cdl air brake

53問 • 1年前

ユーザ名非公開

通報

問題一覧

During normal, spring brakes are usually held back by ?

air pressure

The break pedal in an air break system ?

controls the air pressure applied to put on the brakes

The brakes system that applied and releases the brakes when the driver uses the brake pedal is what system?

service system

All air brakes equipped vehicles must have what?

a supply pressure guage

If your truck or bus has a dual parking control value, you can use pressure from another tank to ?

release the spring brakes to move vehicle in an emergency

The most common type of foundation brake found on heavy vehicle is the ?

s-cam drum brakes

Parking or emergency brakes if trucks and buses can be legally held on by what?

spring pressure

If your vehicle had and alcohol evaporator, is is there to ?

reduce the risk of ice in value and other parts in cold weather

Some air brakes system have alcohol evaporator. What might happen if you don’t keep the unit full with alcohol?

ice may form in the tanks and cause the brakes to fail

The most important thing to do when the low air pressure warning comes on is ?

stop and park safely as soon as possible

The driver must be able to see a low air pressure warning that must come on before pressure in the thank fall below what ?

60 psi

Under normal conditions, in order to engage the parking brake the driver must first ?

let the air out of the system

To check the free play of manual slack adjusters on s-cam brakes, you should park on?

level ground,chock the wheels,and release the parking brake

For air brakes system in good condition, the air compressor should start pumping at what psi?

100

A straight truck or bus system should not leak at a rate of more than ? Psi per minute with the engine off and the brakes released?

2 psi

A slack adjuster probably need adjustment if it moves more than ? Inch when you pull on it.

1 inch

If you are driving down a steep downgrade and you have reached your safe speed of 40 mph, you should apply the service brakes until your speed reaches what?

35 mph

The use of brakes on a long and/or steep downgrade is only a supplement to ?

the braking effect of the engine

Under ideal conditions, a truck with air brakes going 55 mph would require a stopping distance of what?

more than 300 feet

Emergency stab braking is when you ?

brake as hard as you can, release the brakes when the wheel lock, and apply the brakes again when the wheels roll

The braking power of the spring brake?

depends on the brakes being in adjustment

If you must make an emergency stop you should brake so you ?

can keep your vehicle in a straight line and turn if it becomes necessary

The proper method of braking when going downhill is to reduce your speed by ? Mph below your safe speed before releasing the brakes?

5 mph

Which of the following about ABs is true?

ABS changes the way you brake in an emergency

If your ABS is not working, you should?

drive normally, but get the service soon

The stop light switch ?

turn on the break lights to warn others behind you

If air pressure does not build up to normal within the correct amount of time ?

your air pressure may drop to low while driving, require an emergency stop

If the spring brakes are on, when should you push the brake pedal?

never

If your trucks compressor has it own oil supply,when should you first check the oil level?

before driving

The safety value is set automatically to reduce pressure in the tanks at what psi?

150 psi

The air loss rate for a straight truck or bus with the engine off and the brakes on should not be more than what?

3psi in 1minute

Air brakes takes more time to stop hydraulic brakes because?

air takes more time to flow through the lines than hydraulic fluid

In air brake vehicles, the parking brake should be used ?

anytime the vehicle is parked

Which of these is not a proper time to apply the parking brakes ?

if the brakes are very hot

Emergency controlled braking is when you ?

apply the brakes as hard as you can without locking the wheels

The application pressure gauge show how much pressure ?

you are applying to the brakes

The supply pressure gauge shows how much pressure ?

is in the air tank

How often should you drain the water end oil from your air tanks?

at the end of each day of driving

The spring brakes on a truck will bring it to a stop automatically, when air pressure falls to what range?

20-45 psi

The air compressor should start pumping at what psi?

