Question 1

The Hydro-Boost brake booster uses what type of fluid to multiply brake pedal force?

Accepted Answer

A)  Power steering fluid
B)  Transmission fluid
C)  Brake fluid
D)  None of theseE) All of the above
F) A) and D)

Question 2

To provide the driver with a sense of "feel" during braking, vacuum boosters use a ________.

Accepted Answer

A)  Diaphragm spacer
B)  Vacuum diverter
C)  Pressure restrictor
D)  Reaction discE) All of the above
F) C) and D)

Question 3

The first step in diagnosing a Hydro-Boost problem is ________.

Accepted Answer

A)  A pressure test of the pump
B)  A volume test of the pump
C)  A thorough visual inspection
D)  To tighten the power steering drive beltE) A) and C)
F) All of the above

Question 4

A hydraulically operated booster unit stores fluid under pressure by means of ________.

Accepted Answer

A)  An actuator
B)  A pressure chamber
C)  An accumulator
D)  A boost pistonE) A) and D)
F) None of the above

Question 5

The brake assist system (BAS)  is activated ________.

Accepted Answer

A)  On the rear brakes
B)  Only in the rain
C)  Whenever the brakes are applied
D)  During a panic stopE) All of the above
F) A) and B)

Question 6

Two technicians are discussing vacuum brake boosters. Technician A says that when the engine is running and the driver's foot is off the brake pedal, a vacuum is present on both sides of the booster diaphragm. Technician B says that when the brakes are in the applied position, vacuum is present on the front side of the diaphragm. Which technician is correct?

Accepted Answer

A)  Technician A only
B)  Technician B only
C)  Both technicians A and B
D)  Neither technician A nor BE) B) and C)
F) A) and D)

Question 7

A common source of vacuum for boosters used on diesel engines is ________.

Accepted Answer

A)  Exhaust manifold
B)  Auxiliary vacuum pump
C)  Carburetor
D)  Intake manifoldE) B) and C)
F) A) and B) B

Question 8

If the engine stops running, the Hydro-Boost will not be able to provide any power assist for the brakes.

Accepted Answer

A) True 
 B)False

Question 9

The purpose of the charcoal filter in the vacuum hose between the engine and the vacuum brake booster is to ________.

Accepted Answer

A)  Filter the air entering the engine
B)  Trap gasoline vapors to keep them from entering the booster
C)  Direct the vacuum
D)  Act as a one-way check valve to help keep a vacuum reserve in the boosterE) B) and C)
F) A) and D)

Question 10

A Hydro-Boost unit uses the power steering pump as a source of power.

Accepted Answer

A) True 
 B)False

Question 11

Technician A says the vacuum supply test involves inspecting the vacuum supply hose for kinks. Technician B says the test involves checking the level of vacuum supplied by the engine or vacuum pump. Which technician is correct?

Accepted Answer

A)  Technician A only
B)  Technician B only
C)  Both technicians A and B
D)  Neither technician A nor BE) C) and D)
F) A) and C)

Question 12

What component is the technician holding in this photograph?

Accepted Answer

A)  Fluid plug
B)  Check valve
C)  Vacuum sensor
D)  Vacuum elbowE) All of the above
F) C) and D) B

Question 13

An accumulator such as that used on hydraulic brake boosters ________.

Accepted Answer

A)  Provides a reserve in the event of a failure
B)  Works against engine vacuum
C)  Provides higher force being fed back to the driver's foot
D)  Reduces brake pedal noiseE) None of the above
F) A) and D)

Question 14

Two technicians are discussing vacuum brake boosters. Technician A says that a low, soft brake pedal is an indication of a defective booster. Technician B says that there should be at least two power-assisted brake applications after the engine stops running. Which technician is correct?

Accepted Answer

A)  Technician A only
B)  Technician B only
C)  Both technicians A and B
D)  Neither technician A nor BE) A) and B)
F) None of the above

Question 15

A brake pedal feels spongy when depressed. Technician A says that a defective hydraulic brake booster could be the cause. Technician B says that a defective vacuum brake booster could be the cause. Which technician is correct?

Accepted Answer

A)  Technician A only
B)  Technician B only
C)  Both technicians A and B
D)  Neither technician A nor BE) A) and D)
F) B) and D)

Question 16

Technician A says when the brakes are applied in a vacuum booster, the vacuum control valve is sealed.Technician B says the vacuum control valve is opened. Which technician is correct?

Accepted Answer

A)  Technician A only
B)  Technician B only
C)  Both technicians A and B
D)  Neither technician A nor BE) B) and C)
F) None of the above

Question 17

The pushrod length should be checked whenever a new master cylinder is installed.

Accepted Answer

A) True 
 B)False

Question 18

Technician A says that to check the operation of a vacuum brake booster, the brake pedal should be depressed until the assist is depleted and then start the engine. Technician B says that the brake pedal should drop when the engine starts, if the booster is okay. Which technician is correct?

Accepted Answer

A)  Technician A only
B)  Technician B only
C)  Both technicians A and B
D)  Neither technician A nor BE) A) and D)
F) B) and C) C

Question 19

The booster operation test determines if the booster is ________.

Accepted Answer

A)  Receiving adequate vacuum
B)  Creating brake application force
C)  Both A and B
D)  Neither A nor BE) C) and D)
F) B) and D)

Question 20

Brake pedal feedback to the driver is provided by the ________.

