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Kansas CDL Air Brakes Test 1
Practice mode
Question
1
of 25
QUESTION 1 / 25
Vehicles with dual air brake systems:
Choose one answer below.
A
Maintain full-capacity air pressure in the braking systems even when the vehicle is not running.
✓
B
Maintain some air pressure in the braking systems when the vehicle is not running.
✓
C
Must be run to build enough air pressure to brakes to operate properly.
✓
D
Do not need time to build air pressure before a trip.
✓
QUESTION 2 / 25
While driving downhill, you should brake until you reach a speed that is ____ below your safe speed, then release the brake pedal.
Choose one answer below.
A
5 mph
✓
B
10 mph
✓
C
15 mph
✓
D
20 mph
✓
QUESTION 3 / 25
The air pressure in a dual air brake system should build from 85 to 100 psi within:
Choose one answer below.
A
Two minutes.
✓
B
15 seconds.
✓
C
10 minutes.
✓
D
45 seconds.
✓
QUESTION 4 / 25
When traveling down a steep downgrade:
Choose one answer below.
A
The air brakes should be used.
✓
B
Shift into a lower gear, then use brakes to supplement the braking effect of the engine.
✓
C
The vehicle should be continually downshifted in the place of using the brakes.
✓
D
The vehicle should be driven on the shoulder.
✓
QUESTION 5 / 25
How is the parking brake released?
Choose one answer below.
A
By tapping on the brake pedal three times
✓
B
By pushing in the brake control knob
✓
C
By engaging the accelerator
✓
D
By tapping the accelerator twice
✓
QUESTION 6 / 25
During an applied leakage test, the maximum leakage rate for a triple combination vehicle is:
Choose one answer below.
A
10 psi in a minute.
✓
B
8 psi in a minute.
✓
C
6 psi in a minute.
✓
D
4 psi in a minute.
✓
QUESTION 7 / 25
Applying the brake pedal causes air pressure to activate an electric switch and:
Choose one answer below.
A
Turn off the brake lights.
✓
B
Turn on the low pressure warning light.
✓
C
Turn on the brake lights.
✓
D
Turn off the low pressure warning light.
✓
QUESTION 8 / 25
How should you test the low pressure warning signal?
Choose one answer below.
A
Engage and disable the parking brake.
✓
B
Rapidly press and release the brake pedal.
✓
C
Open the rear shut-off valves.
✓
D
Uncouple and recouple all glad hands.
✓
QUESTION 9 / 25
A modulating control valve can control the:
Choose one answer below.
A
Spring brakes.
✓
B
Landing gear.
✓
C
Air brakes.
✓
D
Anti-lock braking system (ABS).
✓
QUESTION 10 / 25
Both systems in a dual air brake systems share:
Choose one answer below.
A
Air tanks.
✓
B
Hoses.
✓
C
Air lines.
✓
D
An air compressor.
✓
QUESTION 11 / 25
What do anti-lock brakes do?
Choose one answer below.
A
Help a driver avoid wheel lockup
✓
B
Lock up the front wheels
✓
C
Prevent a vehicle from accelerating while traveling uphill
✓
D
Prevent a vehicle from accelerating while traveling downhill
✓
QUESTION 12 / 25
On trucks and buses, where are ABS malfunction lamps located?
Choose one answer below.
A
On the driver’s door
✓
B
On the instrument panel
✓
C
On the outside of the vehicle by the passenger’s door
✓
D
Under the hood
✓
QUESTION 13 / 25
All air tanks must include:
Choose one answer below.
A
A drain valve.
✓
B
A lock.
✓
C
A trap door.
✓
D
A warning sticker.
✓
QUESTION 14 / 25
What color are ABS malfunction lamps?
Choose one answer below.
A
Orange
✓
B
Yellow
✓
C
Green
✓
D
Blue
✓
QUESTION 15 / 25
Before driving a vehicle with air brakes, you should ensure that the spring brakes come on automatically when:
Choose one answer below.
A
Air pressure falls below 45 psi.
✓
B
Air pressure falls below 20 psi.
✓
C
Driving downhill.
✓
D
Driving uphill.
✓
QUESTION 16 / 25
What is a wig wag?
Choose one answer below.
A
A type of warning system
✓
B
A tube used to move air from the compressor to the tanks
✓
C
A noise made by air brakes when used
✓
D
A part within the braking unit that allows air to move freely
✓
QUESTION 17 / 25
Before starting down a hill, be sure to:
Choose one answer below.
A
Accelerate.
✓
B
Switch into a high gear.
✓
C
Sound your horn.
✓
D
Switch into a low gear.
✓
QUESTION 18 / 25
A dual air brake system:
Choose one answer below.
A
Has a single air brake system, but uses two sets of controls.
✓
B
Has one air brake system for each side of the truck.
✓
C
Has two brakes for each wheel.
✓
D
Has two separate air brake systems, but uses a single set of controls.
✓
QUESTION 19 / 25
Front brake limiting valves were intended to:
Choose one answer below.
A
Prevent the front tires from skidding.
✓
B
Prevent the front tires from overheating.
✓
C
Create equal brake usage.
✓
D
Remove uncertainty when applying the brakes.
✓
QUESTION 20 / 25
Test the low pressure warning signal:
Choose one answer below.
A
Once a month.
✓
B
Once a week.
✓
C
Twice a week.
✓
D
Before every trip.
✓
QUESTION 21 / 25
Brakes may get out of adjustment:
Choose one answer below.
A
If they are too hot.
✓
B
In colder weather.
✓
C
If they are used.
✓
D
If they get wet.
✓
QUESTION 22 / 25
Most heavy-duty vehicles use:
Choose one answer below.
A
Single air brake systems.
✓
B
Dual air brake systems.
✓
C
Triple air brake systems.
✓
D
Quadruple air brake systems.
✓
QUESTION 23 / 25
A vehicle equipped with an Anti-Lock Braking System (ABS) uses a ____ light to warn that the system is not working properly.
Choose one answer below.
A
Green
✓
B
Yellow
✓
C
Orange
✓
D
White
✓
QUESTION 24 / 25
Which of the following is not a part of an air brake system?
Choose one answer below.
A
A service brake system
✓
B
A parking brake system
✓
C
An emergency brake system
✓
D
An axle brake system
✓
QUESTION 25 / 25
If the spring brakes are activated, you should never:
Choose one answer below.
A
Push down the brake pedal.
✓
B
Open the hood.
✓
C
Release air from the air storage tanks.
✓
D
Open the door to the cab.
✓
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