ID CDL AIR BRAKES TEST ACCURATE
100%
How would you check your truck's slack adjusters?
- 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. - ANSWER - Use gloves and pull hard on each slack
adjuster you can reach
Under which conditions are front wheel brakes good?
- None
- All weather conditions
- Wet or icy conditions only
- Good weather only - ANSWER - All weather conditions
An anti-lock braking system (ABS)
- increases your normal braking capability.
- activates when the wheels are about to lock up.
- decreases your normal braking capability.
- shortens your stopping distance. - ANSWER - activates when the wheels are about to
lock up
What is the best way to test if your vehicle's spring brakes come on automatically?
- On single vehicles, continue to step on and off the brake pedal until the parking brake
valve has popped out.
- On tractor-trailers, continue to step on and off the brake pedal until the parking brake
valve has popped 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. - ANSWER - All of the above are correct
To test whether your vehicle's spring brakes will come on automatically, use the same
method you use for testing the low air pressure warning signal on tractor-trailers and
single vehicles: Step on and off your brake pedal, this time until you reach an even
lower psi reading and the parking brake valve closes or pops out.
Why must you study air brakes in the state of Idaho?
- 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. - ANSWER - Otherwise, you will have to get a
CDL with restricitons
When should you drain your air tanks?
- 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 - ANSWER - At the end of each working day
Which of the following is NOT part of the air brake system?
- Radio signal system
- Parking brake system
- Emergency brake system
- Service brake system - ANSWER - Radio signal system
After the initial drop, the maximum acceptable leakage rates per minute are
- 3 psi for single vehicles and 4 psi for combination vehicles.
- 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. - ANSWER - 3 psi for
single vehicles and 4 psi for combination vehicles
After the initial drop, the maximum acceptable leakage rates per minute are 3 psi for
single vehicles and 4 psi for combination vehicles. If the leakage rate is higher, check
for leaks and correct them.
What is the best way to test your vehicle's low air pressure warning signal?
- 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. - ANSWER -
With the engine off, step on and off the brake pedal to lower the air pressure below 60
psi.
The purpose of a supply pressure gauge is
- 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. - ANSWER - to tell you how much air is in the tank
, Which vehicles must have low air pressure warning signals?
- Only those built after 2010
- Only those built after 2005
- All vehicles with air brakes currently in operation
- None - ANSWER - All vehicles with air brakes currently in operation
Which of the following are true about a dual air brake 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. - ANSWER - All of the above are true.
At what measurement is the safety valve USUALLY set to open?
- 200 psi
- 100 psi
- 250 psi
- 150 psi - ANSWER - 150 psi
How can you tell if your vehicle is equipped with an anti-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. - ANSWER - The vehicle was
manufactured after 1998
Slack adjusters are
- between the push rod and S-cam on drum brakes.
- between the power screw and push rod on disc brakes.
- part of the air brake system that is used to adjust the brakes.
- all of the above. - ANSWER - all of the above
Spring brakes are
- brakes that come on automatically on a truck or tractor when the psi drops too low.
- not going to take full effect until your psi drops to a certain range, typically 20 to 30 psi.
- made up of powerful springs that are held back by air pressure while you are driving.
- all of the above. - ANSWER - all of the above
100%
How would you check your truck's slack adjusters?
- 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. - ANSWER - Use gloves and pull hard on each slack
adjuster you can reach
Under which conditions are front wheel brakes good?
- None
- All weather conditions
- Wet or icy conditions only
- Good weather only - ANSWER - All weather conditions
An anti-lock braking system (ABS)
- increases your normal braking capability.
- activates when the wheels are about to lock up.
- decreases your normal braking capability.
- shortens your stopping distance. - ANSWER - activates when the wheels are about to
lock up
What is the best way to test if your vehicle's spring brakes come on automatically?
- On single vehicles, continue to step on and off the brake pedal until the parking brake
valve has popped out.
- On tractor-trailers, continue to step on and off the brake pedal until the parking brake
valve has popped 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. - ANSWER - All of the above are correct
To test whether your vehicle's spring brakes will come on automatically, use the same
method you use for testing the low air pressure warning signal on tractor-trailers and
single vehicles: Step on and off your brake pedal, this time until you reach an even
lower psi reading and the parking brake valve closes or pops out.
Why must you study air brakes in the state of Idaho?
- 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. - ANSWER - Otherwise, you will have to get a
CDL with restricitons
When should you drain your air tanks?
- 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 - ANSWER - At the end of each working day
Which of the following is NOT part of the air brake system?
- Radio signal system
- Parking brake system
- Emergency brake system
- Service brake system - ANSWER - Radio signal system
After the initial drop, the maximum acceptable leakage rates per minute are
- 3 psi for single vehicles and 4 psi for combination vehicles.
- 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. - ANSWER - 3 psi for
single vehicles and 4 psi for combination vehicles
After the initial drop, the maximum acceptable leakage rates per minute are 3 psi for
single vehicles and 4 psi for combination vehicles. If the leakage rate is higher, check
for leaks and correct them.
What is the best way to test your vehicle's low air pressure warning signal?
- 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. - ANSWER -
With the engine off, step on and off the brake pedal to lower the air pressure below 60
psi.
The purpose of a supply pressure gauge is
- 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. - ANSWER - to tell you how much air is in the tank
, Which vehicles must have low air pressure warning signals?
- Only those built after 2010
- Only those built after 2005
- All vehicles with air brakes currently in operation
- None - ANSWER - All vehicles with air brakes currently in operation
Which of the following are true about a dual air brake 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. - ANSWER - All of the above are true.
At what measurement is the safety valve USUALLY set to open?
- 200 psi
- 100 psi
- 250 psi
- 150 psi - ANSWER - 150 psi
How can you tell if your vehicle is equipped with an anti-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. - ANSWER - The vehicle was
manufactured after 1998
Slack adjusters are
- between the push rod and S-cam on drum brakes.
- between the power screw and push rod on disc brakes.
- part of the air brake system that is used to adjust the brakes.
- all of the above. - ANSWER - all of the above
Spring brakes are
- brakes that come on automatically on a truck or tractor when the psi drops too low.
- not going to take full effect until your psi drops to a certain range, typically 20 to 30 psi.
- made up of powerful springs that are held back by air pressure while you are driving.
- all of the above. - ANSWER - all of the above