Accepted Answer

A)  Reaction system
B)  Charcoal filter unit
C)  Vacuum diaphragm
D)  Vacuum check-valve operationE) B) and C)
F) A) and D)

Exam 105: Power Brake Unit Operation, Diagnosis, and Service

The Hydro-Boost brake booster uses what type of fluid to multiply brake pedal force?

Correct Answer
verified

To provide the driver with a sense of "feel" during braking, vacuum boosters use a ________.

Correct Answer
verified

The first step in diagnosing a Hydro-Boost problem is ________.

Correct Answer
verified

A hydraulically operated booster unit stores fluid under pressure by means of ________.

Correct Answer
verified

The brake assist system (BAS) is activated ________.

Correct Answer
verified

Correct Answer
verified

A common source of vacuum for boosters used on diesel engines is ________.

Correct Answer
verified
B

If the engine stops running, the Hydro-Boost will not be able to provide any power assist for the brakes.

Correct Answer
verified

The purpose of the charcoal filter in the vacuum hose between the engine and the vacuum brake booster is to ________.

Correct Answer
verified

A Hydro-Boost unit uses the power steering pump as a source of power.

Correct Answer
verified

Technician A says the vacuum supply test involves inspecting the vacuum supply hose for kinks. Technician B says the test involves checking the level of vacuum supplied by the engine or vacuum pump. Which technician is correct?

Correct Answer
verified

What component is the technician holding in this photograph?

Correct Answer
verified
B

An accumulator such as that used on hydraulic brake boosters ________.

Correct Answer
verified

Two technicians are discussing vacuum brake boosters. Technician A says that a low, soft brake pedal is an indication of a defective booster. Technician B says that there should be at least two power-assisted brake applications after the engine stops running. Which technician is correct?

Correct Answer
verified

A brake pedal feels spongy when depressed. Technician A says that a defective hydraulic brake booster could be the cause. Technician B says that a defective vacuum brake booster could be the cause. Which technician is correct?

Correct Answer
verified

Technician A says when the brakes are applied in a vacuum booster, the vacuum control valve is sealed.Technician B says the vacuum control valve is opened. Which technician is correct?

Correct Answer
verified

The pushrod length should be checked whenever a new master cylinder is installed.

Correct Answer
verified

Technician A says that to check the operation of a vacuum brake booster, the brake pedal should be depressed until the assist is depleted and then start the engine. Technician B says that the brake pedal should drop when the engine starts, if the booster is okay. Which technician is correct?

Correct Answer
verified
C

The booster operation test determines if the booster is ________.

Correct Answer
verified

Brake pedal feedback to the driver is provided by the ________.

Correct Answer
verified

Exam 105: Power Brake Unit Operation, Diagnosis, and Service

The Hydro-Boost brake booster uses what type of fluid to multiply brake pedal force?

Correct AnswerverifiedShow Answer

To provide the driver with a sense of "feel" during braking, vacuum boosters use a ________.

Correct AnswerverifiedShow Answer

The first step in diagnosing a Hydro-Boost problem is ________.

Correct AnswerverifiedShow Answer

A hydraulically operated booster unit stores fluid under pressure by means of ________.

Correct AnswerverifiedShow Answer

The brake assist system (BAS) is activated ________.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

A common source of vacuum for boosters used on diesel engines is ________.

Correct AnswerverifiedB

If the engine stops running, the Hydro-Boost will not be able to provide any power assist for the brakes.

Correct AnswerverifiedShow Answer

The purpose of the charcoal filter in the vacuum hose between the engine and the vacuum brake booster is to ________.

Correct AnswerverifiedShow Answer

A Hydro-Boost unit uses the power steering pump as a source of power.

Correct AnswerverifiedShow Answer

Technician A says the vacuum supply test involves inspecting the vacuum supply hose for kinks. Technician B says the test involves checking the level of vacuum supplied by the engine or vacuum pump. Which technician is correct?

Correct AnswerverifiedShow Answer

What component is the technician holding in this photograph?

Correct AnswerverifiedB

An accumulator such as that used on hydraulic brake boosters ________.

Correct AnswerverifiedShow Answer

Two technicians are discussing vacuum brake boosters. Technician A says that a low, soft brake pedal is an indication of a defective booster. Technician B says that there should be at least two power-assisted brake applications after the engine stops running. Which technician is correct?

Correct AnswerverifiedShow Answer

A brake pedal feels spongy when depressed. Technician A says that a defective hydraulic brake booster could be the cause. Technician B says that a defective vacuum brake booster could be the cause. Which technician is correct?

Correct AnswerverifiedShow Answer

Technician A says when the brakes are applied in a vacuum booster, the vacuum control valve is sealed.Technician B says the vacuum control valve is opened. Which technician is correct?

Correct AnswerverifiedShow Answer

The pushrod length should be checked whenever a new master cylinder is installed.

Correct AnswerverifiedShow Answer

Technician A says that to check the operation of a vacuum brake booster, the brake pedal should be depressed until the assist is depleted and then start the engine. Technician B says that the brake pedal should drop when the engine starts, if the booster is okay. Which technician is correct?

Correct AnswerverifiedC

The booster operation test determines if the booster is ________.

Correct AnswerverifiedShow Answer

Brake pedal feedback to the driver is provided by the ________.

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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B

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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B

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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C

Correct Answer
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Correct Answer
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