WorksheetsAir Brake System Quiz 3
Total questions: 25
Worksheet time: 20mins
The amount of pressure that is shown by the application pressure gauge is ______.
The amount available inside the tanks
The amount being vented into the atmosphere.
The amount that you are applying to the brakes.
Why do we need an S-cam?
Controls how much air goes into each of the brake chambers.
Frees the wheels by separating the brake shoes from the brake drum.
Pushes the brake shoe against the inside of the brake drum.
Which of the following types of foundation brakes are commonly found on air brake vehicles?
Air-over-hydraulic brakes.
S-cam drum brakes.
Wedge brakes.
Disc brakes
The modulating control valve allows you to control ___.
Steering axle brakes.
Rear brakes.
Spring brakes.
Air brakes.
How thick must the lining of the drum be under federal regulations on air brakes?
⅛ inch
¼ inch
⅓ inch
½ inch
What is the function of the stop light switch?
The brake light will come on when you press the pedal.
It turns on when your brakes are having issues. You need to repair it before driving again.
It reminds the driver to take a break or rest after a long drive.
Turn it on to prevent the vehicle from rolling away if the parking brakes fail.
When testing for an air leak. You should turn off the engine and hold the brake for 1 minute: after the initial drop, the air pressure should not drop more than ____ psi in one minute.
5
12
3
10
Which of the following are true regarding spring brakes?
The use of air brakes on a long and steep downhill is just to provide extra braking to help the ____.
Braking power of the steering axle.
Braking power of the rear trailer axle
The use of engine braking.
All of the above
Air brakes use ____ to make brakes work.
Nitrogen.
Hydraulic fluid.
Pressurized air.
Hydrogen.
The spring brakes’ braking power is ____.
Does not depend on the state of the service brakes.
Becomes more effective when the service brakes overheat.
Relies on whether or not the service brakes are adjusted properly.
The S-cam drum brakes need air to be introduced into each individual brake chamber before they can be applied. The force of the air pressure pushes the push rod outward which moves the ____, which in turn rotates the ____.
Leaf springs, fifth wheel.
Kingpin : fifth wheel
Slack adjuster : brake camshaft.
The air compressor governor controls ______.
Under federal regulations, large or heavy vehicles are required to have which type of emergency brakes that cannot leak away?
What do parking brakes control?
The brakes when you are driving on flat roads
The brakes when you are driving on hills
It releases the air out of the brake chambers
All of the above
The service brain system makes use of _____.
The parking brakes when the vehicle travels below 15 mph.
The brakes when the driver presses on the foot brake pedal.
The spring brakes in emergency situations.
All of the above.
When the air pressure drops to ______, the tractor spring brakes will come on.
50 to 100 psi.
20 to 45 psi
5 to 15 psi
Below 5 psi
The tractor protection valve ____.
Supplies the braking system with air.
Automatically closes if the air supply falls below a particular threshold.
Can be closed by applying the parking brake.
All of the above.
What will happen if the low air pressure warning signal is not working correctly?
It is “nice to have” feature because you will hear the noise of air leaking out.
In a single circuit air system, it could cause the brakes to stop quickly in an emergency.
The engine may overheat from insufficient air cooling.
None of the above.
The safety valve is programmed to lower pressure automatically at (a) >
Which of the following is the reason why the stopping distance of using air brakes is longer than hydraulic brakes?
Brake lag or delay.
It has less braking force.
The brakes overheat more often with air brakes.
They are the same stopping distance if you press the brake pedal harder with air brakes.
What happens when you press down on the brake pedal?
Pressurized air vents out of the brake chambers.
Pressurized air flows to the brake chambers.
Pressurized air is vented into the atmosphere.
Under what weather conditions are the front-wheel brakes good to use?
Good weather conditions only.
Slippery conditions such as wet or icy road surfaces.
Any weather condition.
Do not use front wheel brakes at all.
The low air warning light and buzzer must come on before the air pressure falls below (a) PSI.
What are the spring brakes?
They are a type of hydraulic brakes which activate when there is a loss of fluids.
If the air brakes lose pressure, the spring brakes will activate to stop the vehicle.
They are a mechanism to help push the brake pedal back to its original position.
They are a type of brakes designed to work more effectively during the spring season.
