Hydraulic Brakes

Question 1

What law describes how energy is never consumed?

Answer 1

Law of conservation of Energy

Question 2

What is miscibility?

Answer 2

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

Question 3

What is hygroscopic ?

Answer 3

The ability of brake fluid to absorb moisture.

Question 4

Which brake fluid is silicone based?

Answer 4

DOT 5

Question 5

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

Answer 5

DOT 5 brake fluid is not hygroscopic

Question 6

Torque is

Answer 6

Rotational force

Question 7

Power is

Answer 7

Rate of doing work

Question 8

Energy is

Answer 8

Ability to do work

Question 9

Work is

Answer 9

Force acting through a distance

Question 10

Heat is

Answer 10

Amount of molecular energy

Question 11

Steel springs are used to reduce abrasion on the brake line

Answer 11

Steel springs are used to reduce abrasion on the brake line

Question 12

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

Answer 12

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

Question 13

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

Answer 13

Forward acting

Question 14

What best describes the term centerfuse construction

Answer 14

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

Question 15

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

Answer 15

True

Question 16

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

Answer 16

The inlet port

Question 17

Why are disc brake pads and rotors repaired as units?

Answer 17

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

Question 18

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

Answer 18

Master cylinder internal piston seal leak

Question 19

What is the best check for proper brake operation?

Answer 19

Road test

Question 20

Brake shoes should be replaced in sets across an axel

Answer 20

Brake shoes should be replaced in setsvacross an axel

Question 21

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

Answer 21

False

Question 22

What is meant by the “discard diameter”

Answer 22

Discard diameter is the maximum inside diameter a drum can have

Question 23

Taper is narrow top and wide bottom

Answer 23

Taper is narrow top and wide bottom

Question 24

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

Answer 24

The drum will no longer be able to absorb the heat

Question 25

Brake fluid must be replaced because it absorbs water

Answer 25

Brake fluid must be replaced because it absorbs water

Question 26

What provides the force in a power cluster system

Answer 26

The compressed air

Question 27

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

Answer 27

Air valve

Question 28

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

Answer 28

Pump the brake pedal with key off

Question 29

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

Answer 29

Between brake booster and the power steering reservoir

Question 30

What is the function of the EH pump

Answer 30

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

Question 31

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

Answer 31

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

Question 32

Hydraulic parking brakes are spring applied and hydraulically released

Answer 32

Hydraulic parking brakes are spring applied and Hydraulically released

Question 33

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

Answer 33

Side lining to drum clearance

Question 34

Which poly glycol based brake fluid has the highest boiling point

Answer 34

Dot 4

Question 35

Why should brake fluid be stored a sealed container

Answer 35

The fluid is Hygroscopic