TX CDL Air Brakes 4

Question 1

What activates the stop switch?

Answer 1

Air pressure

Question 2

A straight truck or bus air brake system should not leak at a rate of more than ___ psi per minute with the engine off and the brakes released.

Answer 2

2

Question 3

Vehicles with air brakes must have:

Answer 3

An air pressure gauge to show the pressure available for braking.

Question 4

Slack adjusters should not have more than ______ of play?

Answer 4

1 inch

Question 5

What is the best way to test your vehicle’s low air pressure warning signal?

Answer 5

With the engine off, step on and off the brake pedal to lower the air pressure below 60 psi

Question 6

Which vehicles must have low air pressure warning signals?

Answer 6

All vehicles with air brakes currently in operation must have low air pressure warning signals.

Question 7

To check the slack adjusters on S-cam drum brakes, you should first

Answer 7

park on level ground, chock the wheels, and release the parking brakes.

Question 8

Slack adjusters are:

Answer 8

Between the power screw and push and push rod on disc brakes, a part of the air brake system that is used to adjust the brakes, or between the push rod and S-cam on drum brakes.

Question 9

Air braking takes more time than hydraulic braking because air brakes:

Answer 9

need to have airflow through the lines to work.

Question 10

The tractor protection valve

Answer 10

will close if you apply the parking brakes or automatically if the air supply drops to a certain level, and provides the air supply for the brake system

Question 11

When should you use the parking brake?

Answer 11

Every time you leave your vehicle, with a few exceptions.

Question 12

Different parts of drum brakes on each of your vehicle’s axles:

Answer 12

Axle, slack adjuster, and brake drum (as well as 7 other parts)

Question 13

The safety release valve will blow at ____ psi.

Answer 13

150

Question 14

In an emergency stop you should:

Answer 14

use the stab braking method.