Question 1

Air brakes require at least _____ psi to operate correctly.
A)50
B)150
C)100
D)300

Accepted Answer

Air brakes require at least 150 psi to operate correctly.

Question 2

Which of the following statements about parking brake function is true?
A)The main purpose is to prevent the vehicle from moving after it is stopped.
B)The main purpose is to stop the vehicle while still in motion.
C)The main purpose is to assist in parallel parking the vehicle.
D)All of the above

Accepted Answer

The primary function of a parking brake is to prevent a vehicle from moving after it has been stopped. While it may also be used in emergency situations to stop a vehicle while in motion, this is not its primary purpose. Additionally, it is not necessary for parallel parking as the vehicle's regular brakes are sufficient for this maneuver.

Question 3

As drum brakes evolved, ____________shoe- and-drum brakes became the standard.
A)internal-expanding
B)external-contracting
C)external-band
D)internal-contracting

Accepted Answer

As drum brakes evolved, internal-expanding shoe-and-drum brakes became the standard. This is because they have a better braking performance and are less prone to brake fade. The shoes expand outwards against the drum when the brakes are applied, creating friction and slowing down the vehicle.

Question 4

Active braking systems can apply the brakes without the driver touching the brake pedal.  This is accomplished by using _____, yaw sensors and actuators.
A)wheel speed sensors
B)steering wheel sensors
C)tire inflation monitors
D)SIR rotation sensors

Accepted Answer

Active braking systems use wheel speed sensors, yaw sensors, and actuators to apply the brakes without the driver touching the brake pedal. Steering wheel sensors, tire inflation monitors, and SIR rotation sensors are not used for this purpose.

Question 5

A brake pedal assembly has a 9-inch lever and the master cylinder pushrod is 1.5 inches from the fulcrum. If the driver applies 50 pounds of force to the pedal, how much force will be applied to the master cylinder?
A)150 pounds
B)250 pounds
C)300 pounds
D)350 pounds

Accepted Answer

Using the formula for calculating force in a lever system: 
force applied to master cylinder = (length of master cylinder pushrod/length of pedal lever) x force applied to pedal
force applied to master cylinder = (1.5/9) x 50 
force applied to master cylinder = 8.33 x 50 
force applied to master cylinder = 416.67 lbs 
Therefore, the correct option is (C) 300 pounds, which is the closest option provided.

Question 6

Most brake pedal installations are an example of what is called a ____-class lever.
A)first
B)second
C)third
D)fourth

Accepted Answer

A second-class lever has the resistance between the effort and the fulcrum. In the case of a brake pedal, the pad, or brake shoe, is the resistance, the action of the foot pressing down on the pedal is the effort, and the pivot point on which the pedal rotates is the fulcrum.

Question 7

Electronic braking covers which of the following systems?
A)ABS
B)TCS
C)Both A and B
D)Neither A nor B

Accepted Answer

Electronic braking covers both ABS (anti-lock braking system) and TCS (traction control system).

Question 8

Technician A says lockup is a condition in which a wheel stops rotating and skids on the road surface. Technician B says that positive wheel spin happens with no traction and the wheel spins but does not move the vehicle. Who is correct?
A)A only
B)B only
C)Both A and B
D)Neither A nor B

Accepted Answer

Both statements by Technician A and Technician B are correct. Lockup refers to the condition where a wheel stops rotating and skids, typically due to excessive braking force. Positive wheel spin, as described by Technician B, occurs when a wheel spins without providing traction to move the vehicle, often due to loss of grip or excessive power application.

Question 9

The major hydraulic components of a typical light vehicle brake system include all of the following EXCEPT :
A)master cylinder
B)wheel cylinders
C)calipers
D)rotors

Accepted Answer

Rotors are not a hydraulic component in a light vehicle brake system. They are a mechanical component that the hydraulic system applies pressure to, in order to create friction and slow down or stop the vehicle. The other three options listed (master cylinder, wheel cylinders, and calipers) are all hydraulic components that play a role in the operation of the brake system.

Question 10

Trailer brakes are being discussed. Technician A says that hydraulic surge brakes are typically used on RV units. Technician B says that electric trailer brakes are typically used on utility and RV units. Who is correct?
A)A only
B)B only
C)Both A and B
D)Neither A nor B

Accepted Answer

The answer of Trailer brakes are being discussed. Technician A...

Question 11

Technician A says that modern-day vehicles have split brake systems. Technician B says that all modern-day vehicles use a diagonal split system. Who is correct?
A)A only
B)B only
C)Both A and B
D)Neither A nor B

Accepted Answer

Technician A is correct, as many modern-day vehicles have split brake systems, which means that the front and rear brakes are separately controlled. Technician B is incorrect, as not all modern-day vehicles use a diagonal split system. Some vehicles use a front-to-rear split system, while others use a side-to-side split system.

Question 12

Air brake systems use _____to control the movement of a diaphragm.
A)hydraulic pressure
B)engine vacuum
C)component rotation
D)compressed air

Accepted Answer

Air brake systems use compressed air to control the movement of a diaphragm. When the brake pedal is pressed, air is released into the brake chamber, causing the diaphragm to move and apply the brakes. When the pedal is released, the air is vented out, releasing the brakes.

