Disc Brakes - Post
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 patternExplanation
Always use a star pattern to ensure the wheel is uniformly tightened to the hub.Rate this question:
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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 wrenchExplanation
The torque wrench ensures each lug is tightened exactly as much as each other lug.Rate this question:
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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 aboveExplanation
Each of these are examples of how a stud could be damaged.Rate this question:
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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 BExplanation
Disc rotors are available in both a hub and hubless-style configuration.Rate this question:
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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 BExplanation
The rotor would need to be replaced in both of these circumstances.Rate this question:
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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. FalseExplanation
Drums can not be refinished while they remain installed.Rate this question:
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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. TrueExplanation
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.Rate this question:
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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 BExplanation
Excessive thickness variation will cause surging and may lead to a shimmy in the steering wheel.Rate this question:
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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 BExplanation
Both of these are options for brake pad wear indication.Rate this question:
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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. TrueExplanation
A special tool is required when retracting a piston on a caliper with an integrated parking brake.Rate this question:
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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 BExplanation
Both of these will cause brake pedal pulsation, but when the ABS operates, it's considered normal.Rate this question:
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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. FalseExplanation
No, vise grips are way too aggressive to install on a brake hose.Rate this question:
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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. YellowExplanation
The ABS warning light is most often yellow. It is a less threatening situation for the vehicle occupants, than low brake fluid.Rate this question:
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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 BExplanation
Slotted and drilled will help with both heat removal and water removal, but it reduces the friction area of the pad with the rotor.Rate this question:
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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 aboveExplanation
The dust shield will help is keep all of these contaminates from the disc braking system.Rate this question:
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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 BExplanation
The push rod does not create hydraulic force. It is merely an intermediate component, responsible for transferring force to the remaining brake system.Rate this question:
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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.Rate this question:
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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 BExplanation
Fixed calipers are rigidly bolted in place. Sliding calipers do only have one piston.Rate this question:
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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.Rate this question:
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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 BExplanation
The seal for the piston is a stationary, square cut seal.Rate this question:
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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 BExplanation
Phenolic pistons will not corrode. Only the caliper cavity will.Rate this question:
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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 greaseExplanation
Axel grease is not used on braking components.Rate this question:
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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 BExplanation
Burnishing pads will help extend pad life and to reduce potential noise.Rate this question:
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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 BExplanation
If found to be damaged, wheel studs and lugs should never be reused or repaired.Rate this question:
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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 BExplanation
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.Rate this question:
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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 mechanismExplanation
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.Rate this question:
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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.Rate this question:
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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 aboveExplanation
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.Rate this question:
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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 BExplanation
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.Rate this question:
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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 aboveExplanation
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.Rate this question:
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