125 psi

Modern air brakes combine 3 different systems?

the service,parking,and emergency brakes

The s-can ?

forces the brake shoes to the drums

If your truck has a dual air system, and 1 system is low on air pressure ?

either the front or rear brakes will not be operating fully

Excessive use of the service brakes results in overheating, which can lead to ?

expansion of the brake drum

If your truck has a properly functioning fuel air system, the pressure should build from 85 psi too 100 psi in how long?

45 seconds

You should know that your brakes are fading when ?

you have to push harder and harder on the brake pedal to control your speed

How should you check that your device brakes are working properly?

park on level ground, release parking brakes, roll forward slowly and apply the brakes using the pedal

Total stopping distance for air brakes is longer than hydraulics because of what ?

brake lag

Excessive heat caused by using your brakes too often can cause the ?

brakes to fade or fail

If a truck or bus has ABS, it will have a ? Malfunction lamp on the instrument panel.

yellow

The modulating control value allow you to operate the ?

spring brakes

Cracks in the drum can not be longer than ? the width of the friction area.

1/2

The air brake lag at 55 mph adds how much feet stopping distance?

32 feet

M#5 Section and Title v2

ユーザ名非公開 · 32問 · 13日前

M#5 Section and Title v2

MPLE

MPLE

Weekly Test 3

Weekly Test 3

Weekly Test 2

Weekly Test 2

Weekly Test 1

Weekly Test 1

Refresher SPDI 1

Refresher SPDI 1

Refresher SPDI 1

ユーザ名非公開 · 100問 · 13日前

Refresher SPDI 1

100問 • 13日前

ユーザ名非公開

Definition of Terms 3

ユーザ名非公開 · 90問 · 13日前

Definition of Terms 3

90問 • 13日前

ユーザ名非公開

Definition of Terms 2

ユーザ名非公開 · 90問 · 13日前

Definition of Terms 2

90問 • 13日前

ユーザ名非公開

Definition of Terms 1

ユーザ名非公開 · 90問 · 13日前

Definition of Terms 1

WT 6

WT 6

WT 3

WT 3

WT 2

WT 2

SPI version D pt 2

SPI version D pt 2

Standpipe Requirements

ユーザ名非公開 · 29問 · 13日前

Standpipe Requirements

29問 • 13日前

ユーザ名非公開

Item 311 Portland Cement Concrete Pavement (PART 2)

ユーザ名非公開 · 61問 · 13日前

Item 311 Portland Cement Concrete Pavement (PART 2)

61問 • 13日前

ユーザ名非公開

Principles and Code of Ethics

ユーザ名非公開 · 29問 · 13日前

Principles and Code of Ethics

29問 • 13日前

ユーザ名非公開

RNPCP Chapter 10 to 13

ユーザ名非公開 · 93問 · 13日前

RNPCP Chapter 10 to 13

RNPCP Chapter 6 to 9

RNPCP Chapter 6 to 9

Item 303 Bituminous Seal Coat

ユーザ名非公開 · 20問 · 13日前

Item 303 Bituminous Seal Coat

20問 • 13日前

ユーザ名非公開

問題一覧

During normal, spring brakes are usually held back by ?

air pressure

The break pedal in an air break system ?

controls the air pressure applied to put on the brakes

The brakes system that applied and releases the brakes when the driver uses the brake pedal is what system?

service system

All air brakes equipped vehicles must have what?

a supply pressure guage

If your truck or bus has a dual parking control value, you can use pressure from another tank to ?

release the spring brakes to move vehicle in an emergency

The most common type of foundation brake found on heavy vehicle is the ?

s-cam drum brakes

Parking or emergency brakes if trucks and buses can be legally held on by what?

spring pressure

If your vehicle had and alcohol evaporator, is is there to ?

reduce the risk of ice in value and other parts in cold weather

Some air brakes system have alcohol evaporator. What might happen if you don’t keep the unit full with alcohol?

ice may form in the tanks and cause the brakes to fail

The most important thing to do when the low air pressure warning comes on is ?

stop and park safely as soon as possible

The driver must be able to see a low air pressure warning that must come on before pressure in the thank fall below what ?

