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Motive Action > Brake Systems > Flashcards

Brake Systems Flashcards

1
Q

What are the major parts of a typical automotive braking system?

A
  • brake pedal
  • brake booster
  • master cylinder
  • brake lines
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2
Q

What is the purpose of any automotive braking system?

A

To allow control, to stop, and to hold vehicle.

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3
Q

Describe the brake fluid viscosity.

A

At temperatures of -40 and below the brake fluid must still flow freely

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4
Q

Describe the brake fluid boiling point.

A

The brake fluid must be able to handle extreme heat (temps up to 200C) without boiling.

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5
Q

What happens if brake fluid boils?

A

The fluid will compress and brakes will become spongy and inefficient.

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6
Q

Describe non-corrosive in brake fluid, in the brake system.

A

The fluid must not corrode with any metals, slight corrosion can cause the tiny parts of a braking system to move freely.

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7
Q

what metals can the brake system include?

A

Aluminum, brass, steel, and cast iron

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8
Q

Describe the hydroscopicity in brake fluid.

A

The ability to absorb moisture in the braking system so it does not corrode metal parts of the braking system.

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9
Q

What happens to the boiling point of brake fluid when it absorbs more moisture?

A

Boiling point goes down

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10
Q

Describe the lubrication in brake fluid.

A

Brake fluid must provide all the lubrication the system requires.

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11
Q

Why can’t you use a mineral based lubricants in a braking system?

A

Mineral based lubricants would cause the rubber seals to sweep excessively.

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12
Q

Describe the stability in brake fluid.

A

The brake fluid must be able to come into contact with various metals, handle extreme pressure and heat, and not break down.

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13
Q

Describe the miscibility of brake fluid.

A

Brake fluids of the same rating must be able to mix with brake fluid from other manufacturers without reaction.

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14
Q

Describe the rubber compatibility in brake fluid.

A

Brake fluid is designed to not react with the rubber inside a brake system.

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15
Q

What are the cautions with brake fluid?

A

Brake fluid can damage rubber and paint outside the braking system.

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16
Q

What’s are the 3 types of brake fluid?

A

Dot3, dot4, and dot 5

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17
Q

What brake fluid(s) are glycol based fluid?

A

Dot 3 and dot 4

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18
Q

What brake fluid(s) are silicone based fluid?

A

Dot 5

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19
Q

Dot ___ and Dot___ are compatible. Dot _____ is never compatible.

A

Dot3 and dot 4, dot 5

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20
Q

What is the colour of dot 3, dot 4, and dot 5 brake fluid?

A

Dot 3 and dot 4 are amber coloured, dot 5 is purple

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21
Q

What is the dry boiling point for dot 3?

A

205 degree C

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22
Q

What is the dry boiling point for dot 4?

A

230 degree C

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23
Q

What is the dry boiling point for dot 5?

A

260 degree C

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24
Q

What is the boiling point with 3% water for dot 3?

A

140 degree C

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25
Q

What is the boiling point with 3% water for dot 4?

A

155 degree C

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26
Q

What is the boiling point with 3% water for dot 5?

A

180 degree C

27
Q

Which fluid does not absorb water, and shouldn’t be used in braking systems with ABS?

A

Dot 5

28
Q

What is the brake master cylinder?

A

Is basically a foot operated pump

29
Q

What are the main functions of a master cylinder?

A
  • To develop and equalize pressure for the brake system
  • Maintain appropriate fluid level
  • keeps out contaminants(by keeping a slight positive pressure on the system)
30
Q

What is a tandem master cylinder?

A

It splits the brake system into 2 separate circuits with equal pressure.

31
Q

The brake system can be split in 2 ways, what are they?

A

Diagonally split system, or longitudinally.

32
Q

How are the brake lines connected in a diagonally split brake system?

A

Left front with the rear right, and the right front with the left rear.

33
Q

How are the brake lines connected in a longitudinally split brake system?

A

Front to rear, the fronts connect and then the rear connect together.

34
Q

What are the 2 types of brake sensors?

A

A fluid level warning sensor, a brake light sensor/switch is usually found on the brake pedal assembly

35
Q

Describe power brakes.

