HELP RELEASE THE

BRAKES.

D. IT ALLOWS A MODULATED SPRING BRAKE APPLICATION IN AN AIR LOSS OCCURS IN THE

PRIMARY PORTION OF THE SYSTEM. (CORRECT AWNSER)"

"THE UNIT SHOWN BELOW IS: - CORRECT ANSWER A. AN ANTI-SKID RELAY EMERGENCY

VALVE.

B. A SPRING BRAKE CHAMBER.

C. A VACUUM BOOSTER. (CORRECT AWNSER)

D. A SEQUECE/PRIORITY VALVE."

"WHICH OF THE FOLLOWING WILL NOT CAUSE BRAKE CHATTER? - CORRECT ANSWER A.

WORN ANCHOR PIN HOLES IN SHOES.

B. A STICKY OR RUSTY GOVENOR PISTON. (POSSIBLE CORRECT AWNSER)

C. WORN CAM BUSHINGS.

D. LOOSE WHEEL BEARINGS. (NOT CORRECT AWNSER)"

"A MECHANIC FINDS THAT THE BRAKE LINING IS WORN VERY MUCH NEAR THE EDGE.

WHAT WOULD CAUSE THIS TO HAPPEN? - CORRECT ANSWER 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)"

"IN THE SYSTEM SHOWN BELOW, AIR LEAKS FROM THE RELAY VALVE EXHAUST PORT ALL

THE TIME. THE LIKELY CAUSE OF THIS PROBLEM IS: - CORRECT ANSWER A. A LEAKY

SEAL IN THE PART AT POINT D.

B. A LEAKY SEAL IN THE PART AT POINT C. (CORRECT AWNSER)

C. A LEAKY SEAL IN THE PART AT POINT E.

D. A LEKAY SEAL IN THE PART AT POINT 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)"

"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)

B. REPLACE THE CHECK VALVE.

C.REPLACE THE BOOSTER.

D. ALL OF THE ABOVE. (NOT CORRECT AWNSER)"

"HYDRAULIC BRAKE LINES ARE MADE OF: - CORRECT ANSWER A. ALUMINUM.

B. REINFORCED BRASS.

C. SEAMLESS COPPER TUBING.