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Air Brake Component Definitions Flashcards

(57 cards)

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1
Q

Air brakes

A

Braking system where the brakes are applied by air pressure

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2
Q

Air over hydraulic Brakes

A

A braking system where the brakes are applied by hydraulics, but application is made by air pressure

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3
Q

Air dryer

A

A Filter that removes liquid and water vapour from the air before it reaches the reservoir

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4
Q

Air pressure gauge

A

A dash mounted gauge telling the driver how much air pressure is in the primary and secondary reservoir

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5
Q

Application pressure guage

A

A dash mounted gauge which tells the driver the amount of air pressure being delivered when breaks are applied

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6
Q

Blended air

A

Air taken from the primary and secondary circuits

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7
Q

Brake fade

A

Loss of breaking efficiency due to overheating the brakes

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8
Q

Brake lag

A

The time required for air to flow through the system when breaks our applied

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9
Q

Brake pads

A

Steel plates with lining which squeeze against the rotor

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10
Q

Brake Potts

A

Term sometimes used to describe the brake chambers

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11
Q

Brake drums

A

Large cast-iron drums located behind each wheel on the vehicle equipped with drum brakes, shoes are forced against them when the brakes are applied creating function which stops the vehicle. Break drums also dissipate heat.

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12
Q

Brake rotor

A

A steel disc located behind each wheel on vehicles equipped with disc brakes. the pads squeeze against it when the brakes are applied

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13
Q

Brake shoes

A

Curved steel plates with an outer lining which press against the brake drums when the brakes are applied

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14
Q

Breakaway

A

When the trailer disconnects from the tractor

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15
Q

Caging

A

The manual release of the spring brake chamber using the wind-off bolt

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16
Q

Compounding

A

Making service break applications when the parking brake is applied

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17
Q

Compressor

A

A pump operated from the engine which builds and maintains air pressure

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18
Q

Cut-in

A

The point of which the governor allows the compressor to resume pumping

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19
Q

Cut-out

A

The point of which the pressure in the system has reached maximum capacity, and the governor stops the compressor from pumping

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20
Q

Diaphragm

A

A heavy rubber partition in the brake chamber, which activates the brakes when air is forced against it

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21
Q

Draincocks

A

Drain valves mounted on each reservoir so they can be drained of moisture and other contaminants

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22
Q

Dynamiting

A

Slang term for an emergency application of the brakes due to sudden air loss

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23
Q

Emergency line

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A

A term sometimes used to describe the supply line

24
Q

Firewall

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A

The metal panel between the cab and the engine compartment

25
Foot valve
A foot operated valve used to apply the brakes
26
Front able ratio valve
A valve which reduces application pressure to the front brakes
27
Fulcrum
The point or support on which a lever pivots
28
Gladhands
The coupling devices used to connect the airlines from the tractor to the trailer
29
Hand valve
A hand operated valve which only applies the trailer brakes
30
Loading
A term used to describe cut-in
31
Low-warning device
A light or buzzer which warns the driver of low air pressure
32
Low warning switch
A switch which activates the low warning device
33
Parking brake valve
A yellow diamond-shaped valve mounted on the dash that activates the parking brakes
34
Piggyback
A term sometimes used to describe the spring brake chamber
35
Pop-off-valve
A term sometimes used to describe the safety valve
36
Primary reservoir
A tank that normally supplies air to the brake on the rear axles
37
Quick release valve
A valve which exhausts air quickly to reduce release time
38
Relay emergency valve
A valve located on or near the trailer reservoir on a trailer without spring brakes
39
Relay valve
A valve which reduces brake lag
40
Reservoirs
Tanks where the air is stored
41
Safety valve
A valve mounted on the reservoir to prevent over-pressurization
42
S-cam
A rotating S-shaped cam which activates the brake shoes
43
Secondary reservoir
A tank that normally supplies air to the brakes on the steering axle
44
Service brake chamber
A chamber which converts air pressure into mechanical force when the brakes are applied
45
Service line
The rubber hose connecting the tractor and trailer. Air flows through it when the brakes are applied
46
Slack adjusters
Devices used to manually or automatically keep the brakes in proper adjustment
47
Spike
A term sometimes used to describe the hand valve
48
Spring brake chambers
A chamber housing a large powerful spring which applies the brakes if there is an air loss or as a parking brake
49
Supply line
The rubber hose connecting the tractor and trailer. Air flows through it when the trailer supply valve is opened. Sometimes call the emergency line.
50
Supply reservoir
The first tank where air is stored when it comes from the compressor. It supplies clean, dry air to the resin system.
51
Trailer protection system
A series of two valves which prevent air loss from the tractor if a trailer breaks away
52
Trailer supply valve
A red octagonal valve mounted on the dash which supplies air to the trailer
53
Two-way check valve
A valve which ensure a steady supply of air in the event of an air loss in one system
54
μm
A unit of measurement. 2.5μms= 2.5/1000 of a millimetre or the thickness of three sheets of paper
55
Unloading
A term used to describe cut-out
56
Wet-tank
A term sometimes used to describe the supply reservoir
57
Wind-off bolt
A device on the brake chambers used to manually release the spring brakes

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