A

Assist in braking when the pedal is depressed

36
Q

Describe a hydraulic brake booster.

A

Hydraulic pressure is applied by the power steering pump

37
Q

Describe the vacuum booster.

A

Works with vacuum generated by the engine

38
Q

Describe the electric booster.

A

Uses an electric motor to generate additional pressure

39
Q

Describe a metering valve.

A

to slightly delay the application of the front brakes. Equalizes brake action at each wheel

40
Q

Describe the proportioning valve.

A

Provide balanced braking during sudden, hard braking by restricting fluid pressure to the rear brakes.

41
Q

What brake system is a metering valve used in?

A

Used in line with front disc and rear drum brake systems, with a longitudinally split master cylinder.

42
Q

What brake system is a proportioning valve used in?

A

In vehicles with front disc, rear drum brake systems.

43
Q

Describe a combination valve.

A

Incorporates a metering valve, a proportioning valve and a pressure differential warning switch all into one assembly

44
Q

What is the most common configurations for drum brake shoes?

A

Are duel servo and leading/trailing

45
Q

Describe servo action.

A

Refers to one brake shoe being used to apply the other shoe

46
Q

Describe duel servo.

A

Simply means that servo action occurs in both froward and reverse. The rear shoe will energize first and is responsible for a higher amount of the braking force.

47
Q

In dual servo drum configurations the _____ shoe is usually _______ than the ______ shoe.

A

Rear shoe, larger, front shoe

48
Q

Describe a leading/trailing system.

A

Front shoe will energize when moving forward and the rear shoe will energize while moving backwards. This system requires more force, less prone to locking up.

49
Q

What are some disadvantages in the disc brake assembly?

A

More effort is required to apply disc brakes because that are not self energizing
Disc brakes are more prone to cause noise

50
Q

What are the advantages of disc brake assembly?

A
  • uses less parts
  • dissipate heat better
  • less prone to brake fade
  • self clean
  • self adjust
  • force is applied more rapidly and evenly
51
Q

Describe a fixed brake caliber.

A

The entire caliber is solidly mounted and there is a piston or pistons on both sides of the disc.

52
Q

Describe a floating brake caliber.

A

A caliber bracket is solidly mounted and the caliber itself within that bracket isn’t solidly mounted, it can slide.

53
Q

What are the 3 main types of park brake assemblies?

A

Drum brake, disc brake, drum in hat.

54
Q

Describe the drum brake type parking brake assembly.

A

Rear drum brake assembly used to hold vehicle stationary. Is a cable or linkage attracted to a park brake lever which, when applied holds the shoes tightly against the drum.

55
Q

Describe the disc brake type of parking brake assembly.

A

Rear disc assemblies used to hold vehicle stationary. Is a cable or electric motor attached directly to the brake caliber. When applied the inner brake pad is pressed firmly against the rotor.

56
Q

Describe the drum in hat type of parking brake assembly.

A

Uses a combination of rear disc brakes for stopping the vehicle, and a separate drum brake system for the parking brake.

57
Q

What is the minimum thickness of riveted brake pads?

A

1.5mm to rivets

58
Q

What is the minimum thickness of non riveted brake pads?

A

3mm to pad body

59
Q

What is the minimum thickness on riveted brake shoes?

A

1mm to rivets

60
Q

What is the minimum thickness of non riveted brake shoes?

A

1.5mm to shoe body

61
Q

What controls a ABS system?

A

Wheel speed sensors, an ABS computer

62
Q

A brake service is usually recommended very_______kms?

A

32,000kms

63
Q

What does a disc brake service usually include?

A
  • removing brake pads contact points
  • lubricating contact points
  • remove and dust/lip from rotors
  • hand sand friction surface of rotor
  • sand friction surface of brake pads
  • clean and lub calliper slide pins
  • adjust park brake shoes if applicable (drum in hat style)
64
Q

What does a drum brake service usually include?

A
  • cleaning brake dust
  • lub contact points for shoes
  • sand friction surfaces on brake shoes
  • remove any rust/lip on brake drums
  • sand friction surface of brake drum
  • adjust brake shoes

Motive Action (14 decks)

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