ID CDL Air Brakes Test | Questions and answers |
2025/2026 | Instant Download !!
How would you check your truck's slack adjusters? - Use gloves and pull hard on each slack adjuster you can reach
- Accelerate and then brake hard.
- Press the brake pedal while listening for any
strange noises.
- Use gloves and pull hard on each slack adjuster you
can reach.
- All of the above are correct.
Under which conditions are front wheel brakes good? - All weather conditions
- None
- All weather conditions
- Wet or icy conditions only
- Good weather only
An anti-lock braking system (ABS) - activates when the wheels are about to lock up
- increases your normal braking capability.
- activates when the wheels are about to lock up.
- decreases your normal braking capability.
- shortens your stopping distance.
,What is the best way to test if your vehicle's spring brakes - All of the above are
correct come on automatically?
- On single vehicles, continue to step on and off the To test whether your vehicle's spring brakes will come on automatically, use
the brake pedal until the parking brake valve has popped out. same method you use for testing the low air pressure warning signal on tractor-
- On tractor-trailers, continue to step on and off the brake trailers and single vehicles: Step on and off your brake pedal, this time
until you pedal until the parking brake valve has popped out. reach an even lower psi reading and the parking brake valve closes or
pops out.
- Continue to step on and off the brake pedal until
the manufacturer's low psi specification has been
met for spring brakes to deploy.
- All of the above are correct.
Why must you study air brakes in the state of Idaho? - Otherwise, you will have to get a CDL with restricitons
- Otherwise, you will only be able to receive a CDL
permit.
- Otherwise, you will have to get a CDL with restrictions.
- Otherwise, you will not be able to get a CDL at all.
- All trucks have air brakes in Idaho.
When should you drain your air tanks? - At the end of each working day
- At the end of a trip
- At the end of the fiscal quarter
- At the end of each working day
- At the end of the month
Which of the following is NOT part of the air brake - Radio signal system
system?
- Radio signal system
- Parking brake system
- Emergency brake system
- Service brake system
After the initial drop, the maximum acceptable leakage - 3 psi for single vehicles and 4 psi for combination
vehicles rates per minute are
After the initial drop, the maximum acceptable leakage rates per minute are 3 psi
- 3 psi for single vehicles and 4 psi for combination for single vehicles and 4 psi for combination vehicles. If the leakage rate is
higher, vehicles. check for leaks and correct them.
- 5 psi for single vehicles and 10 psi for
combination vehicles.
- 1 psi for single vehicles and 3 psi for
combination vehicles.
- 5 psi for single vehicles and 6 psi for
combination vehicles.
, What is the best way to test your vehicle's low air pressure - With the engine off, step on and off the brake pedal to lower the air
pressure warning signal? below 60 psi.
- Pump the brakes until the air pressure drops below
30 psi.
- Pump the brakes while your vehicle is fully on.
- With the engine off, step on and off the brake pedal
to lower the air pressure below 60 psi.
- Manually let the air out of your brakes and see if
the signal comes on.
The purpose of a supply pressure gauge is - to tell you how much air is in the tank
- to tell you how much air is in the tank.
- to warn you only if there is too little air in the tank.
- to tell you how hot the air in the tank is.
- all of the above.
Which vehicles must have low air pressure warning - All vehicles with air brakes currently in
operation signals?
- Only those built after 2010
- Only those built after 2005
- All vehicles with air brakes currently in operation
- None
Which of the following are true about a dual air brake - All of the above are true.
system?
- Usually, one system operates the front axle and
one operates the rear axle.
- It uses a single set of brake controls.
- One system is called the "primary" system and the
other one is called the "secondary" system.
- All of the above are true.
At what measurement is the safety valve USUALLY set to -
150 psi open?
- 200 psi
- 100 psi
- 250 psi
- 150 psi
How can you tell if your vehicle is equipped with an anti- - The vehicle was manufactured after
1998 lock braking system (ABS)?
- The vehicle was manufactured after 1998.
- ABS is still optional.
- The vehicle was manufactured after 2010.
