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HYDRAULIC BRAKES > hydraulic brake quiz1 > Flashcards

hydraulic brake quiz1 Flashcards

1
Q

All the brakes drag on a truck equipped with hydraulic drum brakes.
The cause of this condition could be:

a seized metering valve.

insufficient brake pedal free travel.

a leaking primary cup seal in the master cylinder.

a pinched brake line to the rear brakes.

A

insufficient brake pedal free travel.

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2
Q

On a truck with hydraulic brakes a pulsating brake pedal could be caused by:

a rotor with excessive wear.

a drum worn bell mouthed.

a rotor with excessive parallelisim.

excessivly tight wheel bearings.

A

a rotor with excessive parallelisim.

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3
Q

When we say brake fluid is hygroscopic we mean that the brake fluid:

is water based.

must be mixed with water.

does not absorb water.

absorbs water.

A

absorbs water.

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4
Q

The first step to removing a brake caliper is to:

ensure the lid is secure on the master cylinder.

bleed the brakes.

remove the wheel bearings.

remove the rotor.

A

ensure the lid is secure on the master cylinder.

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5
Q

In the metric system, the joule is a measure of:

work

power

torque

force

A

work

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6
Q

The law of conservation of energy states:

energy disapates after being converted to heat.

energy can be transformed but not eliminated.

friction transforms energy to heat.

potential energy can be transformed to kinetic energy.

A

energy can be transformed but not eliminated.

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7
Q

Movement of heat through contact with another object is referred to as:

conduction

convection

radiation

expansion

A

conduction

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8
Q

The coefficient of friction may be defined as:

resistance to heat movement

how heavy the friction material is

the type of material being moved

resistance to movement between two objects

A

resistance to movement between two objects

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9
Q

Maximum braking occurs:

after the wheels are locked up

just before the shoes contact the drum

just before the wheels lock up with the brakes applied

after the wheels are locked up on dry pavement

A

just before the wheels lock up with the brakes applied

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10
Q

The brake fluid that will not mix with others is:

DOT 3

DOT 4

DOT 5

DOT 5.1

A

DOT 5

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11
Q

Self-energizing action may be described as:

When a brake shoe is drawn into the drum as it rotates

when a brake shoe forces the other away from the drum

when one shoe forces the other into the drum through a mecanical link

as the brake pad starts to engage with the rotor

A

When a brake shoe is drawn into the drum as it rotates

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12
Q

Internal brake parts should be lubricated with _______________ during assembly.

engine oil

soap and water

denatured alcohol

brake fluid

A

brake fluid

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13
Q

Before checking the lateral run-out on a rotor you should make sure that you:

tighten the wheel bearings

reduce toe-in to zero

remove the rotor

remove brake fluid from the master cylinder

A

tighten the wheel bearings

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14
Q

One precaution that should be observed before turning a drum on the lathe is to:

make sure the drum is not make of stainless steel.

make sure it is not past the minimum thickness.

make sure the damper band is installed.

allow .060 inch for machining.

A

make sure the damper band is installed.

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15
Q

A leaking secondary piston cup on the primary piston will allow:

brake fluid to leak from the drum brake circuit.

drum brakes to only partially apply.

brake fluid to leak into the fire wall.

no pressure from the drum brakes.

A

brake fluid to leak into the fire wall.

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16
Q

When the master cylinder is installed correctly, there should be a small clearance between the push rod and the primary piston. This clearance is to:

allow for heat expansion because of hard braking.

prevent brake drag.

reduce brake drag.

allow front brakes to apply first.

A

prevent brake drag.

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17
Q

The purpose of the compensating port in the master cylinder is to:

allow fluid to enter between the pistons in a dual master cylinder.

control release of hydraulic pressure when brakes release.

maintain a residual pressure in the brake system.

give more pressure for disc brakes.

A

control release of hydraulic pressure when brakes release.

18
Q

When there is servo action taking place during braking, this is referring to:

the ablilty of one shoe to force the other shoe into the brake drum.

the action where the shoe is drawn into the drum by its rotation.

either of the above.

bothe of the above.

A

Correct Answer
the ablilty of one shoe to force the other shoe into the brake drum.

