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Automotive Level 2 > Brakes > Flashcards

Brakes Flashcards

1
Q

List 3 qualities that brake fluid must have

A

A high boiling point
A constant fluidity at different temperatures
Doesn’t affect the rubber or metal components of the brake system

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2
Q

What does brake fluid do?

A

Transfers the force of the pedal to the wheel brake cylinders and/or calipers

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3
Q

What happens in brake fluid boils?
What is this called?

A

There are small bubbles in in fluid which can be compressed, so the brakes are less effective
Vapour lock

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4
Q

What does hygroscopic mean?

A

Attracts water

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5
Q

Why must brake fluid be hygroscopic?
What is the disadvantage of this?

A

To bind the free water particles to brake fluid
The brake fluid’s boiling point is reduced

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6
Q

What is the DOT

A

The department of transport

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7
Q

What is dry boiling point?
What is wet boiling point?
Which one is lower?

A

The boiling point of break fluid without water bonded to it
The boiling point of break fluid with 3% water
Wet boiling point

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8
Q

What is kinetic energy converted to during braking?

A

Heat

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9
Q

What does the piston seal do?
What could its function be compared to?

A

It is in between the brake caliper and piston and deforms during braking, then returns to its original shape after
A spring, which pushes the brake piston back to its original position

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10
Q

List 3 components that make up a brake pad

A

Metal backing plate
Brake lining
Damping material

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11
Q

What is damping material used for on a brake pad?

A

To reduce vibration and noise

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12
Q

What 2 things have occurred when there is glazing on the brake lining?

A

The brake lining has overheated
The bonding material has formed a glass-like layer on the surface of the brake lining

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13
Q

What is a low coefficient of friction?

A
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14
Q

How do you find out that brake pads are extremely worn without checking them visibly?
(2 ways)

A

The acoustic indicator, which makes a scraping noise when rubbed against by the brake disc
The electric wear indicator will send a signal to the dashboard light

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15
Q

How do you find out that brake pads are extremely worn by checking them visibly?
(2 ways)

A

The groove in the centre will not be visible
By measuring them

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16
Q

Give another name for brake glazing?

A

Brake fading

17
Q

Other than to check if brake pads are worn, what is the other function of the groove in the centre?

A

To drain heat and water

18
Q

Give another name for hand brake
Give another name for foot brake

A

Parking brake
Service brake

19
Q

What does the master cylinder do?

A

Increase the pressure in the foundation system

20
Q

What does the brake servo do?

A

Enhances braking power

21
Q

What do the brake disc and brake drum do?

A

Slow the wheel

22
Q

How is the hand brake operated?

A

Mechanically

23
Q

What is the difference between a fixed caliper and floating caliper?

A

Fixed has 2 pistons and 2 brake pads.
Floating has 1 piston and 2 brake pads

24
Q

What is the function of brake lines?

A

To ensure a rigid connection between the master cylinder and brake piston or caliper

25
Q

What is the function of brake pipes?

A

To ensure a flexible connection between the brake lines and brake piston or caliper

26
Q

What 2 things must be ensured when checking the brake system for leaks?

A

That the engine is idling
That the brake pedal is pressed down

27
Q

How can you tell if the brake hose is twisted?

A

There’s sometimes a white line that runs along the brake hose

28
Q

List 5 of the most common brake hose problems

A

Twisted
Worn
Fine cracks
Leakage at the coupling
Bulges

29
Q

List 2 functions of the brake master cylinder

A

To convert pedal force into hydraulic pressure
To move brake fluid to the wheel brake cylinders

30
Q

What happen to the brake cup seals when the brake pedal is released?

A

They open a hole

31
Q

Why do brake cup seals open a hole when you release the brake pedal?

A

To prevent a vacuum from forming, which would increase the chance of air getting into the system

32
Q

List 2 components of an electric parking brake system

A

Button
Electric motor and control unit

33
Q

Where is the brake pressure limiter always located?

A

In the rear wheel brake circuit

34
Q

Name the 2 types of brake pressure regulators

A

Brake pressure regulator with a fixed switching point
Load-dependent brake pressure regulator

35
Q
A

Automotive Level 2 (20 decks)

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