CDL Air Brakes Test

Air brake systems should not lose air faster than____when testing for air leakage rates in combination vehicles before applying the brake pedal.

Select the answer that is not a part of the braking process when driving a tractor-trailer combination vehicle that has ABS:

The 3 parts of the air brake system are: service brakes, parking brakes, and ____.

The method used to make sure the spring brakes will come on automatically is to:

Select the true statement in regards to an application pressure gauge:

Select the reason as to why air tanks need to be drained:

Select the inappropriate way to test for the low pressure warning signal.

Select how you can tell if your vehicle is equipped with an anti-lock braking system:

You should____to check the free play of manual slack adjusters on S-Cam brakes.

When should you drain air tanks that do not have an automatic tank drain?

How often should air tanks be drained?

When should air tanks be drained?

Alcohol evaporators in some air brake systems help to:

What are spring brakes?

You should_____when checking the slack adjusters on S-Cam brakes.

Select when you should use the parking brake:

Air tanks should be drained:

Select the true statement in regards to the braking power of spring brakes.

The parking brakes should be used____in air brake vehicles.

Should the air pressure in the service air tanks fall below____the driver must be alerted via warning mechanism in the truck cab.

When should you avoid using the parking brake?

With the engine cutt off and the brakes released the air loss in a straight truck or bus should not be more than:

What must vehicles with air brakes have?

Is this statement true or false: you do not need to use the parking brake if are leaving your vehicle for a short amount of time.

How do you know when your brakes are fading?

____is what can legally hold the parking brake or emergency brake in position for a bus, truck, or truck tractor.

____is the most common type of foundation brakes used by heavy vehicles.

How do you check the air compressor governor "cut in" and "cut out" pressures?

Why do air brakes take longer to stop than hydraulic brakes?

Select the true statement about tractor protection valve:

You should_____when the low pressure warning is activated:

Select the true statement about dual air brake systems:

The best way to test if the spring brakes come on automatically is to:

Select the factor that is known to cause brakes to fail or fade. (more than one answer may be correct, but select only one)

Select what you should do before leaving the vehicle unattended:

Select which vehicles are required to have a low air pressure warning signal:

The best way to describe a dual air brake system is:

What is a supply pressure gauge used for?

The compressor is connected to the engine via _____?

When does stab braking occur?