- The vehicle was manufactured after 2000.
2025/2026 | Instant Download !!
How would you check your truck's slack adjusters? - Use gloves and pull hard on each slack adjuster you can reach
- Accelerate and then brake hard.
- Press the brake pedal while listening for any
strange noises.
- Use gloves and pull hard on each slack adjuster you
can reach.
- All of the above are correct.
Under which conditions are front wheel brakes good? - All weather conditions
- None
- All weather conditions
- Wet or icy conditions only
- Good weather only
An anti-lock braking system (ABS) - activates when the wheels are about to lock up
- increases your normal braking capability.
- activates when the wheels are about to lock up.
- decreases your normal braking capability.
- shortens your stopping distance.
,What is the best way to test if your vehicle's spring brakes - All of the above are
correct come on automatically?
- On single vehicles, continue to step on and off the To test whether your vehicle's spring brakes will come on automatically, use
the brake pedal until the parking brake valve has popped out. same method you use for testing the low air pressure warning signal on tractor-
- On tractor-trailers, continue to step on and off the brake trailers and single vehicles: Step on and off your brake pedal, this time
until you pedal until the parking brake valve has popped out. reach an even lower psi reading and the parking brake valve closes or
pops out.
- Continue to step on and off the brake pedal until
the manufacturer's low psi specification has been
met for spring brakes to deploy.
- All of the above are correct.
Why must you study air brakes in the state of Idaho? - Otherwise, you will have to get a CDL with restricitons
- Otherwise, you will only be able to receive a CDL
permit.
- Otherwise, you will have to get a CDL with restrictions.
- Otherwise, you will not be able to get a CDL at all.
- All trucks have air brakes in Idaho.
When should you drain your air tanks? - At the end of each working day
- At the end of a trip
- At the end of the fiscal quarter
- At the end of each working day
- At the end of the month
Which of the following is NOT part of the air brake - Radio signal system
system?
- Radio signal system
- Parking brake system
- Emergency brake system
- Service brake system
After the initial drop, the maximum acceptable leakage - 3 psi for single vehicles and 4 psi for combination
vehicles rates per minute are
After the initial drop, the maximum acceptable leakage rates per minute are 3 psi
- 3 psi for single vehicles and 4 psi for combination for single vehicles and 4 psi for combination vehicles. If the leakage rate is
higher, vehicles. check for leaks and correct them.
- 5 psi for single vehicles and 10 psi for
combination vehicles.
- 1 psi for single vehicles and 3 psi for
combination vehicles.
- 5 psi for single vehicles and 6 psi for
combination vehicles.
, What is the best way to test your vehicle's low air pressure - With the engine off, step on and off the brake pedal to lower the air
pressure warning signal? below 60 psi.
- Pump the brakes until the air pressure drops below
30 psi.
- Pump the brakes while your vehicle is fully on.
- With the engine off, step on and off the brake pedal
to lower the air pressure below 60 psi.
- Manually let the air out of your brakes and see if
the signal comes on.
The purpose of a supply pressure gauge is - to tell you how much air is in the tank
- to tell you how much air is in the tank.
- to warn you only if there is too little air in the tank.
- to tell you how hot the air in the tank is.
- all of the above.
Which vehicles must have low air pressure warning - All vehicles with air brakes currently in
operation signals?
- Only those built after 2010
- Only those built after 2005
- All vehicles with air brakes currently in operation
- None
Which of the following are true about a dual air brake - All of the above are true.
system?
- Usually, one system operates the front axle and
one operates the rear axle.
- It uses a single set of brake controls.
- One system is called the "primary" system and the
other one is called the "secondary" system.
- All of the above are true.
At what measurement is the safety valve USUALLY set to -
150 psi open?
- 200 psi
- 100 psi
- 250 psi
- 150 psi
How can you tell if your vehicle is equipped with an anti- - The vehicle was manufactured after
1998 lock braking system (ABS)?
- The vehicle was manufactured after 1998.
- ABS is still optional.
- The vehicle was manufactured after 2010.
- The vehicle was manufactured after 2000.
