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HET Year 1 > Hydraulic Brakes > Flashcards

Hydraulic Brakes Flashcards

1
Q

What law describes how energy is never consumed?

A

Law of conservation of Energy

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2
Q

What is miscibility?

A

The ability of brake fluid to be mixed with similar rated brake fluids

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3
Q

What is hygroscopic ?

A

The ability of brake fluid to absorb moisture.

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4
Q

Which brake fluid is silicone based?

A

DOT 5

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5
Q

Why is DOT 5 brake fluid not recommended for use in an ABS system?

A

DOT 5 brake fluid is not hygroscopic

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6
Q

Torque is

A

Rotational force

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7
Q

Power is

A

Rate of doing work

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8
Q

Energy is

A

Ability to do work

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9
Q

Work is

A

Force acting through a distance

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10
Q

Heat is

A

Amount of molecular energy

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11
Q

Steel springs are used to reduce abrasion on the brake line

A

Steel springs are used to reduce abrasion on the brake line

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12
Q

What is the purpose of the spring and expander in the wheel cylinder

A

The springs prevents air from entering the wheel cylinders when the braked are released

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13
Q

What best describes brake shoes used in a non servo design which self energize when the vehicle is moving forward?

A

Forward acting

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14
Q

What best describes the term centerfuse construction

A

The brake drum is a steel outter shell and a cast iron liner

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15
Q

The combination valve contains the metering valve and proportioning valve. T or F

A

True

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16
Q

Which port in the master cylinder allows fluid movement during a fast pedal return

A

The inlet port

17
Q

Why are disc brake pads and rotors repaired as units?

A

Disc brake pads and rotors are repaired in units because they wear against eachother

18
Q

What can cause the brake pedal to slowly move towards the floor when a steady brake application is made?

A

Master cylinder internal piston seal leak

19
Q

What is the best check for proper brake operation?

A

Road test

20
Q

Brake shoes should be replaced in sets across an axel

A

Brake shoes should be replaced in setsvacross an axel

21
Q

Backing plates do not transfer any type of braking forces. T or F

A

False

22
Q

What is meant by the “discard diameter”

A

Discard diameter is the maximum inside diameter a drum can have

23
Q

Taper is narrow top and wide bottom

A

Taper is narrow top and wide bottom

24
Q

Why must a brake drum never be machined past the maximum spec

A

The drum will no longer be able to absorb the heat

25
Q

Brake fluid must be replaced because it absorbs water

A

Brake fluid must be replaced because it absorbs water

26
Q

What provides the force in a power cluster system

A

The compressed air

27
Q

What supplies the signal pressure in the operation of a power cluster

A

Air valve

28
Q

What precaution must be observed prior to servicing an accumulator type hydraulic over hydraulic brake booster system

A

Pump the brake pedal with key off

29
Q

Where would a flow switch be located Ina hydraulic over hydraulic brake booster system

A

Between brake booster and the power steering reservoir

30
Q

What is the function of the EH pump

A

The EH pump supplies hydraulic fluid flow to the hydraulic brake booster

31
Q

Why does the brake pedal move slowly to the floor after the vehicle is started if the pedal has already been applied

A

The engine vacuum has been allowed to enter the vacuum chamber of the booster at the atmospheric air supplies boost

32
Q

Hydraulic parking brakes are spring applied and hydraulically released

A

Hydraulic parking brakes are spring applied and Hydraulically released

33
Q

Which step should be performed first when adjusting an external band type of parking brake

A

Side lining to drum clearance

34
Q

Which poly glycol based brake fluid has the highest boiling point

A

Dot 4

35
Q

Why should brake fluid be stored a sealed container

A

The fluid is Hygroscopic

HET Year 1 (11 decks)

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