Air Brake Practice Test

200 PSI

100 PSI

250 PSI

150 PSI

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

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

Radio signal system

Emergency brake system

Parking brake system

Service brake system

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

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

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

Shortens your stopping distance

Decreases your normal braking capability

Increases your normal braking capability

Activates when the wheels are about to lock up

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

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