CDL Air Brakes Test

Air pressure should build___with a dual air system.

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

The safety valve is usually set to open at:

Select how you would check the truck's slack adjusters.

When does stab braking occur?

Select the true statement about emergency brakes:

Select the true statement about tractor protection valve:

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

Select the true statement about dual air brake systems.

Select the true statement in regards to brake drums:

You should___when driving down a long steep hill.

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

What is the purpose of the supply pressure gauge?

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

The parking brakes should be used____in air brake vehicles.

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

An example of a low pressure warning signal for air brakes is:

Air tanks should be drained:

You should_____when the low pressure warning is activated:

Select how brakes work on long, steep downgrades:

When does your vehicle's single brake system need an adjustment?

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

The best way to test the low air pressure warning signal is to:

A leak rate for a straight truck or bus air brake system should not exceed _____psi per minute when the engine is off and the brakes are released.

Commerical vehicles typically have this type of brake.

Select the true statement about what the Air Compressor Governor controls:

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

Should your air compressor stop working:

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

What are spring brakes?

Select the true statement in regards to your brake function when your ABS fails

When should you not use the parking brakes?

Select the factors that can cause your brakes to fade or fail:

Select the true statement about dual air brake systems:

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

An air system that is fully charged will typically have ___ psi of pressure.

You should brake on a long steep downgrade hill as a supplement to the braking effects of the engine

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

After the initial drop, the maximum leakage rates per minute is:

Select the first action to do when the low air pressure warning comes on: