1 . 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

2 . Once the air tanks are at an air pressure level of 125 psi, the air compressor governor will:

Stop the compressor from pumping air.
Release air from the tanks.
Begin pumping air into the tanks.
Take a FREE Practice Test Now

3 . In a dual air brake system, if one air system is very low on pressure:

None of the brakes will work at all.
Either the front or rear brakes will not be fully operable.
There is usually no noticeable effect.
Take a FREE Practice Test Now

4 . Air brakes use ____ to function.

Compressed air
Liquid air
Nitrogen
Take a FREE Practice Test Now

5 . Manual air tank drains should be:

Opened to drain the tanks after each day.
Left open while driving.
Sealed with glue.
Click Here
Full Cheat Sheet

6 . In a dual air brake system, air pressure should build from 85 to 100 psi within ____ seconds.

25
10
45
Take a FREE Practice Test Now

7 . When operating a vehicle with a dual air brake system, the driver should:

Let the vehicle warm up before driving to ensure that the fuel reaches the engine.
Let the air compressor build up a minimum of 100 psi pressure in the primary and secondary systems before driving.
Begin driving just after the vehicle starts.
Take a FREE Practice Test Now

8 . What color light indicates a vehicle's ABS is not working?

Green
Blue
Yellow
Take a FREE Practice Test Now

9 . 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
Click Here
Full Cheat Sheet

10 . 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.
Take a FREE Practice Test Now

11 . An alcohol evaporator is especially important:

In cold weather.
In hot weather.
In dry weather.
Take a FREE Practice Test Now

12 . Air tank drains should:

Only be used by mechanics.
Only be used when it is wet outside.
Be used to drain the tanks completely.
Take a FREE Practice Test Now

13 . While operating on a downgrade, you should brake until you reach a speed that is:

5 mph below your safe speed.
10 mph below your safe speed.
15 mph below your safe speed.
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 leaving your vehicle unattended:

The parking brake must be always be used.
The parking brake should never be used.
Windows in the cab should be lowered.
Take a FREE Practice Test Now

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

The compressor needs more air.
There is something wrong with the brakes.
You may continue driving.
Take a FREE Practice Test Now

16 . Some water and compressor oil is usually found in the compressed air within an air brake system. The water and compressor oil:

Are necessary for the proper function of the system.
Should take up about 10 percent of the tank.
Should be removed regularly.
Take a FREE Practice Test Now

17 . 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

18 . The leakage rate for a triple combination vehicle with air brakes should be no more than ____ in one minute during a static leakage test.

8 psi
5 psi
3 psi
Take a FREE Practice Test Now

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

Water and oil
Ammonia
Liquid cleaners
Take a FREE Practice Test Now

20 . Brakes out of adjustment will:

Work properly.
Cause some of the brakes to overwork and malfunction.
Allow better acceleration.
Take a FREE Practice Test Now

21 . Lights that indicate that anti-lock brakes are not working are:

Gray.
Blue.
Yellow.
Click Here
Full Cheat Sheet

22 . If the spring brakes are on, you should:

Not use the brake pedal.
Press the accelerator.
Move the steering wheel.
Take a FREE Practice Test Now

23 . 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.
Take a FREE Practice Test Now

24 . When parked on a flat surface, you should:

Use wheel chocks to prevent your vehicle from moving.
Not use wheel chocks.
Use wheel chocks, but only if you have applied the parking brake.
Take a FREE Practice Test Now

25 . If the safety relief valve in an air brake system is releasing air:

You should not be concerned as this is a normal process.
There is something wrong with the brakes.
The valve is operational.
Click Here
Full Cheat Sheet