section 5 air brakes Flashcards

1
Q

what are the three different break systems of air breaks

A

Service breaks , parking breaks , and emergency breaks

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2
Q

What does the service breaks do

A

Applies and releases the breaks when you use the break pedal during normal driving

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3
Q

What do the parking breaks do

A

applies and releases the parking breaks when using the parking breaks control

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4
Q

What do the emergency breaks do

A

uses parts of the service and parking brake system to stop in a break system failure

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5
Q

what does the air compressor do

A

pumps air into the air storager tanks (Resovoir)

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6
Q

what does the air compressor governor do

A

Controls when the air compressor will pump air into the air storager tanks.

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7
Q

what turns the compressor on and off

A

the key

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8
Q

what are air storage tanks used for

A

Air storage tanks are used to hold compressed air

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9
Q

What happens when water catches in the compressed air

A

comrpressed air usually has some water and some oil in it which is bad for air breaks , water can freeze in cold weather and cause break failure

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10
Q

what should you do with air tanks manually at end of shift

A

you must drain the tank yourself at the end of each shift

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11
Q

What is the purpose of the alchohol evaporator

A

Puts alchohol into the system to help reduce ice in brake valves

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12
Q
A

Check achohol container as neccasary during cold weather

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13
Q
A

safety valve is installed in first tank the air compressor pumps air to

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14
Q
A

pushing down the brake pedal

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15
Q
A

pushing the pedal down harder than neccasary

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16
Q
A

foundation brakes are on every wheel most common being s cam drum brake q

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17
Q

brake fade

A

too much heat can cause the brakes to stop working

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18
Q
A

when you push the brake pedak air is let out into each

18
Q

Do you need a pressure gauge?

A

all vehicles with air brakes must have a pressure gauge connected to air tank

19
Q

what does the application pressure gauge do

A

shows how much air pressure you are applying to brakes

20
Q

20 -45 psi

A

when emergency brakes apply

21
Q

55pi

A

alarm sounds before pressure falls to dangerously low

22
Q

100pi

A

governor cuts in normal pressure

23
Q

125 pi

A

governor cuts out full pressure

24
Q

150 psi

A

the safety valve releases air from tanks

25
Q

wig wag warning

A

warning for when psi is under 55

26
Q

stop light switch

A

the air brakes system warns drivers behind you when you put on the breaks

27
Q

front brake limiting valve when put on slippery reduces stopping power by how much

A

1/2

28
Q

when to use front brake limiting valve

A

never use front brake limiting valve

29
Q

what are emergency breaks and parking breaks held on by

A

mechanical spring pressure

30
Q

what holds springs together

A

Air pressure

31
Q

when will spring breaks fully come on automatically

A

spring breaks will come on fully when psi drops from range of 20-45psi

32
Q

what does the braking power of the spring brake depend on

A

the brakes being adjusted proper

33
Q

what does parking brakes look like and color

A

In newer vehicles with air brakes you put on the parking brake using a diamond shaped yellow push pull control knob

34
Q

what is compounding the brakes

A

never push down on the air brakes when springs are active or you’ll end up compounding brakes

35
Q

dual parking control valves

A

when main air pressure is lost, the spring breaks come on ,some vehicles like buses have a separate air tank for emergency

36
Q

what stops air from escaping the air tank

A

The one way check valve

37
Q

what is the wet tank

A

first tank the first one

38
Q

min psi for primary and secondary system

A

100psi

39
Q

what to do if low air pressure drops below 55

A

safely stop and park vehicle have air brake system fixed

40
Q

during step 5 of walk though inspection

A

check slack adjusters on s-cam , park on level ground , release parking brakes to adjust slackers

41
Q

how long can a crack not be on brake drums

A

half the width of the friction area

42
Q
A