Disc Brakes - Post

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Disc Brakes - Post - Quiz

Chapter 32


Questions and Answers
  • 1. 

    Once all of the lug nuts have been torqued, go around them again, this time in a _______________ to ensure that you did not miss any in the previous pattern.

    • A.

      Star pattern

    • B.

      Circular pattern

    • C.

      Alternating pattern

    • D.

      None of the above

    Correct Answer
    A. Star pattern
    Explanation
    Always use a star pattern to ensure the wheel is uniformly tightened to the hub.

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  • 2. 

    When installing wheels on a vehicle that a technician just finished servicing, the technician should use a(n) __________________________ to tighten each wheel lug nut.

    • A.

      Impact gun

    • B.

      Air ratchet

    • C.

      Torque wrench

    • D.

      None of the above

    Correct Answer
    C. Torque wrench
    Explanation
    The torque wrench ensures each lug is tightened exactly as much as each other lug.

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  • 3. 

    When inspecting wheel studs for damage, a technician should look for which of the following?

    • A.

      Necked-down or thinned-out sections

    • B.

      Cross-threading

    • C.

      Seizing of the lug nut on the stud

    • D.

      All of the above

    Correct Answer
    D. All of the above
    Explanation
    Each of these are examples of how a stud could be damaged.

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  • 4. 

    Which of the following is a typical disc rotor?

    • A.

      Hub-style

    • B.

      Hubless-style

    • C.

      Both A and B

    • D.

      None of the above

    Correct Answer
    C. Both A and B
    Explanation
    Disc rotors are available in both a hub and hubless-style configuration.

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  • 5. 

    Removing the rotor is usually required when the rotor:

    • A.

      Is under the specified minimum thickness.

    • B.

      Would be under the minimum thickness after machining.

    • C.

      Both A and B

    • D.

      None of the above

    Correct Answer
    C. Both A and B
    Explanation
    The rotor would need to be replaced in both of these circumstances.

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  • 6. 

    True or False. Disc rotors and drums can be refinished while on the vehicle or off the vehicle

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    Drums can not be refinished while they remain installed.

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  • 7. 

    True or False. Rotors that are too thin cannot handle as much heat and will experience brake fade.

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    Rotors that are too thin do not have the same mass as those that are thicker. As a result, they hold onto more heat and fade is experienced.

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  • 8. 

    Excessive brake disc rotor thickness variation will cause:

    • A.

      Steering wheel shimmy.

    • B.

      A brake surging feeling.

    • C.

      Both A and B

    • D.

      None of the above

    Correct Answer
    C. Both A and B
    Explanation
    Excessive thickness variation will cause surging and may lead to a shimmy in the steering wheel.

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  • 9. 

    Which of the following is a type of disc brake pad wear indicator?

    • A.

      Scratcher type

    • B.

      Sensor type

    • C.

      Both A and B

    • D.

      None of the above

    Correct Answer
    C. Both A and B
    Explanation
    Both of these are options for brake pad wear indication.

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  • 10. 

    True or False. Retracting the caliper piston on an integrated parking brake system is different than on a standard caliper.

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    A special tool is required when retracting a piston on a caliper with an integrated parking brake.

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  • 11. 

    Which of the following can cause brake pedal pulsation?

    • A.

      Rotors with excessive lateral run out

    • B.

      Anti-lock braking system operation

    • C.

      Both A and B

    • D.

      None of the above

    Correct Answer
    C. Both A and B
    Explanation
    Both of these will cause brake pedal pulsation, but when the ABS operates, it's considered normal.

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  • 12. 

    True or False. Pinching off the flexible brake hoses with vice grip pliers is a recommended method of closing rubber brake lines.

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    No, vise grips are way too aggressive to install on a brake hose.

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  • 13. 

    If the ________________ anti-lock braking system warning lamp illuminates, it typically means the vehicle's power train control module has observed a fault in the anti-lock brake system and will need to be checked for diagnostic trouble codes.

    • A.

      Red

    • B.

      Blue

    • C.

      Yellow

    • D.

      None of the above

    Correct Answer
    C. Yellow
    Explanation
    The ABS warning light is most often yellow. It is a less threatening situation for the vehicle occupants, than low brake fluid.

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  • 14. 

    Disc brake rotors with holes or slots machined into their surface can help:

    • A.

      Dissipate heat more quickly.

    • B.

      Remove water more quickly

    • C.

      Both A and B

    • D.

