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Brake Design > Chapter 6 > Flashcards

Chapter 6 Flashcards

1
Q

Explain the 3 general kinds of power boosters used to increase breaking force.

A

one uses intake manifold vacuum one a diaphram, second uses hydraulic pressure form a hydraulic pump, power breake booster system that controls brake hydraulics

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2
Q

brake pedal feel is provided in vacuum boosters by a reaction disc or a reaction plate and levers. Explain how this works.

A
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3
Q

What is the purpose of the power piston in a vacuum power unit?

A

contains and operates the vacuum and air valves that control the diaphragm, also tansmits force form the diaphragm through a piston rod to the master cylinder

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4
Q

Explain how the braking system can still apply the brakes if the booster fails completely.

A

add on devices that do not alter the system. they allow braking even if the power supply fails

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5
Q

Why are hydraulic power assist units used on vehicles with diesel engines?

A

no vacuum, use huydraulic power for brake booster

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6
Q

Briefly explain how the hydro-boost power brake booster operates.

A

power steering pump delivers pressure to the booster assembly. Hydraulic booster helps driver apply for to the master cylinder pushrod. te sppol valve directs pressure to a power chamber. the boost piston in the power chamber reacts to this presssure and moves forward

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7
Q

List the four methods that can be used to reduce pedal pressure requirements or to boost the force applied to the master cylinder

A

increasing pedal force, mechanical advantage (leverage at brake pedal) hyrdaulic advantages, power boosters

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8
Q

xplain the general operation of the BA system used on a vacuum booster.

A

detects brake pedal application speed. When driver hits brake as fast as possible the BA will quickly activate the brake booster

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9
Q

Explain the purpose of the stroke sensor on an EHB system.

A

when pedal is depressed on EHB, pedal movement and speed are detected by stroke sensor and signal is sent to the EHB control module

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10
Q

Explain the purpose of an accumulator in a hydraulic brake power assist system.

A

allows for a few booster assited stop if the if the pump should fail.

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11
Q

During normal operation of the EHB, the master cylinder supplies pressurized fluid to the _______________.

A

Modulator

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12
Q

To understand vacuum booster systems, the rela- tionship of atmospheric _______________ and _______________ must also be understood.

A

Pressure, Vacuum

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13
Q

Atmospheric pressure varies with _____________ and _______________, but at sea level and at 688F, it is 14.7 psi.

A

Altitude, temperature

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14
Q

Without pedal feel, the booster would apply the power assist in _______________ steps and cause very poor braking control.

A

sudden

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15
Q

_______________ _______________ is provided in vacuum boosters by a reaction disc (or reaction plate and levers ).

A

pedal feel

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16
Q

The amount of braking power from a vacuum booster is directly related to the _______________ of the diaphragm.

A

area

17
Q

Because the pedal pushrod is mechanically con- nected through the _______________, any vacuum failure will not cause loss of braking action.

A

booster

18
Q

The hydro-boost system booster has a large _______________ valve that controls fluid flow through the unit.

A

spool

19
Q

Vacuum is air pressure less than _______________ pressure.

A

atmospheric

20
Q

An _______________ is a pressurized storage reservoir.

A

accumulator

21
Q

Technician A says the pedal ratio multiplies force applied to the master cylinder. Technician B says hydraulic piston size can be used to multiply hydraulic pressure applied by the master cylinder to the wheel cylinders and caliper pistons. Who is correct?

A

both

22
Q

Technician A says the amount of braking power from a vacuum booster is directly related to the area of the diaphragm. Technician B says a booster with a small diaphragm would provide more power assist. Who is correct?

A

a only

23
Q

Technician A says that when the brakes are released, vacuum is on both sides of the booster diaphragm. Technician B says that when the brakes are released, atmospheric pressure may be on one side of the booster diaphragm. Who is correct?

A

a only

24
Q

Technician A says the power piston contains and operates the vacuum and air (atmospheric) valves that control the diaphragm. Technician B says the power piston also transmits the force from the diaphragm through a piston rod to the master cylinder. Who is correct?

A

both

25
Q

Technician A says that the EHB system is a direct power booster. Technician B says the EHB and the BA units share information with the ABS, TCS, and electronic suspension. Who is correct?

A

b only

26
Q

Tandem brake boosters are being discussed: Technician A says tandem diaphragm boosters use one large diaphragm. Technician B says that a tandem diaphragm can provide more brake boosting power in a smaller housing. Who is correct?

A

b only

27
Q

Technician A says that a hydro-boost system uses brake fluid for the booster. Technician B says the hydro-boost system uses power steering fluid for the brakes. Who is correct?

A

neither

28
Q

Power brake boosters are being discussed. Technician A says power brake boosters do not alter the basic brake system. Technician B says all boosters have a power reserve to provide at least one power- assisted stop if power is lost. Who is correct?

A

both

29
Q

The BA system is being discussed. Technician A says that the BA system can build pressure in the brake system rapidly in case of a panic stop. Technician B says that the BA system can make a difference between vehicle control and a possible accident. Who is correct?

A

both

30
Q

Technician A says if the EHB should fail com- pletely, the vehicle will have to be towed to the nearest shop. Technician B says the driver can stop the vehicle but may have to press on the pedal harder than normal. Who is correct?

A

b only

Brake Design (4 decks)

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