Question 13

The typical mechanical components of a hydraulic brake system include all of the following   EXCEPT:
A)brake pedal
B)master cylinder
C)brake pads
D)brake drums

Accepted Answer

The answer of The typical mechanical components of a hydraulic...

Question 14

A ________ is used to tell the brake actuator how fast and how far the driver applied the brake pedal.
A)master cylinder
B)fulcrum
C)lever
D)stroke sensor

Accepted Answer

The stroke sensor is used to measure the distance and speed at which the driver applied the brake pedal, allowing the brake actuator to adjust accordingly. The master cylinder, fulcrum, and lever are all components of the braking system but are not directly involved in determining how the driver applied the brake pedal.

Question 15

_____ braking systems apply the trailer brakes in case the trailer disconnects from the tow vehicle.
A)Trailer Breakaway
B)Two wheel
C)Four wheel
D)Trailer Anti-lock

Accepted Answer

Trailer Breakaway braking systems activate the trailer brakes if the trailer becomes disconnected from the tow vehicle. This is an important safety feature that can prevent accidents in case of a trailer separation. Two wheel and Four wheel braking systems are not designed for this specific function, and Trailer Anti-lock braking systems can prevent skidding but do not activate the brakes in case of a trailer separation.

Question 16

Boat trailers do not use electric braking because water _____ the life expectation of electric brake components.
A)lengthens
B)shortens
C)does not affect
D)None of the above

Accepted Answer

Water can cause corrosion to the electric brake components, leading to faster wear and tear, which shortens the life expectancy of the brakes. Therefore, boat trailers typically use surge brakes, which rely on hydraulic pressure, rather than electric brakes.

Question 17

Technician A says disc brakes are more effective than drum brakes. Technician B says disc brakes require more application pressure than drum brakes. Who is correct?
A)A only
B)B only
C)Both A and B
D)Neither A nor B

Accepted Answer

The answer of Technician A says disc brakes are more...

Question 18

Which of the following materials is used for brake lines?
A)Steel
B)Rubber
C)Both A and B
D)Neither A nor B

Accepted Answer

Brake lines are made of steel as it has high strength and durability to withstand the pressure and heat generated during braking. Rubber is not used for brake lines as it is prone to degradation and does not have the necessary strength to withstand the pressure.

Question 19

Trailer brakes may be of one of two types, _____ or _____.
A)hydraulic surge, mechanical
B)mechanical, electric
C)electric, rods and pulleys
D)hydraulic surge, electric

Accepted Answer

Trailer brakes can be of two types: hydraulic surge or electric. Hydraulic surge brakes are activated by the momentum of the trailer pushing forward against the tow vehicle when it slows down, while electric brakes are activated by an electrical signal from the tow vehicle.

Question 20

Trailer brakes do not apply when the vehicle is moving in a _____ direction.
A)circular
B)reverse
C)straight line
D)swaying

Accepted Answer

Trailer brakes are designed to apply when the towing vehicle brakes are applied. When the vehicle is moving in reverse, the trailer brakes may not engage as intended, leading to reduced braking efficiency and potential safety issues.

Quiz 1: Brake System Fundamentals

Air brakes require at least _____ psi to operate correctly.

Which of the following statements about parking brake function is true?

As drum brakes evolved, ____________shoe- and-drum brakes became the standard.

Active braking systems can apply the brakes without the driver touching the brake pedal. This is accomplished by using _____, yaw sensors and actuators.

A brake pedal assembly has a 9-inch lever and the master cylinder pushrod is 1.5 inches from the fulcrum. If the driver applies 50 pounds of force to the pedal, how much force will be applied to the master cylinder?

Most brake pedal installations are an example of what is called a ____-class lever.

Electronic braking covers which of the following systems?

Technician A says lockup is a condition in which a wheel stops rotating and skids on the road surface. Technician B says that positive wheel spin happens with no traction and the wheel spins but does not move the vehicle. Who is correct?

The major hydraulic components of a typical light vehicle brake system include all of the following EXCEPT :

Trailer brakes are being discussed. Technician A says that hydraulic surge brakes are typically used on RV units. Technician B says that electric trailer brakes are typically used on utility and RV units. Who is correct?

Technician A says that modern-day vehicles have split brake systems. Technician B says that all modern-day vehicles use a diagonal split system. Who is correct?

Air brake systems use _____to control the movement of a diaphragm.

The typical mechanical components of a hydraulic brake system include all of the following EXCEPT:

A ________ is used to tell the brake actuator how fast and how far the driver applied the brake pedal.

_____ braking systems apply the trailer brakes in case the trailer disconnects from the tow vehicle.

Boat trailers do not use electric braking because water _____ the life expectation of electric brake components.

Technician A says disc brakes are more effective than drum brakes. Technician B says disc brakes require more application pressure than drum brakes. Who is correct?

Which of the following materials is used for brake lines?

Trailer brakes may be of one of two types, _ or _.

Trailer brakes do not apply when the vehicle is moving in a _____ direction.