Air Brake Practice Test

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