      None of the above

    Correct Answer
    C. Both A and B
    Explanation
    Slotted and drilled will help with both heat removal and water removal, but it reduces the friction area of the pad with the rotor.

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  • 15. 

    In a disc brake system, the dust shields help control which of the following?

    • A.

      Dust

    • B.

      Water

    • C.

      Road debris

    • D.

      All of the above

    Correct Answer
    D. All of the above
    Explanation
    The dust shield will help is keep all of these contaminates from the disc braking system.

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  • 16. 

    Tech A says that when the brake pedal is depressed, a push rod creates the hydraulic pressure in the disc brake system. Tech B says that when the brake pedal is depressed, a push rod transfers the force through a brake booster to a hydraulic master cylinder. Who is correct? 

    • A.

      Tech A

    • B.

      Tech B

    • C.

      Both Techs A and B

    • D.

      Neither Tech A nor B

    Correct Answer
    B. Tech B
    Explanation
    The push rod does not create hydraulic force. It is merely an intermediate component, responsible for transferring force to the remaining brake system.

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  • 17. 

    All of the following are disadvantages of disc brake systems, EXCEPT:

    • A.

      Water dissipation.

    • B.

      Rotor warpage.

    • C.

      Squeals.

    • D.

      Squeaks.

    Correct Answer
    A. Water dissipation.
    Explanation
    Water dissipation is an advantage of the disc braking system.

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  • 18. 

    Tech A says that fixed calipers are rigidly bolted in place and cannot move or slide. Tech B says that the sliding or floating caliper has brake pads located on each side of the rotor, but all the pistons are on only one side, usually the inside of the rotor. Who is correct?

    • A.

      Tech A

    • B.

      Tech B

    • C.

      Both Techs A and B

    • D.

      Neither Tech A nor B

    Correct Answer
    C. Both Techs A and B
    Explanation
    Fixed calipers are rigidly bolted in place. Sliding calipers do only have one piston.

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  • 19. 

    All of the following are types of disc brake calipers, EXCEPT:

    • A.

      Rotating caliper.

    • B.

      Fixed caliper

    • C.

      Floating caliper.

    • D.

      Sliding caliper.

    Correct Answer
    A. Rotating caliper.
    Explanation
    Rotating calipers do not exist.

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  • 20. 

    Tech A says that in disc brake calipers, the piston is sealed by a stationary round section sealing ring, also called a round cut O-ring. Tech B says that in disc brake calipers, the piston is sealed by a stationary square section sealing ring, also called a square cut O-ring. Who is correct?

    • A.

      Tech A

    • B.

      Tech B

    • C.

      Both Techs A and B

    • D.

      Neither Tech A nor B

    Correct Answer
    B. Tech B
    Explanation
    The seal for the piston is a stationary, square cut seal.

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  • 21. 

    Tech A says that manufacturers have dealt with caliper brake piston corrosion by making pistons out of a phenolic resin. Tech B says that even though the phenolic pistons themselves do not corrode, the cast iron bore of the caliper does corrode and rust, and can therefore cause a phenolic piston to seize in the bore. Who is correct?

    • A.

      Tech A

    • B.

      Tech B

    • C.

      Both Techs A and B

    • D.

      Neither Tech A nor B

    Correct Answer
    C. Both Techs A and B
    Explanation
    Phenolic pistons will not corrode. Only the caliper cavity will.

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  • 22. 

    Which of the following is/are LEAST likely to be used to reduce disc brake squeal?

    • A.

      Shims

    • B.

      Spacers

    • C.

      Axle grease

    • D.

      Bendable tangs

    Correct Answer
    C. Axle grease
    Explanation
    Axel grease is not used on braking components.

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  • 23. 

    Tech A says that burnishing the new brake pads results in longer brake pad life. Tech B says that burnishing the new brake pads results in quiet brake life. Who is correct?

    • A.

      Tech A

    • B.

      Tech B

    • C.

      Both Techs A and B

    • D.

      Neither Tech A nor B

    Correct Answer
    C. Both Techs A and B
    Explanation
    Burnishing pads will help extend pad life and to reduce potential noise.

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  • 24. 

    Tech A says that a wheel stud that shows signs of cross-threaded lug nuts should be rethreaded with a die and put back in service. Tech B says that a wheel stud that shows signs of cross-threaded lug nuts should be replaced. Who is correct?

    • A.

      Tech A

    • B.

      Tech B

    • C.

      Both Techs A and B

    • D.

