CDL Air Brakes Test

You should_____when the low pressure warning is activated:

What should you do if the low air pressure warning comes on for only one system in a truck or bus that has a dual air brake system?

You should___when driving down a long steep hill.

When does stab braking occur?

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

Select the true statement about slack adjusters:

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

Select the true statement about tractor protection valve:

Water is drained from the compressed air tanks because:

What does the drain valve for air tanks remove?

When should you not use the parking brakes?

When should you avoid using the parking brake?

The compressor is connected to the engine via _____?

Select the statement that is not part of the air-brake system:

What does the service brake system do?

Select when you should use the parking brake:

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

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

The safety valve is usually set to open at:

Front wheel brakes are good under what kind of conditions?

Commerical vehicles typically have this type of brake.

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

What are spring brakes?

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.

Select the part that is not a part of the drum brake:

When should air tanks be drained?

A slack adjuster is:

The parking brakes should be used____in air brake vehicles.

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

What does the air compressor governor control?

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

Select the true statement about dual air brake systems:

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

Is it mandatory that all vehicles with air brakes have low air pressure warning signals?

What keeps air in the tanks should the air compressor develop a leak?

What does it man when the safety valve releases air?

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

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

How often should air tanks be drained?

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