19
Q

When prosportioning valves are used, their funciton is to:

provide a difference in pressure under all braking conditions.

provide a difference in pressure during light brake applications.

provide a difference in pressue under heavy braking conditions.

all of the above.

A

provide a difference in pressue under heavy braking conditions.

20
Q

If a 0.5 cm diameter master cylinder is replaced with a 2.5 cm diameter master cylinder, the result would be:

more pressure in the system.

more force at the callipers.

less pressure in the system.

more force at the wheel cylinders.

A

less pressure in the system.

21
Q

When a combination valve is used with front disc and rear drums the metering section is connected to the:

front brakes.

rear brakes.

between the front and rear brakes.

system before either front or rear circuits.

A

front brakes.

22
Q

If a wheel cylinder does not have cup expanders then a _____________ must be used to prevent fluid leakage.

metering valve.

proportioning valve.

residual valve.

pressure differential valve.

A

residual valve.

23
Q

Brake line must be flared using a(n):

ISO flare.

double flare.

single flare.

either a or b

A

double flare.
ISO flare.

24
Q

When a combination valve is used in a hydraulic brake system it usually contains:

a pressure differential valve.

a metering valve.

a proportioning valve.

all of the above.

A

all of the above.

25
Q

metering valves used in hydraulic brake systems are used to:

give different pressures in a brake system.

allow pressure to the rear brakes first.

are used in both the drum and disc circuits.

all of the above.

A

allow pressure to the rear brakes first.

26
Q

The purpose of the residual check valve in a master cylinder is to:

release hydraulic pressure

keep some pressure on the disc brakes.

help seal wheel cylinders.

maintain a dual braking circuit.

A

help seal wheel cylinders.

27
Q

The primary piston in a master cylinder is located:

at the front of the master cylinder.

in front of the compensating port.

piston closest to the firewall.

A

piston closest to the firewall.

28
Q

One advantage of disc brakes in the ability to:

have a large degree of self-energization.

require less effort to apply.

wear very little when compared to drum brakes.

resist brake fade.

A

resist brake fade.

29
Q

Which brake fluid should not be used with anti-lock brakes?

DOT 3

DOT 4

DOT 5

DOT 5.1

A

DOT 5

30
Q

What would be the force applied by a wheel cylinder if 1000 kPa were applied to a piston that is 5 cm2 ?

500N

0.5N

50N

5000N

A

500N

31
Q

Floating brake calipers are held in position by:

springs.

hydraulic pressure.

pins and guides.

bolt and key.

A

pins and guides.

32
Q

When brakes are released after a brake application, the caliper piston is returned into its released position by:

the piston seal.

return springs.

hydraulic pressure.

all of the above.

A

he piston seal.

33
Q

The principle of static friction is used in:

the service brake system with the vehicle in motion.

the park brake system.

ABS hydraulics.

the master cylinder system.

A

the park brake system.

34
Q

Pressure in an enclosed liquid:

depends on the size of the container.

varies with the shape of the container.

acts with equal force on equal areas.

acts parallel to the surface.

A

acts with equal force on equal areas.

35
Q

The force that tends to resist motion between objects in contact is called:

friction

pressure

clamp load

drag

A

friction

36
Q

Friction between two sliding surfaces depends on:

the amount of force pressing the two surfaces together.

the temperature of the surfaces in contact.

the coefficient of friction of the materials in contact.

all of the above are correct.

A

all of the above are correct

37
Q

The wheel cylinders and calipers convert pressure developed in the system into:

heat

mechanical force

directional pressure

static friction

A

mechanical force

38
Q

What two methods are used to mount brake linings to brake shoes and brake pads?

bolts and machine screws.

bonding and riveting.

brazing and welding.

high temperature and high pressure.

A

bonding and riveting.

39
Q

When inspecting brake rotors what do you measure for?

parallelism

lateral run out.

rotor thickness.

all the answers.

A

all the answers.

40
Q

Grease or oil on rubber brake components has no negative effects on the brake system.

true

false

A

false

41
Q

All brake master and wheel cylinders can be honed.

true

false

A

false

42
Q

The diaphragm seal in the filler cap allows atmospheric pressure to act on the brake fluid without letting moisture in.

true

false

A

true

HYDRAULIC BRAKES (2 decks)

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