Air Brakes 1

Which of the following is not part of the braking process when you’re driving a tractor-trailer combination vehicle with an anti-lock braking system (ABS)?

• When you slow down, you should monitor your tractor and trailer and ease off the brakes to keep control.

• You should use only the braking necessary to stay safely in control.

• You should drive faster so that you will be able to keep the trailer and tractor straight.

• Brake the same way no matter what you’re driving: a vehicle with ABS, a vehicle with a trailer, or something else.

Slack adjusters are

• A part of the air brake system that is used to adjust the brakes.

• Between the pushrod and S-cam on drum brakes.

• Between the power screw and push rod on disc brakes.

• All the answers are correct

How do brakes work on a long, steep downgrade?

• They work as the main braking mechanism.

• Not applicable; no braking effect is involved in a downgrade.

• They work as a supplement to the braking effect of your engine.

• They work as the main braking mechanism with the engine braking effect as an emergency back up.

When should you drain your air tanks?

• At the end of a trip

• At the end of the month

• At the end of the fiscal quarter

• At the end of each working day

Which of the following should you do before leaving your vehicle unattended?

• Set the parking brakes

• Chock the wheels

• Remove the keys

• All of the answers are correct

Why must you pass a knowledge test on airbrakes?

• All trucks have air brakes.

• Otherwise, you will have to get a CDL with restrictions.

• Otherwise, you will not be able to obtain a CDL at all.

• Otherwise, you will only be able to obtain a commercial learners permit.

What is the best way to test if your vehicle spring brakes come on automatically?

• On single vehicles, continue to step on and off the break pedal and tell the parking brake valve pops out.

• Continue to step on and off the brake pedal until the manufactures low PSI specification is met for spring brakes to deploy.

• On tractor-trailer vehicles, continue to step on and off the brake pedal until the parking brake valve pops out.

• All of the answers are correct

If the air tanks are not drained,

• Your transmission fluid may drain out.

• Your brakes may fail because of water freezing.

• Your left side brake will cease to operate.

• You will drive too quickly.

And antilock braking system (abs)

• Shortens your stopping distance.

• Increases your normal braking capability.

• Decreases your normal braking capability.

• Activates when your wheels are about to lock up.

How can you tell if your vehicle is equipped with an anti-lock braking system (ABS)?

• Check if the vehicle was manufactured after 1998.

• Check if the vehicle was manufactured after 2000.

• ABS is still optional.

• Check if the vehicle was manufactured after 2010.