60 psi

Under normal conditions, in order to engage the parking brake the driver must first ?

let the air out of the system

To check the free play of manual slack adjusters on s-cam brakes, you should park on?

level ground,chock the wheels,and release the parking brake

For air brakes system in good condition, the air compressor should start pumping at what psi?

100

A straight truck or bus system should not leak at a rate of more than ? Psi per minute with the engine off and the brakes released?

2 psi

A slack adjuster probably need adjustment if it moves more than ? Inch when you pull on it.

1 inch

If you are driving down a steep downgrade and you have reached your safe speed of 40 mph, you should apply the service brakes until your speed reaches what?

35 mph

The use of brakes on a long and/or steep downgrade is only a supplement to ?

the braking effect of the engine

Under ideal conditions, a truck with air brakes going 55 mph would require a stopping distance of what?

more than 300 feet

Emergency stab braking is when you ?

brake as hard as you can, release the brakes when the wheel lock, and apply the brakes again when the wheels roll

The braking power of the spring brake?

depends on the brakes being in adjustment

If you must make an emergency stop you should brake so you ?

can keep your vehicle in a straight line and turn if it becomes necessary

The proper method of braking when going downhill is to reduce your speed by ? Mph below your safe speed before releasing the brakes?

5 mph

Which of the following about ABs is true?

ABS changes the way you brake in an emergency

If your ABS is not working, you should?

drive normally, but get the service soon

The stop light switch ?

turn on the break lights to warn others behind you

If air pressure does not build up to normal within the correct amount of time ?

your air pressure may drop to low while driving, require an emergency stop

If the spring brakes are on, when should you push the brake pedal?

never

If your trucks compressor has it own oil supply,when should you first check the oil level?

before driving

The safety value is set automatically to reduce pressure in the tanks at what psi?

150 psi

The air loss rate for a straight truck or bus with the engine off and the brakes on should not be more than what?

3psi in 1minute

Air brakes takes more time to stop hydraulic brakes because?

air takes more time to flow through the lines than hydraulic fluid

In air brake vehicles, the parking brake should be used ?

anytime the vehicle is parked

Which of these is not a proper time to apply the parking brakes ?

if the brakes are very hot

Emergency controlled braking is when you ?

apply the brakes as hard as you can without locking the wheels

The application pressure gauge show how much pressure ?

you are applying to the brakes

The supply pressure gauge shows how much pressure ?

is in the air tank

How often should you drain the water end oil from your air tanks?

at the end of each day of driving

The spring brakes on a truck will bring it to a stop automatically, when air pressure falls to what range?

20-45 psi

The air compressor should start pumping at what psi?

125 psi

Modern air brakes combine 3 different systems?

the service,parking,and emergency brakes

The s-can ?

forces the brake shoes to the drums

If your truck has a dual air system, and 1 system is low on air pressure ?

either the front or rear brakes will not be operating fully

Excessive use of the service brakes results in overheating, which can lead to ?

expansion of the brake drum

If your truck has a properly functioning fuel air system, the pressure should build from 85 psi too 100 psi in how long?

45 seconds

You should know that your brakes are fading when ?

you have to push harder and harder on the brake pedal to control your speed

How should you check that your device brakes are working properly?

park on level ground, release parking brakes, roll forward slowly and apply the brakes using the pedal

Total stopping distance for air brakes is longer than hydraulics because of what ?

brake lag

Excessive heat caused by using your brakes too often can cause the ?

brakes to fade or fail

If a truck or bus has ABS, it will have a ? Malfunction lamp on the instrument panel.

yellow

The modulating control value allow you to operate the ?

spring brakes

Cracks in the drum can not be longer than ? the width of the friction area.

1/2

The air brake lag at 55 mph adds how much feet stopping distance?

32 feet