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Air Brakes Practice Test

If your truck has a properly functioning dual air brake system and minimum size air tanks, the air pressure should build up from 85 to 100 psi within how many seconds?
The spring brakes used on the chambers in a straight truck will bring you to a stop when air pressure drops below _____ psi.
Some air brake systems have an alcohol evaporator. What may happen if you don't keep the proper level of an alcohol?
The air loss rate for a straight truck or bus with the engine off and the brakes on should not be more than:
The application pressure gauge shows how much air pressure you?
The air compressor stops pumping air at what psi?
Your truck has a dual air system and one of the system loses its pressure. What will happen?
An air brake system is fully charged at what psi?
Your truck or bus has dual air brake system. If a low air pressure warning comes on for only one system, what should you do?
Your truck or bus has a dual brake system. If a low air pressure warning comes on for only one system, what should you do?
A slack adjuster's free play needs to be adjusted if it is more than about _____ how many inches when you pull hard on it?
The most common type of foundation brake found on heavy vehicles is the:
Why drain water from compressed air tanks?
If your truck or bus has dual parking control valves, you can use pressure from a separate tank to:
Repeatedly partially releasing and pressing the brake pedal may result in:
The brake pedal in an air brake system:
Under normal conditions in order to engage the parking brakes driver:
The driver must be able to see a low air pressure warning which comes on before pressure in the service air tanks falls below _______ psi.
If you must make an emergency stop, you should brake so you:
A straight truck or bus air brake system should not leak at the rate of more than _________ psi per minute with the engine off and the brakes released.
The S-cam:
All air brake equipped vehicles have:
If your vehicle has an alcohol evaporator, every day during cold weather you should:
The safety valve is set automatically when pressure is:
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?
The braking power of the spring brakes:
Some air brake systems have an alcohol evaporator. What may happen if you don't keep the proper level of an alcohol?
The brake system that applies and releases the brakes when the driver uses the brake pedal is the ______ system.
The application pressure gauge shows how much air pressure you:
The air brake lag distance at 55 mph on dry pavement adds about ____ feet.
It is accepted that too much heat caused by using your brakes too often can also cause:
The driver must be able to see a low air pressure warning which comes on before pressure in the service air tanks falls below ______ psi.
Total stopping distance for air brakes is longer than that for hydraulic brakes due to _____ distance.
During normal driving, spring brakes are usually held back by:
How should you check that your service brakes are working properly?
Excessive use of the service brakes results in overhearing which can lead to:
Parking or emergency brakes of trucks and buses can be legally held on by __________ pressure.
The spring brakes used on the chambers in a straight truck will bring you to a stop when air pressure drops below _____ psi?