Air Brakes - West Virginia Cdl

1 . 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. Click Here Full Cheat Sheet

2 . Before driving a vehicle with a dual air brake system, you must wait for the air compressor to build a minimum of ____ in both the primary and secondary systems.

25 psi 50 psi 75 psi 100 psi Take a FREE Practice Test Now

3 . When using the controlled braking method in an emergency situation, you should:

Apply the brakes as hard as possible without locking the wheels. Apply the brakes with about half of your usual force. Apply the brakes so the wheels lock. Apply the brakes with minimal pressure. Take a FREE Practice Test Now

4 . When you press the brake pedal in a vehicle with S-cam brakes, air pressure pushes out the rod and moves the:

Slack adjuster. Axle. Brake drum. Alcohol evaporator. Take a FREE Practice Test Now

5 . Spring brakes come on:

When too much air pressure is lost. When a control on the dashboard is activated. When the tires have minimal tread depth. When the brakes are noisy. Click Here Full Cheat Sheet

6 . While driving, spring brakes are generally held in place by:

Air pressure. Chocks. Foundation brakes. Sturdy ties. Take a FREE Practice Test Now

7 . Emergency brakes are:

Not required on trucks. Only required on trailers. Required on tractors. Only required when transporting hazardous materials. Take a FREE Practice Test Now

8 . How is the parking brake released?

By tapping the brake pedal three times By pushing in the brake control knob By starting the vehicle By tapping the accelerator twice Take a FREE Practice Test Now

9 . In a dual air brake system:

Air tanks are shared by both systems. Each system has its own air tanks. You must designate which system you are using. Brakes on only one side of the vehicle will work. Click Here Full Cheat Sheet

10 . What do anti-lock brakes do?

Help a driver avoid wheel lockup Lock up the front wheels Prevent a vehicle from accelerating while traveling uphill Prevent a vehicle from accelerating while traveling downhill Take a FREE Practice Test Now

11 . Brake fading is caused when:

Brakes are not used often enough. Brakes overheat. Brakes are too cold. Brakes are wet. Take a FREE Practice Test Now

12 . Friction inside a brake drum is caused when the brake shoes and linings:

Push against each other. Separate from the axle. Push against the inside of the drum. Create excess heat. Take a FREE Practice Test Now

13 . A tank endorsement is:

Only required when transporting gases. Only required when transporting liquids. Used when transporting both liquids and gases. Optional when transporting hazardous materials. 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 . How many air storage tanks are used in an air brake system?

Two tanks Four tanks Six tanks The number varies. Take a FREE Practice Test Now

15 . A dual air brake system:

Has a single air brake system, but uses two sets of controls. Has one air brake system for each side of the truck. Has two brakes for each wheel. Has two separate air brake systems, but uses a single set of controls. Take a FREE Practice Test Now

16 . How is water and compressor oil removed from the bottom of an air storage tank?

The water and oil are siphoned out of the tank. A drain valve is opened to remove the water and oil from the tank. The water and oil are removed automatically as the brakes are used. A sponge is used to soak up the water and oil. Take a FREE Practice Test Now

17 . Service brakes should:

Be tested once a month. Only be tested by a trained mechanic. Be tested before every trip. Click Here Full Cheat Sheet

18 . In a vehicle with dual parking control valves, once air pressure is lost and the spring brakes come on:

You will be unable to move the vehicle. A separate air tank can be used to release the spring brakes for a short period of time. You can use the spring brakes to continue driving normally. The air tanks will automatically refill to a safe air pressure level. Take a FREE Practice Test Now

19 . Applying the brake pedal causes air pressure to activate an electric switch and:

Turn off the brake lights. Turn on the low pressure warning light. Turn on the brake lights. Turn off the low pressure warning light. Take a FREE Practice Test Now

20 . What is brake lag?

The time required for the brakes to work after the brake pedal is pushed The distance between the brake pedal’s resting position and the floor The amount of air pressure used to stop a vehicle How faded the brakes are Take a FREE Practice Test Now

21 . If the air pressure warning light comes on, you should:

Continue to drive normally. Drive with one foot on the accelerator and one foot on the brake pedal. Call the local law enforcement agency. Safely exit the roadway and stop. Click Here Full Cheat Sheet

22 . Why do you need to drain air tanks regularly?

Because the air gets old and needs to be replaced Because compressed air contains some water which must be drained from the tanks To allow for a change in air pressure To remove bad air from the tanks Take a FREE Practice Test Now

23 . When you need to stop in an emergency, you should:

Lock the wheels and skid to a stop. Stop in a way that keeps your vehicle in a straight line. Stop in a way that turns your vehicle. Expect your vehicle to slow down more quickly than usual. Take a FREE Practice Test Now

24 . The emergency brake system uses:

Only parts of the parking brake system. Only parts of the service brake system. Parts of both the parking and service brake systems. Only parts unique to the emergency brake system. Take a FREE Practice Test Now

25 . What does ABS do?

Prevent wheel lockup Prevent the air compressor from overheating Prevent the front brakes from being used on ice Prevent the brakes from being used if downshifting would be more effective Click Here Full Cheat Sheet