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190105 air brakes fundementals > 190105cA truck/tractor air brake system components - part A > Flashcards

190105cA truck/tractor air brake system components - part A Flashcards

1
Q

what’s the purpose of a dual air brake system?

pg.2

A

greater safety incase one service circuit false

pg.2

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2
Q

witch supply tank operates steering axle and witch operates drive axle?
pg.2

A

primary circuit operates = drive axle(s)
secondary circuit operates = steer axle
pg.2

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3
Q

what are the 5 basic circuits? name there colors

pg.2

A
  • supply [blue]
  • primary [green]
  • secondary [red]
  • parking/emergency brake circuit [orange]
  • trailer control circuit [unknown]
    pg. 2
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4
Q

what’s the purpose of the supply circuit?

pg.3

A
  • provide brakes and accessories with clean dry air
  • maintain system pressure
    pg. 3
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5
Q

what are the components in a the supply circuit

pg.3

A
  • compressor
  • posture and contamination control
  • reservoirs
  • governor
    pg. 3
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6
Q

what are 2 common types of compressors?

what is the more common type of driving an air compressor?

compressor output unit is___
pg.4

A
  • single stage
  • reciprocating type
  • gear drive
  • cfm
    pg. 4
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7
Q

what are the 2 valves and 1 piston i need to remember from the compressor?
pg.5

A
  • discharge valve
  • inlet valve
  • unloader piston/plunger
    pg. 5
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8
Q

compressor has 2 cycles, what are they?

pg.6

A
  • unloaded cycle
  • loaded cycle
    pg. 6
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9
Q

compressor kick out pressure is?
compressor kick in pressure is?
pg.8, 12

A

115 - 135 psi
25 psi less then kick out
pg.8, 12

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10
Q

governor pressure adjusting spring, adjusting screw and locknut is to adjust what?
pg.9

A

kick out pressure

pg.9

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11
Q

what’s the 3 ports in a compressor governor?

pg.9

A
  • exhaust (EXH)
  • unloader (UNL)
  • reservoir (RES)
    pg. 9
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12
Q

water and oil in the system causes what?

pg.12

A
  • in the winter water freezes and causes brake malfunctions
  • water and oil mix, creating slush, causing valves to stick
    pg. 12
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13
Q

what material is inside an air dryer cartridge? and what do they do with moisture?
pg.19

A

desiccant material and they suspend moisture and moisture vapour
pg.19

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14
Q

acronym for supply port and delivery port

pg.19

A
  • SUP (supply port)
  • DEL (delivery port)
    pg. 19
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15
Q

how big most the reservoirs be?

pg.20

A

atlas 12 times the combined volume of the brake chamber on the unit
pg.20

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16
Q

pressure reservoirs must be hydrostatically tested to _____

pg.20

A

5 times the related working pressure

pg.20

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17
Q

what is the purpose of a supply reservoir?

pg.23

A
  • supply additional air volume
  • be a final place for moisture to settle
    pg. 23
18
Q

purpose of a check valve at primary and secondary resevoirs?

pg.23

A

ensures at least one service reservoir remains charged in the even that the other loses air pressure
pg.23

19
Q

what’s the safety valve for?
where can it be located?
at what pressure does the safety valve vent at?
how do you check safety valve operations?
pg.24

A
  • incase the governor fails it prevents the system from over pressurizing
  • compressor, air dryer and supply reservoir (most common)
  • 150 psi
  • pull on the pin
    pg. 23
20
Q

what type of gauge is used to determine reservoirs pressure?
witch reservoirs need a pressure gauge?
pg.25

A
  • dual-needle pressure gauge
  • primary res and secondary res
    pg. 25
21
Q

how does a low pressure warning device work?

pg.26

A

when pressure drops in the primary and/or secondary to 60 or less a visual and audible devise warns the driver.
(now a days it goes off at 68-74 psi)
pg.26

22
Q

what size must tubing, hoses and fitting can they be replaced with? what type of threads are most common?
pg.27

A

THE SAME SIEZE. NPT

pg.27

23
Q

what are air lines more commonly made of?

pg.28

A

nylon tubing

pg.28

24
Q

where can nylon tubing not be used?

pg.28

A 
- where heat is above 93 C
       compressor discharge
- high wear, abrasion or movement is encountered
       vehicle frame to brake chambers
pg.28
25
Q

when talking about air brakes, what type of connection is more popular for steel tubing? why?
pg.29

A

compression fittings, because flared connections are susceptible to fatigue from vibration
pg.29

26
Q

flexible hose is used for?

pg.29

A

used to connect brake chambers

pg.29

27
Q

what type of hose is used for compressor discharge lines?

pg.29

A

hoses with extruded teflon inner cores and outer stainless steel braid
pg.29

28
Q

what’s the purpose of the primary service brake circuit?

pg.30

A

to allow the operator to control the application and release of the drive axle rakes
pg.30

29
Q

primary service circuit consist of what components?

pg.31

A
  • dual-circuit brake valves
  • relay valve
  • service brake chambers
    pg. 31
30
Q

purpose of the dual-circuit brake valve

pg.32

A

give the operator control of the brakes on the vehicle

pg.32

31
Q

3 things that brake valve allows the operator to do is?

pg.32

A
  • apply the brakes
  • release the brakes
  • regulate brake application
    pg. 32
32
Q

types of dual circuit brake valves

pg.32

A
  • treadle valve (floor mounted)
  • pedal valve ( firewall mounted)
    pg. 32
33
Q

what type of air does the dual-circuit brake valve deliver?

pg.34

A

signal air to the service relay

pg.34

34
Q

when the dual-circuit brake valve is released, applied and balanced. what are the inlet and exhaust ports doing?
pg.36

A

released = inlet CLOSED and exhaust OPEN
applied = inlet OPEN and exhaust CLOSED
balanced = inlet CLOSED and exhaust CLOSED
pg.36

35
Q

whats the purpose of the service relay valve and where would it be located?
pg.38

A
  • the purpose is to speed up application and release time.
  • it’s located near the primary service brake chambers
    pg. 38
36
Q

how does the service relay work?

pg.38

A
  • air volume will be supplied from the primary reservoir to the supply port of the service port
  • a signal line from the dual-circuit valve will connect to the control port of the service relay. this signal will activate the service relay

small air amount controlling large air amount
pg.38

37
Q

the amount of air that is required to get the relay valve piston to move downwards, close the exhaust valve and open the inlet valve is called?
pg.41

A

cracking pressure

pg.41

38
Q

what’s the function of the service brake chamber?
shortly describe it it works?
pg.44

A
  • to convert the energy of the compressed air into mechanical energy.
  • compressed air enters and pushes on the diaphragm tp apply the brakes
  • the return spring on the brake shoes and the return inside the brake chamber return the pushrod
    pg. 44
39
Q

whats the purpose of the secondary service circuit?

pg.46

A

to allow the operator to control the application and release of the steer axle brakes
pg.47

40
Q

what’s included in the secondary service circuit components?

pg.47

A
  • dual-circuit brake valve
  • quick release valve
  • modulator valve
  • steer axle service brake chambers
    pg. 47

190105 air brakes fundementals (3 decks)

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