      Neither Tech A nor B

    Correct Answer
    B. Tech B
    Explanation
    If found to be damaged, wheel studs and lugs should never be reused or repaired.

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  • 25. 

    Tech A says that the piston on a brake caliper that integrates the parking brake will need to be screwed back in on the threaded shaft to retract it into the bore. Tech B says that you need a special tool that mates to slots, grooves, or holes in the outer face of the caliper piston. Who is correct?

    • A.

      Tech A

    • B.

      Tech B

    • C.

      Both Techs A and B

    • D.

      Neither Tech A nor B

    Correct Answer
    C. Both Techs A and B
    Explanation
    A special tool is required to push the piston back in and it does line up with the grooves in the face of the caliper piston.

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  • 26. 

    Parking brakes use a _______________________ to maintain tension on the parking brake cables and assembly when applied.

    • A.

      Ratcheting mechanism

    • B.

      Scrum mechanism

    • C.

      Both A and B

    • D.

      None of the above

    Correct Answer
    A. Ratcheting mechanism
    Explanation
    Parking brakes use a ratcheting mechanism to maintain tension on the parking brake cables and assembly when applied. This mechanism allows the brake to stay engaged even when pressure is released, preventing the vehicle from rolling or moving. The ratcheting mechanism locks the brake in place, ensuring that it remains engaged until intentionally released.

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  • 27. 

    The amount of friction between two moving faces in contact with each other is expressed as a ratio and is called:

    • A.

      Friction.

    • B.

      The coefficient of friction.

    • C.

      The coefficient of heat.

    • D.

      None of the above

    Correct Answer
    B. The coefficient of friction.
    Explanation
    The amount of friction between two moving faces in contact with each other is expressed as a ratio and is called the coefficient of friction. This ratio represents the force required to overcome the friction between the two surfaces. It is a dimensionless quantity that varies depending on the nature of the surfaces in contact and the presence of any lubricants. The coefficient of friction is an important concept in physics and engineering as it helps in understanding and predicting the behavior of objects in contact with each other.

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  • 28. 

    Excessive braking can cause which of the following brake conditions?

    • A.

      Warped brake rotors

    • B.

      Warped brake drums

    • C.

      Brake fade

    • D.

      All of the above

    Correct Answer
    D. All of the above
    Explanation
    Excessive braking can cause various brake conditions such as warped brake rotors, warped brake drums, and brake fade. When brakes are applied too forcefully or for prolonged periods, the intense heat generated can cause the rotors or drums to warp, resulting in uneven braking and vibrations. Additionally, excessive braking can lead to brake fade, where the brakes lose their effectiveness due to overheating and reduced friction between the brake pads and rotors/drums. Therefore, all of the mentioned brake conditions can occur as a result of excessive braking.

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  • 29. 

    Tech A says that disc brakes are used on the front of most vehicles built since the early 1970s and on the rear wheels of many vehicles. Tech B says that a disc brake operates by squeezing brake pads on both sides of a rotor or disc that is attached to the wheel. Who is correct?

    • A.

      Tech A

    • B.

      Tech B

    • C.

      Both Techs A and B

    • D.

      Neither Tech A nor B

    Correct Answer
    C. Both Techs A and B
    Explanation
    Both Techs A and B are correct. Disc brakes have been used on the front of most vehicles built since the early 1970s, and they are also commonly used on the rear wheels of many vehicles. A disc brake operates by squeezing brake pads on both sides of a rotor or disc that is attached to the wheel, providing effective braking power.

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  • 30. 

    Which of the following is MOST likely to be part of the hydraulic brake system?

    • A.

      Brake hoses

    • B.

      Wheel cylinder

    • C.

      Disc brake caliper

    • D.

      All of the above

    Correct Answer
    D. All of the above
    Explanation
    All of the mentioned components, brake hoses, wheel cylinder, and disc brake caliper, are commonly found in a hydraulic brake system. Brake hoses are responsible for carrying brake fluid to various brake components, including the wheel cylinders and disc brake calipers. The wheel cylinder is a hydraulic device that applies pressure to the brake shoes, causing them to press against the brake drum and slow down the vehicle. The disc brake caliper, on the other hand, applies pressure to the brake pads, causing them to clamp down on the brake rotor and slow down the vehicle. Therefore, all of these components are essential parts of a hydraulic brake system.

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Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Mar 21, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Apr 24, 2016
    Quiz Created by
    Atahcpss
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