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Commercial Drivers Licence Online Practice Test - Exam 4

Date :  19 / 08 / 2017
        
Q1
The air storage tanks are used to hold compressed air.




Q2
Modern air brake systems combines three different systems. The are the service brakes, the parking brakes and the:




Q3
What can you check to see if the spring brakes come on automatically?




Q4
You should know that your brakes are fading when:




Q5
The S-cam forces the brake shoes away from one another and presses them against the inside of the brake drum. It is called the S-cam because:




Q6
To make an emergency stop with air brakes, using the stab braking method, you should:




Q7
In air brake vehicles, the parking brakes should be used:




Q8
The use of brakes on a long steep downgrade is only a supplement to the braking effect of the engine.




Q9
Of the choices below, the first thing to do when a low air pressure warning comes on is:




Q10
What is another name for controlled braking?




Q11
The brake system that applies and releases the brakes when the driver uses the brake pedal is the:




Q12
If you must make an emergency stop, you should brake so that you:




Q13
The application pressure gauge shows the driver how much pressure:




Q14
What factors can cause brakes to fade or fail?




Q15
If your vehicle has an alcohol evaporator, every day during cold weather you should:




Q16
The service brake applies and releases:




Q17
The brake pedal in an air brake system:




Q18
Why drain water from the compressed air tanks?




Q19
What can legally hold a parking or emergency brake in position for a truck, truck tractor or bus?




Q20
What are the maximum leakage rates?




Minumum pass for the test is 75%
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Commercial Drivers Licence

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