Air Brakes - Pennsylvania Cdl

1 . What kind of force must emergency brakes use?

Air pressure Mechanical Heavy Electrical Click Here Full Cheat Sheet

2 . 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

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

Continue driving normally. Activate your hazard lights and continue driving. Call the local law enforcement agency. Safely exit the roadway and stop. Take a FREE Practice Test Now

4 . If the brake pads rub against the brake drums and create too much heat:

The brakes will stick. The brakes will become extra sensitive. The brakes may stop working. The air compressor will kick on to cool the brakes. Take a FREE Practice Test Now

5 . In cold weather, an alcohol evaporator should be checked and filled:

Once a week. Every day. Every hour. Once a month. Click Here Full Cheat Sheet

6 . What does the air compressor governor do?

Controls when the air compressor pumps air into the air storage tanks. Controls how quickly air leaves the air storage tanks. Controls the temperature of the air entering the air storage tanks. Controls the temperature of the air leaving the air storage tanks. Take a FREE Practice Test Now

7 . When only the tractor is equipped with an Anti-Lock Braking System (ABS):

There is a decreased risk of jackknifing. There is an increased risk of jackknifing. The brakes will not work as effectively as they would without ABS. The brakes will become more sensitive. Take a FREE Practice Test Now

8 . Before a vehicle with dual air brakes is driven, pressure of at least ____ should be built up in both braking systems.

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

9 . What happens if the air pressure in a system's air tanks falls below 60 psi?

A warning light will come on. The vehicle will not shift out of gear. The front lights will flash. The vehicle should stop. Click Here Full Cheat Sheet

10 . 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

11 . 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

12 . What can happen if the air pressure gets too low in an air brake system?

The brakes may squeak. The brakes may not work. The brakes may be sluggish. The brakes will be very sensitive. Take a FREE Practice Test Now

13 . The ____ tells a driver how much pressure is in the air tanks.

Application pressure gauge Air compressor governor Supply pressure gauge Drum brake 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 . When the brake pedal is pushed down, air brakes work:

Immediately. After a short delay. After about a minute. Only if it is warm outside. Take a FREE Practice Test Now

15 . Service brakes should:

Be tested once a month. Only be tested by a trained mechanic. Be tested before every trip. Take a FREE Practice Test Now

16 . 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

17 . 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. Click Here Full Cheat Sheet

18 . How is the parking brake released?

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

19 . To stop in a vehicle that uses air brakes, the driver should:

Pull the air brake lever. Engage the brake lever. Push the brake pedal down. Pull the brake pedal up. Take a FREE Practice Test Now

20 . If braking at a speed of 55 mph while driving on dry pavement, the brake lag can add ____ to your vehicle's total stopping distance.

32 feet 15 feet 50 feet 10 feet Take a FREE Practice Test Now

21 . The air storage tanks:

Hold only enough air for one braking cycle. Hold enough air for brakes to be used several times if the compressor stops working. Do not hold air unless there is an emergency. Hold enough air for more than 1,000 braking cycles. Click Here Full Cheat Sheet

22 . Vehicles with dual air brake systems:

Maintain full-capacity air pressure in the braking systems even when the vehicle is not running. Maintain some air pressure in the braking systems when the vehicle is not running. Must be run to build enough air pressure to brakes to operate properly. Do not need time to build air pressure before a trip. Take a FREE Practice Test Now

23 . 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

24 . Where is the safety relief valve usually located?

Near the rear brake Near the front brake In an air tank On the dashboard Take a FREE Practice Test Now

25 . 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. Click Here Full Cheat Sheet