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HEAVY TRUCK BRAKES MICHIGAN MECHANIC STUDY GUIDE QUESTIONS & ANSWERS 2024 ( A+ GRADED 100% VERIFIED) £7.59
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HEAVY TRUCK BRAKES MICHIGAN MECHANIC STUDY GUIDE QUESTIONS & ANSWERS 2024 ( A+ GRADED 100% VERIFIED)
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  • Module
  • HEAVY TRUCK BRAKES MICHIGAN MECHANIC
  • Institution
  • HEAVY TRUCK BRAKES MICHIGAN MECHANIC

HEAVY TRUCK BRAKES MICHIGAN MECHANIC STUDY GUIDE QUESTIONS & ANSWERS 2024 ( A+ GRADED 100% VERIFIED)

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Document information

  • July 26, 2024
  • 8
  • 2023/2024
  • Exam (elaborations)
  • Questions & answers

Subjects

  • heavy truck brakes
  • heavy truck brakes michigan mechanic study guide q
  • heavy truck brakes michigan mechanic study
  • heavy truck brakes michigan mechanic s exam

Written for

  • HEAVY TRUCK BRAKES MICHIGAN MECHANIC
All documents for this subject (19)

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HEAVY TRUCK BRAKES MICHIGAN MECHANIC STUDY GUIDE
QUESTIONS & ANSWERS 2024 ( A+ GRADED 100% VERIFIED)

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 answer)
2. In the system shown below, the part at c is:: a. An inversion valve. (possible
correct answer) b. A safety valve.
C. A modulator valve. (not correct answer)
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 answer)
B. Sanded to roughen up the friction surface.
C. Dipped in lacquer thinner.
D. Washed with denatured alcohol.
4. 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 answer)
5. What is the purpose of a vacuum booster?: a. To decrease brake pedal effort.
(possible correct answer) b. To prevent fade under heavy braking.
C. To assist when the engine vacuum is low. (not
Correct answer)
D. To maintain uniform pedal travel as the linings wear.
6. 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 answer)
7. 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 system when the brakes are re-


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, Leased. (correct answer)
D. Is operated by engine vacuum.
8. Higher than normal air pressure would likely be caused by:: a. A govenor that is
bad or out of adjustment. (possible correct
Answer)
B. A plugged safety valve. (not correct answer)
C. A one-way check valve stuck open.
D. A sticky quick-release valve.
9. If gladhand 2 is unhooked or has a severe leak, what will happen during the
operation?: a. Valve at a will protect the pressure in the dry tank.
B. Tractor brakes will apply automatically. (not correct answer)
C. Valve at c will apply trailer brakes.
D. Valve at b will apply trailer brakes.
10. During a hard stop, one brake has locked on a trailer with
"s" cam brakes. The service and emergency lines are hooked up properly and the
system is at normal pressure but the brakes will not release. What is the likely cause
of this problem?: a.
The service brake chamber diaphragm has split. (possible cor-
Rect answer)
B. The cam has rolled over due to too much lining wear.
C. The anti-lock module has burned out at the sending unit. (not
Correct answer)
D. The chamber spring has rusted and is broken.
11. Too much effort is required on the brake pedal to stop a truck with a vacuum
booster. What is the likely cause of this problem?: a. Seized automatic adjusters.
B. Glazed linings
C. A defective modulator valve. (not correct answer)
D. Very high engine vacuum. (possible correct answer)
12. With the valve pictured below, the operator can:: a. Apply the tractor brakes by
spring pressure. (not correct awnser) b. Apply the trailer brakes by air pressure.
C. Engage or disengage the parking brakes.
D. Apply the trailer brakes with spring pressure.
13. It is found that the rubber diaphragm in a master cylinder
The cover is swollen to nearly double in size. This could be caused by:: a.
Contamination of the brake fluid with engine oil. (possible
Correct answer)


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