Air Brakes Eng 2

Which of the following tells you how much pressure there is in the air tanks?

Stop-light switch
Application pressure gauge
Supply pressure gauge
Pressure tank

During inspections of your vehicle, what parts of the air brake system should be checked?

Manual slack adjusters on cam brakes S
Drums or brake discs; Air hoses connected to the brake chambers.
Air hoses connected to the brake chambers.
All previous

What are forced away from each other and against the inside of the brake drum by the S-cam?

The brake seals
The brake boots
The brake rings
The brake shoes

Which of the following options tells you how much pressure is in the air tanks?

Stop light switch
Application manometer
Supply manometer
Warning signal of low air pressure

Which of the following is a suitable technique for using controlled braking?

The brakes on very hard to lock the wheels.
Release the brakes if you need to make large address adjustments
Press the brakes harder when you feel the wheels slip
Turn the steering wheel while braking.

The main purpose of the alcohol evaporator is which of the following?

Put alcohol in the gas tanks.
Remove the alcohol from the compressor.
Remove the alcohol from the storage tank.
Put alcohol in the air system.

When driving a vehicle at 55 mph on a dry pavement and with good traction and braking conditions, what is the approximate total stopping distance necessary for your vehicle to come to a complete stop?

Two and a half times the length of the vehicle
Half the length of a football field.
Just about the length of a football field
The length of the vehicle plus 20 feet

How do disc brakes primarily differ from S-cam brakes?

Instead of an S-cam, disc brakes use a C-clamp.
Instead of an S-cam, disc brakes use a power screw.
Instead of separating the brake shoes with an S-cam, disc brakes separate them using a disc.
S-cam brakes have one chamber; disc brakes have two or more chambers.

What is the most common type of foundation brakes?

Shoe brakes
Wedge brakes
S-cam drum brakes
Disc brakes

Which of these should not be done during the final step of the basic seven-step inspection procedure?

Check brake drums (or discs), linings, and hoses.
Test low pressure warning signal.
Check air compressor governor cut-in and cut-out pressures.
Check that the spring brakes come on automatically.

What is the name of the device that pumps air into the air storage tanks?

Governor
Evaporator
Safety valve
Air compressor

Some air brake systems have an evaporator. What could happen if you don’t have the alcohol container filled up?

The air deposit tanks can be frozen and could cause brake failure
Brake drums can be frozen and it may bend them
It is possible that the S-cam won't rotate back when you release the break pedal
Brake failure is possible

Which of the following is a proper technique in using controlled braking?

the brakes on very hard to lock the wheels
Releasing the brakes if you need to make large steering adjustments
Pressing harder on the brakes when you feel the wheels sliding
All of the above

What does the modulated control valve allow you to control?

The front brakes
The air pressure amount of the brake system
The spring brakes
All of the above

What are the three types of brake systems used in a commercial vehicle air brake system?

Hand brake, parking brake, emergency brake
Service brake, parking brake, emergency brake
Anti-lock brake, service brake, emergency brake
Service brake, hand brake, emergency brake

Most newer heavy vehicles use dual air brake systems for safety. A double air brake system has which of the following?

Two separate air brake systems and two sets of brake controls.
Two separate air brake systems and a single set of brake controls.
One air brake system and two sets of brake controls.
An air brake system and a brake control.

The air brake lag distance at 55 mph on dry pavement adds about 32 feet, so under good traction and brake conditions, the total stopping distance is over how many feet?

300 feet
100 feet
500 feet
600 feet

When you push the brake pedal down, what force or forces push back against your foot?

The air pressure from the air brake system
The hydraulic system within the brake pedal
The hydraulic system within the brakes and the air pressure going to the brakes
The spring and the air pressure going to the brakes

Foundation brakes are used for during which of the following?

Only in emergencies.
When parking.
On each wheel.
On each axis.

What should be done when the spring brake low air pressure buzzer and warning light first come on?

Safely bring the vehicle to a stop while the service brakes are still functional.
Continue to the nearest convenient stopping point as the service braking system will retain enough functionality to drive safely for a short time.
Immediately use the emergency braking system.
Let the vehicle coast until the emergency braking system safely brings it to a stop.

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