Air Brakes Endorsement Practice Test – Part 1

Your spring brakes will be automatically applied at no less than

If your vehicle has s-cam drum brakes, what happens when you take your foot off the brake pedal?

What do you have to do to drain your air tanks if you have a manual drain?

What should you do instead of consistently applying your brakes on a steep downgrade?

In s-cam drum brakes, what moves the slack adjuster?

Brakes can fade or fail from excessive heat caused by using them too much and not relying on the engine braking effect.

When you test your parking brakes, you stop your vehicle, apply the parking brake, and gently pull against it while in a lower gear. If your parking brakes are working correctly, your vehicle will..

Which of the following protects the air tank and the entire air brake system from too much pressure?

What is an advantage of a dual-parking control valve?

What is the main advantage of a dual air brake system?

If you have an antilock braking system (ABS) on only the trailer and you start to lose control of your steering, what should you do?

When you apply the brakes as hard as you can without locking the wheels, it’s called

If you’re driving on dry pavement at 55 mph and your vehicle has air brakes, how many feet should you add to your stopping distance?

Which part of the air brake system controls the compressor?

What can happen if the oil and water in your air tank freezes?

Where are brake drums located?

What happens when the air pressure in an air brake system is below 60 psi?

If you’re checking the rate of air pressure buildup in a single air system (pre-1975), in 3 minutes the pressure should build from about 50 psi to

Which of the following is used to keep an air compressor cool?

Why is there a brake lag distance in a vehicle with air brakes?

A slack adjuster needs adjustment if it moves more than

You should brake fully in an emergency situation, if you are driving a

What holds back spring brakes during normal driving?

When you test your service brakes, you should release the parking brake, drive slowly, and then apply the brakes. Which of the following indicates that there may be a problem?

If you have to make an emergency stop, you should brake

Which is an example of stab braking?

What do you have to do each day during cold weather if your air tanks have an automatic drain and an alcohol evaporator?

What should you do if your safety release valve releases air?

What happens to the air pressure when you let up on the brake pedal?

If the pressure in an air brake system has reached the cut-out level, the air compressor won’t be allowed to pump air. In most systems, it will be allowed to pump air again once the pressure reaches a cut-in level of about

In a dual air brake system, the secondary air brake system controls the brakes on