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Commercial Drivers Licence Online Practice Test - Exam 5
Date :
19 / 10 / 2026
Q
1
)
During normal driving, spring brakes are usually held back by:
Spring pressure
Bolts or clamps
Centrifugal force
Air pressure
Q
2
)
What is the purpose of an alcohol evaporator?
So you do not have to drain the air tanks as often.
To have a drink available if you get thirsty.
To reduce the risk of ice in the brake valves and other parts in cold weather.
Q
3
)
To check the free play of manual slack adjusters on s-cam brakes you should?
Park on level ground‚ chock the wheels‚ and release the parking brakes.
Stop on level ground and apply the parking brakes.
Park on level ground and drain off air pressure before adjusting.
Park on a slight grade‚ release the parking brake‚ apply the service brakes‚ and check for vehicle movement.
Q
4
)
Air braking takes more time than hydraulic braking because air brakes:
Need to have airflow through the lines to work.
Use different brake drums.
Require heavier return springs.
All of the above.
Q
5
)
The governor controls when the air compressor will pump into the air storage tanks.
TRUE
FALSE
Dont Know
None of the above
Q
6
)
What is a supply pressure gauge used for?
To tell you how much diesel is in the vehicle.
To tell you how much water is in the air tank.
To tell you how much air is in the air tank.
None of the above
Q
7
)
When driving down a long steep hill you should?
Use stab braking.
Begin braking when you are 10 M.P.H. above your safe speed.
Release the brake when you are 5 M.P.H. below your
Use the trailer brakes.
Q
8
)
If you are away from your vehicle only a short time, you do not need to use the parking brake.
TRUE
FALSE
Dont Know
None of the above
Q
9
)
All vehicles with air brakes must have a low air pressure warning signal.
TRUE
FALSE
Dont Know
None of the above
Q
10
)
If oil and water collect in the air tanks what can happen to the brakes?
The brakes could heat up.
The brakes could fail.
The brakes could lock up.
None of the above
Q
11
)
Your truck or bus has a dual air brake system. If a low air pressure warning comes on for only one system, what should you do?
Reduce your speed and drive to the nearest garage for repairs.
Continue at normal speed and find a garage before the brakes lock.
Reduce your speed and test the remaining system while under way.
Stop. Safely park‚ and continue only after the system is fixed.
Q
12
)
The parking brake applies and releases:
The brake pedal during normal driving.
In the event of an emergency.
The parking brakes when you use the parking brake control.
None of the above
Q
13
)
The air compressor governor controls:
When air is pumped into the air tanks.
Air pressure applied to the brakes.
The speed of the air compressor.
When the brake chambers release pressure.
Q
14
)
The most common type of foundation brakes found on heavy vehicles is the:
Disc brakes
Wedge drum
S-cam drum
None of the above
Q
15
)
Front wheel brakes are good under all conditions.
TRUE
FALSE
Dont Know
None of the above
Q
16
)
What do air brakes use to make the brakes work?
Compressed gas
Compressed oil
Compressed air
None of the above
Q
17
)
The braking power of the spring brakes:
Can only be tested by highly trained brake service people.
Depends on the adjustment of the service brakes.
Increases when the service brakes are hot.
Is not affected by the condition of the service brakes.
Q
18
)
How often should you drain air tanks?
Daily
Weekly
Monthly
None of the above
Q
19
)
Why should you be in the proper gear before starting down a hill?
So you only have to apply the brake just hard enough to feel a definite slowdown.
So you do not have to shift gears going downhill.
So you can go through the gears on the way down.
None of the above
Q
20
)
When you put your brakes on the air brake system works with an electric switch, by air pressure to turn on the brake lights.
TRUE
FALSE
Dont Know
None of the above
Minumum pass for the test is 75%
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Commercial Drivers Licence
Commercial Driver Licence Test 1
Commercial Driver Licence Test 2
Commercial Driver Licence Test 3
Commercial Driver Licence Test 4
Commercial Driver Licence Test 5
Commercial Driver Licence Test 6
Commercial Driver Licence Test 7
Commercial Driver Licence Test 8
