Air Brakes Eng 5

¿Is an amount of freight that is less than what is required for the application of truckload rates?

FTL full load
Less Than Truckload (LTL)
Carry up to 7000 kilos
Half load

Modern air brake systems use three differents systems, they are service, hand (parking), and?

Pedal brakes
Emergency brakes
S-cam brakes
Disc brakes

What should you never do when the spring brakes are on?

Push the brake pedal down.
Press the gas pedal down.
Use the modulating valve.
Check the air in the air tanks.

What can a leak in the air brake system cause?

A loss of pressure in all braking systems
Backup generators to fill the emergency air tanks
The springs in the spring braking system to apply the brakes
The service brake system to retain minimal usability

A low air pressure warning comes on if the PSI is below ____.

50 psi
70 psi
80 psi
60 psi

From the following options, the first thing you must do when a low air pressure signal light is on, is…

Stop and park in a safe place as soon as posible
Adjust the break pedal to keep traveling
Open the air supply control valve
Open the safety valve

In checking that the spring brakes come on automatically, you should not:

Pull the parking brake control knob
Chock the wheels
Step on and off the brake pedal
All of the above

Checking the manual slack adjusters on the S-cam brakes should be done during what step of the basic seven-step inspection procedure?

Step 5: Do walkaround inspection.
Step 1: Do vehicle overview.
Step 2: Check engine compartments.
Step 7-Start the engine and check brake system.

Checking the air compressor drive belt should be done during what step of the basic seven-step inspection procedure?

Step 7: Start the engine and check brake system
Step 1: Do vehicle overview.
Step 5: Do walkaround inspection
Step 2-Check engine compartments.

Some vehicles have a modulating control valve. What does a modulating control valve do??

It enables you to gradually decrease the pressure being sent to the trailer brakes.
It enables you to switch from the air braking system to the spring brake system.
It enables you to put on the spring brakes gradually.
It enables you to increase or decrease the pressure of the air brakes.

Air brake systems are three braking systems combined. They are

Emergency, service, hand
Emergency, parking, service
Parking, service, hand
Parking, service, disc

What is the valve control modulating?

Start of the retarders
Used to apply the spring brakes gradually
Controls the compressor speed
Control the air compressor

Air brakes need more stopping distance than hydraulic brakes because…

The air brakes use brake drums different
The air goes through the lines more slowly than the hydraulic liquid does
The air brakes require heavier return springs
All of the above

Air brakes use

Hot air
Cold air
Compressed air
Air discs

A safety relief valve is installed in the first tank where the air compressor pumps air. The valve is usually configured to open at what psi level?

130
140
150
160

If your truck or bus has double parking control valves, you can use the pressure of a separate tank to?

Balance the service brake system when parked.
Release the emergency/parking brakes to move a short distance.
Brake harder if the main tank is running low.
Keep up your business.

Pressing and releasing the brake pedal unnecessarily can?

Change the air pressure of the brake
Accumulation of air pressure of the brake
let air go out and reduce the air pressure
Add more air to the brake system

Emergency controlled braking is when you:

Apply the hand valve for a second,cthen apply the brake pedal harder
Apply the brakes as hard as you can without locking the wheels
Apply the brakes as hard as you can, release the brakes when you lock the wheels and apply the brakes again when the wheels begin rolling
Release the brakes when the wheels are locked

If application pressure must be increased to maintain a certain speed while going down a steep grade, then this most likely means what?

There is an air leak.
There are other mechanical problems.
The brakes are fading and you should shift to a lower gear.
The brakes are out of adjustment.

Which of these is the correct way to use on the brakes?

If the brakes are too hot, after going down a steep road
Only been stopped at least one hour
You are going to check the parking brake to be sure that you can stop the vehicle
Apply emergency braking with abs

How does letting up on the brake pedal release the brakes?

Some compressed air is let out of the system, causing the brake pads to disengage.
The action releases the brake pads.
Compressed air is pushed back into the air tanks.
The system releases the brakes through a combination of air being released and the brake levers being loosened.

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