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GA Class A > Air Brakes > Flashcards

Air Brakes Flashcards

1
Q

a low air pressure warning signal should activate

A

when tank pressure falls below 55 psi

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2
Q

why should you regularly drain the air tanks

A

because compressed air contains some water and the water collects in the tanks

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3
Q

vehicles equipped with anti-lock braking systems (ABS) have ___ malfunctioning lamps to indicate when the ABS is not working

A

yellow

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4
Q

a dual air brake system

A

consist of two separate air brake systems that share a single set of controls.

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5
Q

the safety valve is set to open up at ____ pounds per square inch (psi)

A

150

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6
Q

air pressure should build up in a single air system within

A

3 minutes

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7
Q

some air brake systems use alcohol

A

to reduce the risk of ice forming in air brake valves

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8
Q

spring breaks come on

A

when too much air pressure is lost.

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9
Q

on trucks and buses where are ABS malfunction lamps located?

A

on the instrument panel.

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10
Q

before driving a vehicle with dual air brake systems you must wait for the air compressor to build a minimum of ____ in both the primary and secondary systems

A

100 PSI

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11
Q

anti-lock braking systems (ABS)

A

are equipped in addition to other braking systems and do not reduce normal braking power.

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12
Q

if using air tanks with manual operated drains how often should you drain the tanks

A

every day

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13
Q

the parking brake should be

A

use whenever you park your vehicle.

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14
Q

if the brake pads rub against the brake drums and create too much heat

A

the brakes may stop working.

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15
Q

a low air pressure warning signal

A

is required on vehicles with air brakes

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16
Q

foundation brakes are used

A

at each wheel

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17
Q

the air compressor governor controls

A

when the air compressor pumps air into the air storage tanks

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18
Q

when traveling down a steep downgrade

A

shift into a lower gear then use brakes to supplement the breaking effort of the engine.

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19
Q

to confirm that the trailer has ABS you can

A

look under the trailer for wheel speed sensors coming from the back of the brakes.

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20
Q

dollies equipped with abs are required to have malfunction lamps located

A

on the left side

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21
Q

The ___ tell the driver how much pressure is in the air brakes

A

supply pressure gauge

22
Q

when inspecting your brakes a slack adjuster should move ____ from where it is attached to the push rod

A

no more than one inch

23
Q

before driving a vehicle with air brakes you should ensure that the spring breaks come on automatically when

A

air pressure falls below 45 PSI

24
Q

during an applied leakage test the maximum leakage rate of a double combination vehicle is

A

4 psi in a minute

25
Q

during an applied leakage test the maximum leakage rate for a triple combination vehicle is

A

6 psi I in a minute

26
Q

front wheel breaking works

A

under all conditions

27
Q

when you press the brake pedal in a vehicle with s-cam brakes air pressure pushes out the rod and moves the

A

slack adjuster

28
Q

friction inside a brake drums is caused when the brake shoes and linings

A

push against the inside of the drum.

29
Q

breaking mechanisms are located ____ a brake drum

A

inside

30
Q

when a brake pedal is pressed and the s-cam is turned, the s-cam

A

princess the brake shoes against the inside of the brake drum

31
Q

to inspect slack adjusters on s-cam brakes you need to

A

chock the wheels and disengage the parking brake

32
Q

how should you test the low pressure warning signal

A

rapidly press and release the brake pedal

33
Q

before starting down a hill be sure to

A

switch into a low gear.

34
Q

during the applied leakage test the maximum leakage rate for a single vehicle with air brakes is

A

3 psiI in one minute

35
Q

during a static leakage test the maximum leakage rate for a double combination vehicle is

A

3 psii in one minute

36
Q

during a static leakage test the maximum leakage rate for a triple combination vehicle with air brakes is ___ in a minute

A

5 psi

37
Q

during a static leakage test the maximum leakage rate for a single vehicle with air brakes is ___ in one minute

A

2 psi

38
Q

while driving spring breaks are generally held in place by

A

air pressure

39
Q

the emergency brake system uses

A

parts of both the parking in service brake systems.

40
Q

a modulating control valve can’t control the

A

spring breaks

41
Q

during a walk around inspection ensure there are no cracks on the brake drums that are more than____ of with of the friction area

A

one half

42
Q

the air pressure in a dual air brake system should build up from 85 to 100 psi within

A

45 seconds

43
Q

in cold weather and alcohol evaporator should be checked and filled

A

every day

44
Q

applying the brake pedal causes air pressure to activate the electric switch and

A

turn on the brake lights

45
Q

a one-way check valve

A

prevents air from escaping if the air compressioner has a leak

46
Q

an air compressor governor will stop the compressor from pumping air once the air tanks have an air pressure level of

A

125 psi

47
Q

while driving downhill you should break until you reach a speed that is____ below your safe speed and then release the brake pedal

A

5 mph

48
Q

when you need to stop in an emergency you should

A

stop in a way that keeps your vehicle in a straight line.

49
Q

if breaking at a speed of 55 mph while driving on dry pavement the brake lag can add ____ to your vehicles total stopping distance

A

32 feet

50
Q

an air brake equipped vehicle traveling at a speed of 55 mph under ideal driver conditions we need approximately ____ to come to a complete stop

A

450 feet

GA Class A (3 decks)

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