WorksheetsAir Brake Practice Test
Total questions: 24
Worksheet time: 12mins
At what measurement is the safety valve USUALLY set to open
200 PSI
100 PSI
250 PSI
150 PSI
Why must you study air brakes in the state of Idaho?
Otherwise, you cannot receive a CDL at all
Otherwise, you will have to get a CDL with restrictions
All trucks have air brakes in Idaho
Otherwise, you can only receive a CDL permit
When should you drain your air tanks
At the end of your trip
At the end of the month
At the end of the fiscal quarter
At the end of each working day
Which of the following is NOT part of the air brake system?
Radio signal system
Emergency brake system
Parking brake system
Service brake system
Spring brakes are:
Made up of powerful springs, that are held back, while you are driving, by air pressure
Brakes that come on automatically on a truck on a tractor when the PSI drops too low
Not going to have full effect until your PSI drops to a certain range - often 20 to 30 PSI
All of the above
What is the best way to test if your vehicle's spring brakes come on automatically
Continue to step on and off the brake pedal until the parking brake valve pop out on vehicles
Continue to step on and off the brake until the parking brake valve pop out, on tractor trailers vehicles
Continue to step on and off the brake pedal until the manufacturer's low PSI specification have been met for spring brakes to deploy
All of the above
The tractor protection valve
Will close itself automatically if the air supply drops to a certain level
Is closed by the parking brake
Provides your air supply for brake system
All of the above
Which of the following does ABS do
Shortens your stopping distance
Decreases your normal braking capability
Increases your normal braking capability
Activates when the wheels are about to lock up
Which of the following is true about a duel air brake system
One is called the "primary" system and one is called "secondary" system
They use a single set of brake controls
One system usually operates the front axle and one operates the rear axle
All of the above
Which of the following is NOT part of the braking process when driving a tractor-trailer combination vehicle with ABS
Brake the same regardless of what you're driving - whether you have a trailer or ABS, or neither
You should use only the braking necessary to stay safely in control
When you slow down, you should monitor your tractor and trailer and ease off the brakes to keep control
You should drive more quickly so that you will be able to keep the trailer and tractor straight
What is the best way to test your vehicle's low air pressure warning signal?
Manually let the air out of your brakes and see if the signals come on
Pump the brakes until the air pressure drops below 30 PSI
Pump the brakes while your vehicle is fully on
Step on and off the brake pedal, with the engine off, to reduce air pressure below 60 PSI
Which of the following should you do before leaving your vehicle unattended?
Put on the parking brakes
Remove the keys
Chock the wheels
All of the above
The maximum leakage rates per minute are
3 PSI for single vehicles, 4 PSI for combination vehicles
5 PSI for single vehicles, 6 PSI for combination vehicles
5 PSI for single vehicles, 10 PSI for combination vehicles
1 PSI for single vehicles, 3 PSI for comination vehicles
Which of the following is true about your brake function if your ABS fails?
Is will slow your truck to a halt and force you to pull over
It may cause problems with other mechanical systems and there could be a huge fire risk
You will have no brake function and the truck will be out of control
You will still have normal brake function, and simply need to get the ABS repaired soon
Which of the following is NOT part of the drum brake?
Safety valve
Drum brake
Axle
Slack adjuster
How do brakes work on a long, steep downgrade?
Not applicable - there is no braking effect involved in a downgrade
As a supplement to the braking effect of your engine
As the main braking mechanism
As the main braking mechanism, with the engine braking effect as an emergency "back up"
Slack adjusters are
Between the push rod and the S-cam on drub brakes
Part of you air brake system used to adjust the brakes
Between the power screw and push rod on disc brakes
All of the above
How can you tell if your vehicle is equipped with an anti-lock braking system
ABS is still optional
If the vehicle is manufactured after 2010
If the vehicle is manufactured after 1998
If the vehicle is manufactured after 2000
Which conditions are front wheel brakes good under
All weather conditions
Only good weather
Front wheel brakes are never ideal
Only wet or icy conditions
The purpose of a supply pressure gauge is:
To warn you only if there is too little air in the tank
To tell you how hot the air in the tank is
To tell you how much air is in the tank
All of the above
When should you use the parking brake?
Only in urban area, where there are many other vehicles
Only if you are away from your vehicle
Every time you leave your vehicle, except for rare exceptions
Every time you leave your vehicle, for any amount of time
Which of the following is a reason that air tanks must be drained
Your left side brake will cease to operate
Your transmission fluid may drain out
Your brakes may fail due to the water freezing
You will drive too quickly if they are not
How would you check your truck's slack adjusters?
Accelerate, the brake hard
Press the brake pedal while listening for any strange noises
Use gloves and pull hard on each slack adjusters you can reach
All of the above
Which vehicles must have low air pressure warning signals?
Only those built after 2005
All vehicles with air brakes currently in operations
Only those built after 2010
Warning signals are optional
