Brakes

Question 1

List 3 qualities that brake fluid must have

Answer 1

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

Question 2

What does brake fluid do?

Answer 2

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

Question 3

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

Answer 3

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

Question 4

What does hygroscopic mean?

Answer 4

Attracts water

Question 5

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

Answer 5

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

Question 6

What is the DOT

Answer 6

The department of transport

Question 7

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

Answer 7

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

Question 8

What is kinetic energy converted to during braking?

Answer 8

Heat

Question 9

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

Answer 9

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

Question 10

List 3 components that make up a brake pad

Answer 10

Metal backing plate
Brake lining
Damping material

Question 11

What is damping material used for on a brake pad?

Answer 11

To reduce vibration and noise

Question 12

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

Answer 12

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

Question 13

What is a low coefficient of friction?

Question 14

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

Answer 14

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

Question 15

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

Answer 15

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

Question 16

Give another name for brake glazing?

Answer 16

Brake fading

Question 17

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

Answer 17

To drain heat and water

Question 18

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

Answer 18

Parking brake
Service brake

Question 19

What does the master cylinder do?

Answer 19

Increase the pressure in the foundation system

Question 20

What does the brake servo do?

Answer 20

Enhances braking power

Question 21

What do the brake disc and brake drum do?

Answer 21

Slow the wheel

Question 22

How is the hand brake operated?

Answer 22

Mechanically

Question 23

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

Answer 23

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

Question 24

What is the function of brake lines?

Answer 24

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

Question 25

What is the function of brake pipes?

Answer 25

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

Question 26

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

Answer 26

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

Question 27

How can you tell if the brake hose is twisted?

Answer 27

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

Question 28

List 5 of the most common brake hose problems

Answer 28

Twisted Worn Fine cracks Leakage at the coupling Bulges

Question 29

List 2 functions of the brake master cylinder

Answer 29

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

Question 30

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

Answer 30

They open a hole

Question 31

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

Answer 31

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

Question 32

List 2 components of an electric parking brake system

Answer 32

Button Electric motor and control unit

Question 33

Where is the brake pressure limiter always located?

Answer 33

In the rear wheel brake circuit

Question 34

Name the 2 types of brake pressure regulators

Answer 34

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