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2025 Heavy Truck Brakes Michigan Mechanic Study Guide, Exams of Mechanical Engineering

School of Automotive MachinistsMechanical Engineering

This study guide provides a comprehensive set of multiple-choice questions and answers related to heavy truck brakes, specifically focusing on the michigan mechanic certification. The guide covers various aspects of truck brake systems, including engine brakes, air brake components, hydraulic brakes, and troubleshooting common brake issues. It is designed to help mechanics prepare for the michigan mechanic certification exam.

Typology: Exams

2024/2025

Available from 01/10/2025

lenah-smith
lenah-smith 🇺🇸

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2025 HEAVY TRUCK BRAKES MICHIGAN
MECHANIC STUDY GUIDE questions &correct
Answers already Graded A+
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)
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.
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.
IN THE 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)
WHAT IS THE PURPOSE OF A VACUUM BOOSTER?
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Download 2025 Heavy Truck Brakes Michigan Mechanic Study Guide and more Exams Mechanical Engineering in PDF only on Docsity!

MECHANIC STUDY GUIDE questions &correct

Answers already Graded A+

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)

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.

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.

IN THE 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)

WHAT IS THE PURPOSE OF A VACUUM BOOSTER?

MECHANIC STUDY GUIDE questions &correct

Answers already Graded A+

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.

THE TRAILER BRAKES DO NOT WORK. THE TRACTOR SYSTEM IS AT NORMAL PRESSURE. THERE ARE NO LEAKS AND THE

SERVICE AND EMERGENCY LINES ARE HOOKED UP RIGHT. WHAT COULD CAUSE THIS PROBLEM?

A. ICE IN THE LINES AT THE TRAILER.

B. A BAD RELAY VALVE.

C. A BAD SAFETY RELIEF VALVE.

D. BOTH A AND B. (CORRECT AWNSER)

THE RESIDUAL VALVE IN THE MASTER CYLINDER:

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:

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?

A. VALVE AT A WILL PROTECT THE PRESSURE IN THE DRY TANK.

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

MECHANIC STUDY GUIDE questions &correct

Answers already Graded A+

C. MOISTURE IN THE BRAKE FLUID.

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

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?

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?

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?

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:

A. POINT E.

B. POINT D.

C. POINT B.

MECHANIC STUDY GUIDE questions &correct

Answers already Graded A+

D. POINT A. (CORRECT AWNSER)

MOST ANTI-SKID BRAKING SYSTEMS OPERATE BY MODULATING THE BRAKES SIMULTANEOUSLY ON:

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:

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?

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?

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)

MECHANIC STUDY GUIDE questions &correct

Answers already Graded A+

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:

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:

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 HYDRAULIC SERVICE BRAKES WILL NOT RELEASE FULLY. WHAT SHOULD YOU DO FIRST?

A. CHECK THE MASTER CYLINDER FOR DEFECTS. (CORRECT AWNSER)

B. CHECK FOR A DEFECTIVE QUICK RELEASE VALVE.

C. RUN AN ENGINE VACUUM TEST.

D. CHECK THE BRAKE DRUMS.

IN THE SYSTEM SHOWN BELOW, AIR LEAKS FROM THE RELAY VALVE EXHAUST PORT ALL THE TIME. THE LIKELY CAUSE OF

THIS PROBLEM IS:

A. A LEAKY SEAL IN THE PART AT POINT D.

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

MECHANIC STUDY GUIDE questions &correct

Answers already Graded A+

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?

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:

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:

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)

WHAT SHOULD YOU DO FIRST BEFORE REPLACING THE DIAPHRAGM ON A SPRING BRAKE TYPE EMERGENCY BRAKE

CHAMBER?

A. COMPRESS THE SPRING BRAKE. (POSSIBLE CORRECT AWNSER)

B. BACK OFF THE SLACK ADJSUTER.

C. DISCONNECT THE PUSH ROD CLEVIS.

MECHANIC STUDY GUIDE questions &correct

Answers already Graded A+

WHAT IS THE PROPER LUBRICANT TO USE WHEN ASSEMBLING A WHEEL CYLINDER?

A. BRAKE FLUID. (CORRECT AWNSER)

B. OLEUM SPIRITS.

C. MINERAL OIL.

D. LITHIUM BASED GREASE.

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.

THE WEAR SLEEVE IS LOCATED:

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:

A. POINT E. (NOT CORRECT AWNSER)

B. POINT A.

C. POINT B.

D. POINT C. (POSSIBLE CORRECT AWNSER)

AN AIR OVER HYDRAULIC POWER CLUSTER:

MECHANIC STUDY GUIDE questions &correct

Answers already Graded A+

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:

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?

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?

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:

A. A FROZEN TWO-WAY CHECK VALVE.