CDL Air Brakes Study Guide #2

Dit bestand kan niet worden geopend, omdat JavaScript niet aanstaat in je browser. Zet JavaScript aan en laad het bestand opnieuw.

E-mailadres *

A slack adjuster’s free play needs to be adjusted if it is more than about ___ when you pull hard on it. *

1 punt

1/4 inch

1/2 inch

1 inch

For air brake systems in good condition, the air compressor should start pumping at about ___ PSI. *

1 punt

100

125

150

Front wheel brakes are good under all conditions. *

1 punt

True

False

What is the first thing you should do when a low air pressure warning comes on? *

1 punt

Upshift

Downshift

Stop and safely park as soon as possible

Repeatedly pressing and releasing (fanning) the brake pedal may result in: *

1 punt

The loss of brake air pressure

A buildup of brake air pressure

No change of brake air pressure

Anders:

Before driving a truck or bus with a dual air brake system, the pressure in each air brake system should be at least ____ PSI. *

1 punt

100

120

If your truck has a properly functioning dual air brake system and minimum size air tanks, the air pressure should build from 85 to 100 PSI within _____ seconds. *

1 punt

The modulating control valve allows you to control the: *

1 punt

Spring brakes

Front brakes

Amount of pressure in brake system

When you apply your brakes, the air brake system works with an electric switch, by air pressure, to turn on the brake lights. *

1 punt

True

False

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

1 punt

Only when driving downhill

Only on slippery roads

Never

Total stopping distance for air brakes is longer than that for hydraulic brakes due to ___ distance. *

1 punt

Brake lag

Reaction distance

Effective braking

Air braking takes more time than hydraulic braking because air: *

1 punt

Takes more time to flow through the lines than hydraulic fluid

Air brakes use different brake drums

Brakes require heavier return springs

Some air brake systems have an alcohol evaporator. What may happen if you don’t keep the unit filled with alcohol? *

1 punt

The S-cam may not rotate back when you release the brake pedal

Ice may form in the air storage tanks and cause the brakes to fail

Ice may form on the brake pads and warp them

What do air brakes use to make the brakes work? *

1 punt

Compressed gas

Compressed oil

Compressed air

How should you check that the spring brakes come on when the air pressure in the system drops below a certain level? *

1 punt

Park on a slight incline, drain off air pressure, set parking brakes and check for movement

Park on level ground, chock the wheels, release the parking brake when you have enough air pressure, shut the engine off, and repeatedly press and release the brake pedal

Park on level ground, wait for normal air pressure, release the parking brake, move the truck forward slowly, and apply the brakes firmly using the brake pedal

When of these is NOT a proper time to apply the parking brakes? *

1 punt

If your brakes are very hot

To use parking brakes if you park for less than 1 hour

If you are going to use the parking brakes you need to make sure that they will hold the vehicle

An air brake system is fully charged at what PSI? *

1 punt

125

150

The brake pedal in an air brake system: *

1 punt

Controls the speed of the air compressor

Controls the air pressure applied to put on the brakes

Is connected to slack adjusters by a series of rods and linkages

All vehicles with air brakes must have a low pressure warning signal. *

1 punt

True

False

It is accepted that too much heat caused by using your brakes too often can also cause: *

1 punt

Modulated control valve to wear out

Brake linings to split up

Brake fade or failure

Anders:

The S-cam: *

1 punt

Controls the flow of air to each of the brake chambers

Pulls the brake shoes away from the drum and allow the wheels to roll freely

Forces the brake shoes against the inside of the brake drum

The parking or emergency brake on a heavy vehicle can only be held in position by something that cannot leak away, like: *

1 punt

Spring pressure

Air pressure

Hydraulic pressure

Under normal conditions, in order to engage the parking brakes the driver must first: *

1 punt

Turn off the engine

Let the air out of the spring brakes

Be sure the air brakes system is fully pressurized

What are spring brakes? *

1 punt

Brakes used for slowing

If the air supply is lost, springs inside the brake chambers activate to stop the vehicle

The spring on the brake pedal

The brake system that applies and releases the brakes when the driver uses the brake pedal is the _____________ brake system. *

1 punt

Parking

Emergency

Service

Anders:

Verzenden

Formulier wissen

Verzend nooit wachtwoorden via Google Formulieren.

Dit formulier is gemaakt in Peaslee Tech. Misbruik rapporteren

Formulieren