Air Brakes #2 - North Carolina Cdl

1 . To confirm that a trailer has ABS, you can:

Look under the trailer for wheel speed sensors coming from the back of the brakes. Look under the hood for the ABS sticker. Look at the tires. Remove a tire and look for the ABS sensor on the axle. Click Here Full Cheat Sheet

2 . The air pressure in a dual air brake system should build from 85 to 100 psi within:

Two minutes. 15 seconds. 10 minutes. 45 seconds. Take a FREE Practice Test Now

3 . A wig wag is:

A low pressure warning device. A tube that carries air to the brakes. A type of air brake system. Take a FREE Practice Test Now

4 . An emergency brake must be controlled by:

Mechanical force. Air pressure. Gravity. Take a FREE Practice Test Now

5 . Brake fading is caused when:

Brakes are not used often enough. Brakes overheat. Brakes are too cold. Brakes are wet. Click Here Full Cheat Sheet

6 . Which of the following is not a part of an air brake system?

A service brake system A parking brake system An emergency brake system An axle brake system Take a FREE Practice Test Now

7 . During an applied leakage test, the maximum leakage rate for a double combination vehicle is ____ in a minute.

2 psi 4 psi 6 psi Take a FREE Practice Test Now

8 . The most common type of foundation brake used is the:

S-cam drum brake. C-cam drum brake. G-cam disc brake. P-cam disc brake. Take a FREE Practice Test Now

9 . Where is the safety relief valve usually located?

Near the rear brake Near the front brake In an air tank On the dashboard Click Here Full Cheat Sheet

10 . When traveling down a steep downgrade:

The air brakes should be used. The vehicle should be placed in a low gear and the driver should use engine braking. The driver should continually downshift instead of using the brakes. Take a FREE Practice Test Now

11 . Failing to drain the tanks in an air brake system can result in:

Water freezing and causing brake failure. Squishy brakes. Too much air collecting. Too much fuel being carried. Take a FREE Practice Test Now

12 . You should test the low pressure warning signal by:

Turning on the engine and applying the trailer hand brake. Rapidly pressing and releasing the brake pedal. Removing wheel chocks and disengaging the parking brake. Take a FREE Practice Test Now

13 . If the safety relief valve in the air brake system releases air:

The compressor needs more air. The air pressure has become too high. The brakes are fully operational. Click Here Full Cheat Sheet

Study tip: Reduce your study time from hours to minutes with a DMV exam “Cheat Sheet” 99.2% of people who use the cheat sheet pass the FIRST TIME Click Here Full Cheat Sheet

14 . Before starting down a hill, be sure to:

Accelerate. Switch into a high gear. Sound your horn. Switch into a low gear. Take a FREE Practice Test Now

15 . Vehicles equipped with Anti-Lock Braking Systems (ABS) have ____ malfunction lamps to indicate when the ABS is not working.

Green Blue Yellow Take a FREE Practice Test Now

16 . During an applied leakage test, the maximum leakage rate for a double combination vehicle is:

10 psi in a minute. 8 psi in a minute. 6 psi in a minute. 4 psi in a minute. Take a FREE Practice Test Now

17 . Most heavy-duty vehicles use:

Single air brake systems. Dual air brake systems. Triple air brake systems. Quadruple air brake systems. Click Here Full Cheat Sheet

18 . Some air brake systems use alcohol:

To reduce the risk of ice forming in air brake valves. To make the compressor run more efficiently. To lubricate parts of the braking system. To reduce the risk of rust forming on air brake valves. Take a FREE Practice Test Now

19 . What kind of brakes do most newer heavy-duty trucks use?

Single air brakes Dual air brakes Triple air brakes Take a FREE Practice Test Now

20 . Pressing and releasing a brake pedal unnecessarily can:

Release air faster than it can be replaced. Add more air to the braking system. Make the brake pedal more sensitive. Create a loud noise. Take a FREE Practice Test Now

21 . What is often found in compressed air?

Water Cardboard Brake fluid Click Here Full Cheat Sheet

22 . If the low pressure warning light comes on while you are driving:

Braking will only occur if there is enough air in the tanks. You can brake 14 times before the air in the system runs out. You should continue to drive normally and check the brake system when it is convenient. You should continue driving, but turn the emergency flashers on to warn other motorists. Take a FREE Practice Test Now

23 . During an applied leakage test, the maximum leakage rate for a single vehicle with air brakes is:

3 psi in one minute. 6 psi in one minute. 8 psi in one minute. 4 psi in one minute. Take a FREE Practice Test Now

24 . If the low air pressure warning signal comes on in a vehicle with air brakes, the driver should:

Test the brakes while driving, but continue driving if nothing seems wrong. Immediately stop driving. Drive with the hazard lights activated. Take a FREE Practice Test Now

25 . What do the two systems of a dual air brake system share?

Hoses An air compressor Air tanks Click Here Full Cheat Sheet