Air Brakes #2 - Ohio Cdl

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

Green Blue Yellow Click Here Full Cheat Sheet

2 . Friction in an S-cam brake is caused when the brake shoes and linings:

Press against the outside of the brake drum. Press against the inside of the brake drum. Push against each other. Take a FREE Practice Test Now

3 . When leaving your vehicle unattended:

The parking brake should be used. The parking brake only needs to be used if the vehicle is parked on a slope. The parking brake should not be used, as it can damage the tires. Take a FREE Practice Test Now

4 . A low air pressure warning signal should activate:

When tank pressure falls below 120 psi. When tank pressure falls below 60 psi. When tank pressure falls below 10 psi. When tank pressure falls below 5 psi. Take a FREE Practice Test Now

5 . Why do large vehicles use air brakes?

Other brake systems squeak too loudly. Air brakes are very effective systems. Other braking systems are hard to come by. Click Here Full Cheat Sheet

6 . What is brake lag?

The time required for the brakes to work after the brake pedal is pressed The distance between the brake pedal and the floor The amount of air pressure used to stop the vehicle Take a FREE Practice Test Now

7 . 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

8 . While driving, ____ generally holds spring brakes in place.

Air pressure Electricity Gasoline Take a FREE Practice Test Now

9 . What is removed when an air tank is drained?

Water and oil Ammonia Liquid cleaners Click Here Full Cheat Sheet

10 . A slack adjuster should move no more than ____ from where it is attached to the push rod.

Two inches Five inches One inch Take a FREE Practice Test Now

11 . You should ____ if the low pressure warning signal activates while you are driving.

Stop where you are and park Exit the roadway as soon as safely possible Continue driving normally Take a FREE Practice Test Now

12 . An application pressure gauge shows:

How much air pressure is being applied to the brakes. How much air pressure is available. How much air pressure is required to stop a vehicle. Take a FREE Practice Test Now

13 . Air tank drains:

Should not be used in cold weather. Are helpful to remove water and oil from the air tanks. Are used to move air to the brakes. 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 . What does an air compressor do in an air brake system?

It pumps air into the air storage tanks. It fills the tires. It moves air to the back of the truck. Take a FREE Practice Test Now

15 . In a vehicle with dual parking control valves, a separate air tank can be used:

To make the air brakes work more effectively. To temporarily release the spring brakes. To charge the brakes on the rear trailer. Take a FREE Practice Test Now

16 . Failing to drain air tanks could result in:

Water accumulations freezing and causing brake failure. Squishy brakes. Too much air collecting in the tanks. Take a FREE Practice Test Now

17 . Before driving a vehicle with air brakes, you should ensure that the ____ come on automatically when air pressure falls below 45 psi.

Spring brakes Parking brakes Air brakes Click Here Full Cheat Sheet

18 . 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

19 . What helps prevent wheel lockup when braking?

An Anti-Lock Braking System (ABS) Air brakes An alternator Take a FREE Practice Test Now

20 . What should happen before the air pressure in an air brake system tank falls below 55 psi?

The warning light should activate. The vehicle will be unable to shift out of gear. The front lights should flash. Take a FREE Practice Test Now

21 . Brakes can get out of adjustment quickly, especially:

If they are hot. In the winter time. If they are used frequently. Click Here Full Cheat Sheet

22 . If using spring brakes when hauling a heavy load, a complete stop will:

Be impossible. Take a long time. Take a short amount of time. Take a FREE Practice Test Now

23 . What do air brakes use to make the brakes work?

Compressed air Outside air Non-compressed air Take a FREE Practice Test Now

24 . 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

25 . The rods in S-cam brakes move the slack adjusters when air pressure is added to the brake chambers. This air pressure is added to the chambers when the driver:

Presses the brake pedal. Uses the emergency brake. Uses the trailer hand valve. Click Here Full Cheat Sheet